diff --git a/.github/workflows/check-all-lint-rule-diffs.yaml b/.github/workflows/check-all-lint-rule-diffs.yaml
index 4b200b4..fdaead9 100644
--- a/.github/workflows/check-all-lint-rule-diffs.yaml
+++ b/.github/workflows/check-all-lint-rule-diffs.yaml
@@ -2,8 +2,6 @@ name: Check all lint rule diffs
 
 on:
   workflow_dispatch:
-  schedule:
-    - cron:  '0 0 15 * *'
 
 env:
   branch: "update-all-lint-rules"
diff --git a/.github/workflows/update-all-lint-rules.yaml b/.github/workflows/update-all-lint-rules.yaml
new file mode 100644
index 0000000..a299d6a
--- /dev/null
+++ b/.github/workflows/update-all-lint-rules.yaml
@@ -0,0 +1,73 @@
+name: Update all lint rules
+
+on:
+  schedule:
+    - cron:  '0 0 * * 3'
+  workflow_dispatch:
+
+env:
+  branch: "update-all-lint-rules"
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    outputs:
+      has_diff: ${{ steps.output.outputs.has_diff }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dart-lang/setup-dart@v1
+      - name: run
+        working-directory: ./packages/diffscrape
+        run: dart run diffscrape
+      - name: output diff
+        id: output
+        run: echo "diff_count=$(git diff --name-only --relative=packages/altive_lints/lib | wc -l)" >> "$GITHUB_ENV"
+      - name: Create branch
+        if: env.diff_count != '0'
+        run: |
+          git switch -c ${{ env.branch }}
+          git push origin ${{ env.branch }}
+      - name: Git config
+        if: env.diff_count != '0'
+        run: |
+          git remote set-url origin https://github-actions:${GH_TOKEN}@github.com/${GITHUB_REPOSITORY}
+          git config --global user.name "${GITHUB_ACTOR}"
+          git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+      - name: Commit & Push
+        if: env.diff_count != '0'
+        run: |
+          git add .
+          git commit -m "feat: update all_lint_rules"
+          git push origin ${{ env.branch }}
+      - name: Output flag
+        run: echo "has_diff=${{ env.diff_count != '0' }}" >> "$GITHUB_OUTPUT"
+
+  pull-request:
+    name: Create Pull-Request
+    runs-on: ubuntu-latest
+    needs: [update]
+    if: ${{ needs.diff.outputs.has_diff == 'true' }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Generate GiHub App token
+        id: generate_token
+        uses: actions/create-github-app-token@v1
+        with:
+          app_id: ${{ secrets.PR_WRITER_APP_ID }}
+          private_key: ${{ secrets.PR_WRITER_PRIVATE_KEY }}
+
+      - name: Create PR
+        env:
+          GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}
+        run: gh pr create -B $GITHUB_REF -t ${{ env.branch }} -b "" -a $GITHUB_ACTOR -H ${{ env.branch }}
+
+      - name: Revoke GitHub Apps token
+        env:
+          GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}
+        run: |
+          curl --location --silent --request DELETE \
+            --url "${GITHUB_API_URL}/installation/token" \
+            --header "Accept: application/vnd.github+json" \
+            --header "X-GitHub-Api-Version: 2022-11-28" \
+            --header "Authorization: Bearer ${GITHUB_TOKEN}"
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..6ee3768
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,24 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "diffscrape",
+            "cwd": "packages/diffscrape",
+            "request": "launch",
+            "type": "dart",
+            "args": [
+                "diffscrape",
+                "--uri",
+                "https://dart.dev/tools/linter-rules/all",
+                "--file",
+                "../altive_lints/lib/all_lint_rules.yaml",
+                "--query-selector",
+                "pre code.yaml",
+                "--verbose"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 294a0cc..d0da4fe 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -8,7 +8,16 @@
         "gocolly",
         "interps",
         "ints",
+        "pubspec",
+        "redeclares",
         "tearoffs",
-        "todos"
-    ]
+        "todos",
+        "unawaited",
+        "writeln"
+    ],
+    "yaml.schemas": {
+        "https://json.schemastore.org/yamllint.json": [
+            "*.yaml",
+        ]
+    }
 }
\ No newline at end of file
diff --git a/packages/diffscrape/.gitignore b/packages/diffscrape/.gitignore
new file mode 100644
index 0000000..3a85790
--- /dev/null
+++ b/packages/diffscrape/.gitignore
@@ -0,0 +1,3 @@
+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/
diff --git a/packages/diffscrape/CHANGELOG.md b/packages/diffscrape/CHANGELOG.md
new file mode 100644
index 0000000..b78d64c
--- /dev/null
+++ b/packages/diffscrape/CHANGELOG.md
@@ -0,0 +1,3 @@
+## 0.0.1
+
+- Initial version.
diff --git a/packages/diffscrape/README.md b/packages/diffscrape/README.md
new file mode 100644
index 0000000..8bdd5ec
--- /dev/null
+++ b/packages/diffscrape/README.md
@@ -0,0 +1,26 @@
+# Diffscrape
+
+## What is it?
+
+Diffscrape is a tool for scraping web and file diffs.
+
+## Interface
+
+### uri
+URL of the scraping destination.
+
+### file
+Files to be compared. Any differences will be overwritten.
+
+### query-selector
+Selector for searching elements in HTML.
+
+A sample command-line application providing basic argument parsing with an entrypoint in `bin/`.
