test: Port legacy tests to tap

This removes all the relatively cryptic legacy tests and creates
new tap tests that check the same functionality.

Credit: @iarna
Credit: @zkat
PR-URL: npm#11292
Reviewed-By: @iarna
Reviewed-By: @zkat
Reviewed-By: @othiym23

.travis.yml

@@ -13,6 +13,6 @@ before_install:
   - "node . install -g ."
   - "mkdir -p /var/run/couchdb"
 sudo: false
-script: "npm run-script test-all"
+script: "npm test"
 notifications:
     slack: npm-inc:kRqQjto7YbINqHPb1X6nS3g8

package.json

@@ -208,8 +208,6 @@
     "preversion": "bash scripts/update-authors.sh && git add AUTHORS && git commit -m \"update AUTHORS\" || true",
     "tap": "tap --timeout 240",
     "test": "standard && npm run test-tap",
-    "test-all": "standard && npm run test-legacy && npm run test-tap",
-    "test-legacy": "node ./test/run.js",
     "test-tap": "npm run tap -- \"test/tap/*.js\"",
     "test-node": "\"$NODE\" ./test/run.js && \"$NODE\" \"node_modules/.bin/tap\" --timeout 240 \"test/tap/*.js\""
   },