+
+```shell
+dart run diffscrape \
+--uri "https://dart.dev/tools/linter-rules/all" \
+--file "../altive_lints/lib/all_lint_rules.yaml" \
+--query-selector "pre code.yaml" \
+--verbose
+```
diff --git a/packages/diffscrape/analysis_options.yaml b/packages/diffscrape/analysis_options.yaml
new file mode 100644
index 0000000..1e27888
--- /dev/null
+++ b/packages/diffscrape/analysis_options.yaml
@@ -0,0 +1,5 @@
+include: package:altive_lints/altive_lints.yaml
+
+linter:
+  rules:
+    - avoid_print: false
diff --git a/packages/diffscrape/bin/diffscrape.dart b/packages/diffscrape/bin/diffscrape.dart
new file mode 100644
index 0000000..219610e
--- /dev/null
+++ b/packages/diffscrape/bin/diffscrape.dart
@@ -0,0 +1,42 @@
+import 'package:args/args.dart';
+import 'package:diffscrape/diffscrape.dart';
+import 'package:diffscrape/src/arg.dart';
+import 'package:diffscrape/src/util.dart';
+
+const String version = '0.0.1';
+
+void main(List<String> arguments) {
+  final argParser = buildParser();
+  final ArgResults results;
+  try {
+    results = argParser.parse(arguments);
+  } on FormatException catch (e) {
+    // Print usage information if an invalid argument was provided.
+    print(e.message);
+    print('');
+    printUsage(argParser);
+    return;
+  }
+
+  if (results.wasParsed('help')) {
+    printUsage(argParser);
+    return;
+  }
+  if (results.wasParsed('version')) {
+    print('diffscrape version: $version');
+    return;
+  }
+
+  final verbose = results.wasParsed('verbose');
+
+  print('Positional arguments: ${results.rest}');
+  if (verbose) {
+    print('[VERBOSE] All arguments: ${results.arguments}');
+  }
+  scrape(
+    uriPath: results[argUri] as String,
+    filePath: results[argFile] as String,
+    querySelector: results[argQuerySelector] as String,
+    verbose: verbose,
+  );
+}
diff --git a/packages/diffscrape/lib/diffscrape.dart b/packages/diffscrape/lib/diffscrape.dart
new file mode 100644
index 0000000..a52cb4c
--- /dev/null
+++ b/packages/diffscrape/lib/diffscrape.dart
@@ -0,0 +1,103 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:html/parser.dart';
+import 'package:http/http.dart' as http;
+
+typedef Diff = Set<String>;
+typedef Diffs = ({Diff inserts, Diff deletes});
+const noDiff = (inserts: <String>{}, deletes: <String>{});
+
+/// [uriPath] のURLをスクレイピングして [filePath] のファイルと差分あれば、
+/// そのファイルをスクレイピングした内容で上書きする。
+///
+/// [uriPath] は、スクレイピング先のURLパス。
+/// [filePath] は、スクレイピング結果と比較し上書きしたいファイルのパス。
+/// [querySelector] は、スクレイピング先のHTMLのクエリセレクタ。
+/// [verbose] は、詳細な出力をするかどうか。
+Future<Diffs> scrape({
+  required String uriPath,
+  required String filePath,
+  required String querySelector,
+  required bool verbose,
+}) async {
+  final uri = Uri.tryParse(uriPath);
+  if (uri == null) {
+    stderr.writeln('Invalid URI: $uriPath');
+    exit(1);
+  }
+  if (!await FileSystemEntity.isFile(filePath)) {
+    stderr.writeln('Invalid file path: $filePath');
+    exit(1);
+  }
+  final file = File(filePath);
+
+  final oldSets = await _readFile(file, verbose);
+
+  final newRulesText = await _scrape(
+    uri: uri,
+    querySelector: querySelector,
+    verbose: verbose,
+  );
+  final newSets = newRulesText.split('\n').toSet();
+
+  if (oldSets == newSets) {
+    print('No diff.');
+    return noDiff;
+  }
+
+  final inserts = oldSets.difference(newSets);
+  print('inserts length: ${inserts.length}');
+  if (verbose && inserts.isNotEmpty) {
+    print('[VERBOSE] inserts: $inserts');
+  }
+  final deletes = newSets.difference(oldSets);
+  print('deletes length: ${deletes.length}');
+  if (verbose && deletes.isNotEmpty) {
+    print('[VERBOSE] deletes: $deletes');
+  }
+
+  await _writeToFile(file, newRulesText);
+
+  return (inserts: inserts, deletes: deletes);
+}
+
+Future<Diff> _readFile(File file, bool verbose) async {
+  final lines = utf8.decoder.bind(file.openRead()).transform(LineSplitter());
+  final set = <String>{};
+  await for (final line in lines) {
+    set.add(line);
+  }
+  if (verbose) {
+    print('[VERBOSE] oldValue: $set');
+  }
+  return set;
+}
+
+Future<String> _scrape({
+  required Uri uri,
+  required String querySelector,
+  required bool verbose,
+}) async {
+  // scraping HTML.
+  final response = await http.get(uri);
+  if (response.statusCode != 200) {
+    stderr.writeln('Failed to get HTML: ${response.statusCode}');
+    exit(1);
+  }
+  final document = parse(response.body);
+
+  final element = document.querySelectorAll(querySelector).firstOrNull?.text;
+  if (element == null) {
+    stderr.writeln('No elements found.');
+    exit(1);
+  }
+  if (verbose) {
+    print('[VERBOSE] scraped element: $element');
+  }
+  return element;
+}
+
+Future<void> _writeToFile(File file, String value) async {
+  await file.writeAsString('$value\n', mode: FileMode.writeOnly);
+}
diff --git a/packages/diffscrape/lib/src/arg.dart b/packages/diffscrape/lib/src/arg.dart
new file mode 100644
index 0000000..e35573e
--- /dev/null
+++ b/packages/diffscrape/lib/src/arg.dart
@@ -0,0 +1,51 @@
+import 'package:args/args.dart';
+
+const argUri = 'uri';
+const argFile = 'file';
+const argQuerySelector = 'query-selector';
+const argFilteringPrefix = 'filtering-prefix';
+
+ArgParser buildParser() {
+  return ArgParser()
+    ..addOption(
+      argUri,
+      abbr: 'u',
+      mandatory: true,
+      help: 'URI to scrape.',
+    )
+    ..addOption(
+      argFile,
+      abbr: 'f',
+      mandatory: true,
+      help: 'Path to the file to compare against.',
+    )
+    ..addOption(
+      argQuerySelector,
+      abbr: 'q',
+      mandatory: true,
+      help: 'HTML query selector for the result.',
+    )
+    ..addOption(
+      argFilteringPrefix,
+      abbr: 'p',
+      help: 'Filtering prefix for the result.',
+    )
+    // common flags.
+    ..addFlag(
+      'help',
+      abbr: 'h',
+      negatable: false,
+      help: 'Print this usage information.',
+    )
+    ..addFlag(
+      'verbose',
+      abbr: 'v',
+      negatable: false,
+      help: 'Show additional command output.',
+    )
+    ..addFlag(
+      'version',
+      negatable: false,
+      help: 'Print the tool version.',
+    );
+}
diff --git a/packages/diffscrape/lib/src/util.dart b/packages/diffscrape/lib/src/util.dart
new file mode 100644
index 0000000..e59caf5
--- /dev/null
+++ b/packages/diffscrape/lib/src/util.dart
@@ -0,0 +1,6 @@
+import 'package:args/args.dart';
+
+void printUsage(ArgParser argParser) {
+  print('Usage: dart diffscrape.dart <flags> [arguments]');
+  print(argParser.usage);
+}
diff --git a/packages/diffscrape/pubspec.lock b/packages/diffscrape/pubspec.lock
new file mode 100644
index 0000000..b13b316
--- /dev/null
+++ b/packages/diffscrape/pubspec.lock
@@ -0,0 +1,405 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: "36a321c3d2cbe01cbcb3540a87b8843846e0206df3e691fa7b23e19e78de6d49"
+      url: "https://pub.dev"
+    source: hosted
+    version: "65.0.0"
+  altive_lints:
+    dependency: "direct dev"
+    description:
+      name: altive_lints
+      sha256: ba89baff059dd26160d8299a35de6e9ab3455c24d963c2b8bcf927628dfc4e2a
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: dfe03b90ec022450e22513b5e5ca1f01c0c01de9c3fba2f7fd233cb57a6b9a07
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.0"
+  args:
+    dependency: "direct main"
+    description:
+      name: args
+      sha256: eef6c46b622e0494a36c5a12d10d77fb4e855501a91c1b9ef9339326e58f0596
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.2"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.11.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.18.0"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "8acabb8306b57a409bf4c83522065672ee13179297a6bb0cb9ead73948df7c76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.7.2"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
+  csslib:
+    dependency: transitive
+    description:
+      name: csslib
+      sha256: "706b5707578e0c1b4b7550f64078f0a0f19dec3f50a178ffae7006b0a9ca58fb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: "5fc22d7c25582e38ad9a8515372cd9a93834027aacf1801cf01164dac0ffa08c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: "408e3ca148b31c20282ad6f37ebfa6f4bdc8fede5b74bc2f08d9d92b55db3612"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: "0e7014b3b7d4dac1ca4d6114f82bf1782ee86745b9b42a92c9289c23d8a0ab63"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  html:
+    dependency: "direct main"
+    description:
+      name: html
+      sha256: "3a7812d5bcd2894edf53dfaf8cd640876cf6cef50a8f238745c8b8120ea74d3a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.15.4"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      sha256: d4872660c46d929f6b8a9ef4e7a7eff7e49bbf0c4ec3f385ee32df5119175139
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: "97486f20f9c2f7be8f514851703d0119c3596d14ea63227af6f7a481ef2b2f8b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.2"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: "2ec25704aba361659e10e3e5f5d672068d332fc8ac516421d483a11e5cbd061e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.7"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: d2323aa2060500f906aa31a895b4030b6da3ebdcc5619d14ce1aada65cd161cb
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.16+1"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: e4ff8e8564c03f255408decd16e7899da1733852a9110a58fe6d1b817684a63e
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: "1c5b77ccc91e4823a5af61ee74e6b972db1ef98c2ff5a18d3161c982a55448bd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.0"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.1"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "40d3ab1bbd474c4c2328c91e3a7df8c6dd629b79ece4c4bd04bee496a224fb0c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: ad29c505aee705f41a4d8963641f91ac4cee3c8fad5947e033390a7bd8180fa4
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: a41d3f53c4adf0f57480578c1d61d90342cd617de7fc8077b1304643c2d85c1e
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "9ca081be41c60190ebcb4766b2486a7d50261db7bd0f5d9615f2d653637a84c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: "84cf769ad83aa6bb61e0aa5a18e53aea683395f196a6f39c4c881fb90ed4f7ae"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "708b3f6b97248e5781f493b765c3337db11c5d2c81c3094f10904bfa8004c703"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.12"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      sha256: "3d028996109ad5c253674c7f347822fb994a087614d6f353e6039704b4661ff2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.25.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "9955ae474176f7ac8ee4e989dadfb411a58c30415bcfb648fa04b2b8a03afa7f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.0"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: "2bc4b4ecddd75309300d8096f781c0e3280ca1ef85beda558d33fcbedc2eead4"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.0"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.2"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: a2662fb1f114f4296cf3f5a50786a2d888268d7776cf681aa17d660ffa23b246
+      url: "https://pub.dev"
+    source: hosted
+    version: "14.0.0"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: "3d2ad6751b3c16cf07c7fca317a1413b3f26530319181b37e3b9039b84fc01d8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: edc8a9573dd8c5a83a183dae1af2b6fd4131377404706ca4e5420474784906fa
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.0"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      sha256: "045ec2137c27bf1a32e6ffa0e734d532a6677bf9016a0d1a406c54e499ff945b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "87d3f2333bb240704cd3f1c6b5b7acd8a10e7f0bc28c28dcf14e782014f4a572"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: "75769501ea3489fca56601ff33454fe45507ea3bfb014161abc3b43ae25989d5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+sdks:
+  dart: ">=3.2.3 <4.0.0"
diff --git a/packages/diffscrape/pubspec.yaml b/packages/diffscrape/pubspec.yaml
new file mode 100644
index 0000000..00d2ecf
--- /dev/null
+++ b/packages/diffscrape/pubspec.yaml
@@ -0,0 +1,17 @@
+name: diffscrape
+description: A sample command-line application with basic argument parsing.
+version: 0.0.1
+publish_to: none
+repository: https://github.com/altive/altive_lints
+
+environment:
+  sdk: ^3.2.3
+
+dependencies:
+  args: ^2.4.2
+  html: ^0.15.4
+  http: ^1.1.2
+
+dev_dependencies:
+  altive_lints: ^1.9.0
+  test: ^1.24.0
diff --git a/packages/diffscrape/test/data/deleted_rules.yaml b/packages/diffscrape/test/data/deleted_rules.yaml
new file mode 100644
index 0000000..40187e0
--- /dev/null
+++ b/packages/diffscrape/test/data/deleted_rules.yaml
@@ -0,0 +1,218 @@
+linter:
+  rules:
+    - always_put_control_body_on_new_line
+    - always_put_required_named_parameters_first
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    - always_use_package_imports
+    - annotate_overrides
+    - annotate_redeclares
+    - avoid_annotating_with_dynamic
+    - avoid_bool_literals_in_conditional_expressions
+    - avoid_catches_without_on_clauses
+    - avoid_catching_errors
+    - avoid_classes_with_only_static_members
+    - avoid_double_and_int_checks
+    - avoid_dynamic_calls
+    - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
+    - avoid_escaping_inner_quotes
+    - avoid_field_initializers_in_const_classes
+    - avoid_final_parameters
+    - avoid_function_literals_in_foreach_calls
+    - avoid_implementing_value_types
+    - avoid_init_to_null
+    - avoid_js_rounded_ints
+    - avoid_multiple_declarations_per_line
+    - avoid_null_checks_in_equality_operators
+    - avoid_positional_boolean_parameters
+    - avoid_print
+    - avoid_private_typedef_functions
+    - avoid_redundant_argument_values
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    - avoid_returning_null
+    - avoid_returning_null_for_future
+    - avoid_returning_null_for_void
+    - avoid_returning_this
+    - avoid_setters_without_getters
+    - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_type_to_string
+    - avoid_types_on_closure_parameters
+    - avoid_unnecessary_containers
+    - avoid_unstable_final_fields
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    - avoid_web_libraries_in_flutter
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    - cascade_invocations
+    - cast_nullable_to_non_nullable
+    - close_sinks
+    - collection_methods_unrelated_type
+    - combinators_ordering
+    - comment_references
+    - conditional_uri_does_not_exist
+    - constant_identifier_names
+    - control_flow_in_finally
+    - curly_braces_in_flow_control_structures
+    - dangling_library_doc_comments
+    - depend_on_referenced_packages
+    - deprecated_consistency
+    - deprecated_member_use_from_same_package
+    - diagnostic_describe_all_properties
+    - directives_ordering
+    - discarded_futures
+    - do_not_use_environment
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    - eol_at_end_of_file
+    - exhaustive_cases
+    - file_names
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    - implicit_call_tearoffs
+    - implicit_reopen
+    - invalid_case_patterns
+    - iterable_contains_unrelated_type
+    - join_return_with_assignment
+    - leading_newlines_in_multiline_strings
+    - library_annotations
+    - library_names
+    - library_prefixes
+    - library_private_types_in_public_api
+    - lines_longer_than_80_chars
+    - list_remove_unrelated_type
+    - literal_only_boolean_expressions
+    - matching_super_parameters
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    - no_default_cases
+    - no_duplicate_case_values
+    - no_leading_underscores_for_library_prefixes
+    - no_leading_underscores_for_local_identifiers
+    - no_literal_bool_comparisons
+    - no_logic_in_create_state
+    - no_self_assignments
+    - no_wildcard_variable_uses
+    - non_constant_identifier_names
+    - noop_primitive_operations
+    - null_check_on_nullable_type_parameter
+    - null_closures
+    - omit_local_variable_types
+    - one_member_abstracts
+    - only_throw_errors
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    - parameter_assignments
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    - prefer_asserts_with_message
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    - prefer_constructors_over_static_methods
+    - prefer_contains
+    - prefer_double_quotes
+    - prefer_expression_function_bodies
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_final_parameters
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    - prefer_function_declarations_over_variables
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    - prefer_int_literals
+    - prefer_interpolation_to_compose_strings
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    - prefer_mixin
+    - prefer_null_aware_method_calls
+    - prefer_null_aware_operators
+    - prefer_relative_imports
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
+    - public_member_api_docs
+    - recursive_getters
+    - require_trailing_commas
+    - secure_pubspec_urls
+    - sized_box_for_whitespace
+    - sized_box_shrink_expand
+    - slash_for_doc_comments
+    - sort_child_properties_last
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    - tighten_type_of_initializing_formals
+    - type_annotate_public_apis
+    - type_init_formals
+    - type_literal_in_constant_pattern
+    - unawaited_futures
+    - unnecessary_await_in_return
+    - unnecessary_brace_in_string_interps
+    - unnecessary_breaks
+    - unnecessary_const
+    - unnecessary_constructor_name
+    - unnecessary_final
+    - unnecessary_getters_setters
+    - unnecessary_lambdas
+    - unnecessary_late
+    - unnecessary_library_directive
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_raw_strings
+    - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unnecessary_to_list_in_spreads
+    - unreachable_from_main
+    - unrelated_type_equality_checks
+    - unsafe_html
+    - use_build_context_synchronously
+    - use_colored_box
+    - use_decorated_box
+    - use_enums
+    - use_full_hex_values_for_flutter_colors
+    - use_function_type_syntax_for_parameters
+    - use_if_null_to_convert_nulls_to_bools
+    - use_is_even_rather_than_modulo
+    - use_key_in_widget_constructors
+    - use_late_for_private_fields_and_variables
+    - use_named_constants
+    - use_rethrow_when_possible
+    - use_setters_to_change_properties
+    - use_string_buffers
+    - use_string_in_part_of_directives
+    - use_super_parameters
+    - use_test_throws_matchers
+    - use_to_and_as_if_applicable
+    - valid_regexps
diff --git a/packages/diffscrape/test/data/inserted_and_deleted_rules.yaml b/packages/diffscrape/test/data/inserted_and_deleted_rules.yaml
new file mode 100644
index 0000000..3fed595
--- /dev/null
+++ b/packages/diffscrape/test/data/inserted_and_deleted_rules.yaml
@@ -0,0 +1,224 @@
+linter:
+  rules:
+    - aa_dummy_rule
+    - always_put_control_body_on_new_line
+    - always_put_required_named_parameters_first
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    - always_use_package_imports
+    - annotate_overrides
+    - annotate_redeclares
+    - avoid_annotating_with_dynamic
+    - avoid_bool_literals_in_conditional_expressions
+    - avoid_catches_without_on_clauses
+    - avoid_catching_errors
+    - avoid_double_and_int_checks
+    - avoid_dynamic_calls
+    - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
+    - avoid_escaping_inner_quotes
+    - avoid_field_initializers_in_const_classes
+    - avoid_final_parameters
+    - avoid_function_literals_in_foreach_calls
+    - avoid_implementing_value_types
+    - avoid_init_to_null
+    - avoid_js_rounded_ints
+    - avoid_multiple_declarations_per_line
+    - avoid_null_checks_in_equality_operators
+    - avoid_positional_boolean_parameters
+    - avoid_print
+    - avoid_private_typedef_functions
+    - avoid_redundant_argument_values
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_returning_null
+    - avoid_returning_null_for_future
+    - avoid_returning_null_for_void
+    - avoid_returning_this
+    - avoid_setters_without_getters
+    - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_type_to_string
+    - avoid_types_as_parameter_names
+    - avoid_types_on_closure_parameters
+    - avoid_unnecessary_containers
+    - avoid_unstable_final_fields
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    - avoid_web_libraries_in_flutter
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    - cascade_invocations
+    - cast_nullable_to_non_nullable
+    - close_sinks
+    - collection_methods_unrelated_type
+    - combinators_ordering
+    - comment_references
+    - conditional_uri_does_not_exist
+    - constant_identifier_names
+    - control_flow_in_finally
+    - cp_dummy_rule
+    - cq_dummy_rule
+    - curly_braces_in_flow_control_structures
+    - dangling_library_doc_comments
+    - depend_on_referenced_packages
+    - deprecated_consistency
+    - deprecated_member_use_from_same_package
+    - diagnostic_describe_all_properties
+    - directives_ordering
+    - discarded_futures
+    - do_not_use_environment
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    - eol_at_end_of_file
+    - exhaustive_cases
+    - file_names
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    - implicit_call_tearoffs
+    - implicit_reopen
+    - invalid_case_patterns
+    - iterable_contains_unrelated_type
+    - join_return_with_assignment
+    - leading_newlines_in_multiline_strings
+    - library_annotations
+    - library_names
+    - library_prefixes
+    - library_private_types_in_public_api
+    - lines_longer_than_80_chars
+    - list_remove_unrelated_type
+    - literal_only_boolean_expressions
+    - matching_super_parameters
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    - no_default_cases
+    - no_leading_underscores_for_local_identifiers
+    - no_literal_bool_comparisons
+    - no_logic_in_create_state
+    - no_runtimeType_toString
+    - no_self_assignments
+    - no_wildcard_variable_uses
+    - non_constant_identifier_names
+    - noop_primitive_operations
+    - null_check_on_nullable_type_parameter
+    - null_closures
+    - omit_local_variable_types
+    - one_member_abstracts
+    - only_throw_errors
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    - parameter_assignments
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    - prefer_asserts_with_message
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    - prefer_constructors_over_static_methods
+    - prefer_contains
+    - prefer_double_quotes
+    - prefer_expression_function_bodies
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_final_parameters
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    - prefer_function_declarations_over_variables
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    - prefer_int_literals
+    - prefer_interpolation_to_compose_strings
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    - prefer_mixin
+    - prefer_null_aware_method_calls
+    - prefer_null_aware_operators
+    - prefer_relative_imports
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
+    - public_member_api_docs
+    - recursive_getters
+    - require_trailing_commas
+    - secure_pubspec_urls
+    - sized_box_for_whitespace
+    - sized_box_shrink_expand
+    - slash_for_doc_comments
+    - sort_child_properties_last
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    - tighten_type_of_initializing_formals
+    - type_annotate_public_apis
+    - type_init_formals
+    - type_literal_in_constant_pattern
+    - unawaited_futures
+    - unnecessary_await_in_return
+    - unnecessary_brace_in_string_interps
+    - unnecessary_breaks
+    - unnecessary_const
+    - unnecessary_constructor_name
+    - unnecessary_final
+    - unnecessary_getters_setters
+    - unnecessary_lambdas
+    - unnecessary_late
+    - unnecessary_library_directive
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_checks
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_raw_strings
+    - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unnecessary_to_list_in_spreads
+    - unreachable_from_main
+    - unrelated_type_equality_checks
+    - unsafe_html
+    - use_build_context_synchronously
+    - use_colored_box
+    - use_decorated_box
+    - use_enums
+    - use_full_hex_values_for_flutter_colors
+    - use_function_type_syntax_for_parameters
+    - use_if_null_to_convert_nulls_to_bools
+    - use_is_even_rather_than_modulo
+    - use_key_in_widget_constructors
+    - use_late_for_private_fields_and_variables
+    - use_named_constants
+    - use_raw_strings
+    - use_rethrow_when_possible
+    - use_string_buffers
+    - use_string_in_part_of_directives
+    - use_super_parameters
+    - use_test_throws_matchers
+    - use_to_and_as_if_applicable
+    - valid_regexps
+    - void_checks
+    - vw_dummy_rule
+    - vx_dummy_rule
+    - vy_dummy_rule
diff --git a/packages/diffscrape/test/data/inserted_rules.yaml b/packages/diffscrape/test/data/inserted_rules.yaml
new file mode 100644
index 0000000..7ecadb8
--- /dev/null
+++ b/packages/diffscrape/test/data/inserted_rules.yaml
@@ -0,0 +1,231 @@
+linter:
+  rules:
+    - aa_dummy_rule
+    - ab_dummy_rule
+    - always_declare_return_types
+    - always_put_control_body_on_new_line
+    - always_put_required_named_parameters_first
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    - always_use_package_imports
+    - annotate_overrides
+    - annotate_redeclares
+    - avoid_annotating_with_dynamic
+    - avoid_bool_literals_in_conditional_expressions
+    - avoid_catches_without_on_clauses
+    - avoid_catching_errors
+    - avoid_classes_with_only_static_members
+    - avoid_double_and_int_checks
+    - avoid_dynamic_calls
+    - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
+    - avoid_escaping_inner_quotes
+    - avoid_field_initializers_in_const_classes
+    - avoid_final_parameters
+    - avoid_function_literals_in_foreach_calls
+    - avoid_implementing_value_types
+    - avoid_init_to_null
+    - avoid_js_rounded_ints
+    - avoid_multiple_declarations_per_line
+    - avoid_null_checks_in_equality_operators
+    - avoid_positional_boolean_parameters
+    - avoid_print
+    - avoid_private_typedef_functions
+    - avoid_redundant_argument_values
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    - avoid_returning_null
+    - avoid_returning_null_for_future
+    - avoid_returning_null_for_void
+    - avoid_returning_this
+    - avoid_setters_without_getters
+    - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_type_to_string
+    - avoid_types_as_parameter_names
+    - avoid_types_on_closure_parameters
+    - avoid_unnecessary_containers
+    - avoid_unstable_final_fields
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    - avoid_web_libraries_in_flutter
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    - cascade_invocations
+    - cast_nullable_to_non_nullable
+    - close_sinks
+    - collection_methods_unrelated_type
+    - combinators_ordering
+    - comment_references
+    - conditional_uri_does_not_exist
+    - constant_identifier_names
+    - control_flow_in_finally
+    - curly_braces_in_flow_control_structures
+    - dangling_library_doc_comments
+    - depend_on_referenced_packages
+    - deprecated_consistency
+    - deprecated_member_use_from_same_package
+    - diagnostic_describe_all_properties
+    - directives_ordering
+    - discarded_futures
+    - do_not_use_environment
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    - eol_at_end_of_file
+    - exhaustive_cases
+    - file_names
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    - implicit_call_tearoffs
+    - implicit_reopen
+    - invalid_case_patterns
+    - iterable_contains_unrelated_type
+    - join_return_with_assignment
+    - leading_newlines_in_multiline_strings
+    - library_annotations
+    - library_names
+    - library_prefixes
+    - library_private_types_in_public_api
+    - lines_longer_than_80_chars
+    - list_remove_unrelated_type
+    - literal_only_boolean_expressions
+    - matching_super_parameters
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    - no_default_cases
+    - no_duplicate_case_values
+    - no_leading_underscores_for_library_prefixes
+    - no_leading_underscores_for_local_identifiers
+    - no_literal_bool_comparisons
+    - no_logic_in_create_state
+    - no_runtimeType_toString
+    - no_self_assignments
+    - no_wildcard_variable_uses
+    - non_constant_identifier_names
+    - noop_primitive_operations
+    - null_check_on_nullable_type_parameter
+    - null_closures
+    - omit_local_variable_types
+    - one_member_abstracts
+    - only_throw_errors
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    - parameter_assignments
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    - prefer_asserts_with_message
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    - prefer_constructors_over_static_methods
+    - prefer_contains
+    - prefer_double_quotes
+    - prefer_expression_function_bodies
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_final_parameters
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    - prefer_function_declarations_over_variables
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    - prefer_int_literals
+    - prefer_interpolation_to_compose_strings
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    - prefer_mixin
+    - prefer_null_aware_method_calls
+    - prefer_null_aware_operators
+    - prefer_relative_imports
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
+    - public_member_api_docs
+    - qa_dummy_rule
+    - qb_dummy_rule
+    - recursive_getters
+    - require_trailing_commas
+    - secure_pubspec_urls
+    - sized_box_for_whitespace
+    - sized_box_shrink_expand
+    - slash_for_doc_comments
+    - sort_child_properties_last
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    - tighten_type_of_initializing_formals
+    - type_annotate_public_apis
+    - type_init_formals
+    - type_literal_in_constant_pattern
+    - unawaited_futures
+    - unnecessary_await_in_return
+    - unnecessary_brace_in_string_interps
+    - unnecessary_breaks
+    - unnecessary_const
+    - unnecessary_constructor_name
+    - unnecessary_final
+    - unnecessary_getters_setters
+    - unnecessary_lambdas
+    - unnecessary_late
+    - unnecessary_library_directive
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_aware_operator_on_extension_on_nullable
+    - unnecessary_null_checks
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_raw_strings
+    - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unnecessary_to_list_in_spreads
+    - unreachable_from_main
+    - unrelated_type_equality_checks
+    - unsafe_html
+    - use_build_context_synchronously
+    - use_colored_box
+    - use_decorated_box
+    - use_enums
+    - use_full_hex_values_for_flutter_colors
+    - use_function_type_syntax_for_parameters
+    - use_if_null_to_convert_nulls_to_bools
+    - use_is_even_rather_than_modulo
+    - use_key_in_widget_constructors
+    - use_late_for_private_fields_and_variables
+    - use_named_constants
+    - use_raw_strings
+    - use_rethrow_when_possible
+    - use_setters_to_change_properties
+    - use_string_buffers
+    - use_string_in_part_of_directives
+    - use_super_parameters
+    - use_test_throws_matchers
+    - use_to_and_as_if_applicable
+    - valid_regexps
+    - void_checks
+    - vx_dummy_rule
+    - vy_dummy_rule
diff --git a/packages/diffscrape/test/data/no_changed_rules.yaml b/packages/diffscrape/test/data/no_changed_rules.yaml
new file mode 100644
index 0000000..04199f1
--- /dev/null
+++ b/packages/diffscrape/test/data/no_changed_rules.yaml
@@ -0,0 +1,225 @@
+linter:
+  rules:
+    - always_declare_return_types
+    - always_put_control_body_on_new_line
+    - always_put_required_named_parameters_first
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    - always_use_package_imports
+    - annotate_overrides
+    - annotate_redeclares
+    - avoid_annotating_with_dynamic
+    - avoid_bool_literals_in_conditional_expressions
+    - avoid_catches_without_on_clauses
+    - avoid_catching_errors
+    - avoid_classes_with_only_static_members
+    - avoid_double_and_int_checks
+    - avoid_dynamic_calls
+    - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
+    - avoid_escaping_inner_quotes
+    - avoid_field_initializers_in_const_classes
+    - avoid_final_parameters
+    - avoid_function_literals_in_foreach_calls
+    - avoid_implementing_value_types
+    - avoid_init_to_null
+    - avoid_js_rounded_ints
+    - avoid_multiple_declarations_per_line
+    - avoid_null_checks_in_equality_operators
+    - avoid_positional_boolean_parameters
+    - avoid_print
+    - avoid_private_typedef_functions
+    - avoid_redundant_argument_values
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    - avoid_returning_null
+    - avoid_returning_null_for_future
+    - avoid_returning_null_for_void
+    - avoid_returning_this
+    - avoid_setters_without_getters
+    - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_type_to_string
+    - avoid_types_as_parameter_names
+    - avoid_types_on_closure_parameters
+    - avoid_unnecessary_containers
+    - avoid_unstable_final_fields
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    - avoid_web_libraries_in_flutter
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    - cascade_invocations
+    - cast_nullable_to_non_nullable
+    - close_sinks
+    - collection_methods_unrelated_type
+    - combinators_ordering
+    - comment_references
+    - conditional_uri_does_not_exist
+    - constant_identifier_names
+    - control_flow_in_finally
+    - curly_braces_in_flow_control_structures
+    - dangling_library_doc_comments
+    - depend_on_referenced_packages
+    - deprecated_consistency
+    - deprecated_member_use_from_same_package
+    - diagnostic_describe_all_properties
+    - directives_ordering
+    - discarded_futures
+    - do_not_use_environment
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    - eol_at_end_of_file
+    - exhaustive_cases
+    - file_names
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    - implicit_call_tearoffs
+    - implicit_reopen
+    - invalid_case_patterns
+    - iterable_contains_unrelated_type
+    - join_return_with_assignment
+    - leading_newlines_in_multiline_strings
+    - library_annotations
+    - library_names
+    - library_prefixes
+    - library_private_types_in_public_api
+    - lines_longer_than_80_chars
+    - list_remove_unrelated_type
+    - literal_only_boolean_expressions
+    - matching_super_parameters
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    - no_default_cases
+    - no_duplicate_case_values
+    - no_leading_underscores_for_library_prefixes
+    - no_leading_underscores_for_local_identifiers
+    - no_literal_bool_comparisons
+    - no_logic_in_create_state
+    - no_runtimeType_toString
+    - no_self_assignments
+    - no_wildcard_variable_uses
+    - non_constant_identifier_names
+    - noop_primitive_operations
+    - null_check_on_nullable_type_parameter
+    - null_closures
+    - omit_local_variable_types
+    - one_member_abstracts
+    - only_throw_errors
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    - parameter_assignments
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    - prefer_asserts_with_message
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    - prefer_constructors_over_static_methods
+    - prefer_contains
+    - prefer_double_quotes
+    - prefer_expression_function_bodies
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_final_parameters
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    - prefer_function_declarations_over_variables
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    - prefer_int_literals
+    - prefer_interpolation_to_compose_strings
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    - prefer_mixin
+    - prefer_null_aware_method_calls
+    - prefer_null_aware_operators
+    - prefer_relative_imports
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
+    - public_member_api_docs
+    - recursive_getters
+    - require_trailing_commas
+    - secure_pubspec_urls
+    - sized_box_for_whitespace
+    - sized_box_shrink_expand
+    - slash_for_doc_comments
+    - sort_child_properties_last
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    - tighten_type_of_initializing_formals
+    - type_annotate_public_apis
+    - type_init_formals
+    - type_literal_in_constant_pattern
+    - unawaited_futures
+    - unnecessary_await_in_return
+    - unnecessary_brace_in_string_interps
+    - unnecessary_breaks
+    - unnecessary_const
+    - unnecessary_constructor_name
+    - unnecessary_final
+    - unnecessary_getters_setters
+    - unnecessary_lambdas
+    - unnecessary_late
+    - unnecessary_library_directive
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_aware_operator_on_extension_on_nullable
+    - unnecessary_null_checks
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_raw_strings
+    - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unnecessary_to_list_in_spreads
+    - unreachable_from_main
+    - unrelated_type_equality_checks
+    - unsafe_html
+    - use_build_context_synchronously
+    - use_colored_box
+    - use_decorated_box
+    - use_enums
+    - use_full_hex_values_for_flutter_colors
+    - use_function_type_syntax_for_parameters
+    - use_if_null_to_convert_nulls_to_bools
+    - use_is_even_rather_than_modulo
+    - use_key_in_widget_constructors
+    - use_late_for_private_fields_and_variables
+    - use_named_constants
+    - use_raw_strings
+    - use_rethrow_when_possible
+    - use_setters_to_change_properties
+    - use_string_buffers
+    - use_string_in_part_of_directives
+    - use_super_parameters
+    - use_test_throws_matchers
+    - use_to_and_as_if_applicable
+    - valid_regexps
+    - void_checks
diff --git a/packages/diffscrape/test/diffscrape_test.dart b/packages/diffscrape/test/diffscrape_test.dart
new file mode 100644
index 0000000..0cc525b
--- /dev/null
+++ b/packages/diffscrape/test/diffscrape_test.dart
@@ -0,0 +1,80 @@
+import 'dart:io';
+
+import 'package:diffscrape/diffscrape.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('scrape', () {
+    test('no changed rules', () async {
+      final file = File('./test/data/no_changed_rules.yaml');
+      final oldValue = await file.readAsString();
+      final diffs = await scrape(
+        uriPath: 'https://dart.dev/tools/linter-rules/all',
+        filePath: file.path,
+        querySelector: 'pre code.yaml',
+        verbose: true,
+      );
+
+      addTearDown(
+        () => file.writeAsString('$oldValue', mode: FileMode.writeOnly),
+      );
+
+      expect(diffs.inserts, isEmpty);
+      expect(diffs.deletes, isEmpty);
+    });
+
+    test('inserted and deleted rules', () async {
+      final file = File('./test/data/inserted_and_deleted_rules.yaml');
+      final oldValue = await file.readAsString();
+      final diffs = await scrape(
+        uriPath: 'https://dart.dev/tools/linter-rules/all',
+        filePath: file.path,
+        querySelector: 'pre code.yaml',
+        verbose: true,
+      );
+
+      addTearDown(
+        () => file.writeAsString('$oldValue', mode: FileMode.writeOnly),
+      );
+
+      expect(diffs.inserts, hasLength(6));
+      expect(diffs.deletes, hasLength(7));
+    });
+
+    test('inserted rules', () async {
+      final file = File('./test/data/inserted_rules.yaml');
+      final oldValue = await file.readAsString();
+      final diffs = await scrape(
+        uriPath: 'https://dart.dev/tools/linter-rules/all',
+        filePath: file.path,
+        querySelector: 'pre code.yaml',
+        verbose: true,
+      );
+
+      addTearDown(
+        () => file.writeAsString('$oldValue', mode: FileMode.writeOnly),
+      );
+
+      expect(diffs.inserts, hasLength(6));
+      expect(diffs.deletes, isEmpty);
+    });
+
+    test('deleted rules', () async {
+      final file = File('./test/data/deleted_rules.yaml');
+      final oldValue = await file.readAsString();
+      final diffs = await scrape(
+        uriPath: 'https://dart.dev/tools/linter-rules/all',
+        filePath: file.path,
+        querySelector: 'pre code.yaml',
+        verbose: true,
+      );
+
+      addTearDown(
+        () => file.writeAsString('$oldValue', mode: FileMode.writeOnly),
+      );
+
+      expect(diffs.inserts, isEmpty);
+      expect(diffs.deletes, hasLength(7));
+    });
+  });
+}