Add tests for module import with and without cache

test/index.test.ts

@@ -6,6 +6,7 @@ import {
   DEFAULT_EXPECTED_RESULT_FROM_SAMPLE_DIRECTORY,
   DEFAULT_RELATIVE_PATH_TO_SAMPLE_DIRECTORY,
 } from './constants';
+import fs from 'fs';
 
 test('Import modules from the default (current) directory synchronously', () => {
   const result = directoryImport();
@@ -221,3 +222,44 @@ test('Import modules with specified options and call the provided callback for e
   expect(result).toEqual(DEFAULT_EXPECTED_RESULT_FROM_SAMPLE_DIRECTORY);
   expect(callbackResults).toEqual(DEFAULT_EXPECTED_CALLBACK_RESULTS_FROM_SAMPLE_DIRECTORY);
 });
+
+test('Import modules with cache', () => {
+  const result = directoryImport(DEFAULT_RELATIVE_PATH_TO_SAMPLE_DIRECTORY)
+
+  expect(result).toEqual(DEFAULT_EXPECTED_RESULT_FROM_SAMPLE_DIRECTORY);
+
+  // change the content of sample-file-2.js
+  fs.writeFileSync(`${DEFAULT_ABSOLUTE_PATH_TO_SAMPLE_DIRECTORY}/sample-file-2.js`, "// eslint-disable-next-line unicorn/no-empty-file, no-undef, unicorn/prefer-module\nmodule.exports = { testData: 'Hello World Changed!' };\n");
+
+  // re-import the modules
+  const result2 = directoryImport({
+    targetDirectoryPath: DEFAULT_RELATIVE_PATH_TO_SAMPLE_DIRECTORY,
+    forceReload: false,
+  });
+
+  expect(result2).toEqual(DEFAULT_EXPECTED_RESULT_FROM_SAMPLE_DIRECTORY);
+  // revert the content of sample-file-2.js
+  fs.writeFileSync(`${DEFAULT_ABSOLUTE_PATH_TO_SAMPLE_DIRECTORY}/sample-file-2.js`, "// eslint-disable-next-line unicorn/no-empty-file, no-undef, unicorn/prefer-module\nmodule.exports = { testData: 'Hello World!' };\n");
+});
+
+test('Import modules without cache', () => {
+  const result = directoryImport(DEFAULT_RELATIVE_PATH_TO_SAMPLE_DIRECTORY)
+
+  expect(result).toEqual(DEFAULT_EXPECTED_RESULT_FROM_SAMPLE_DIRECTORY);
+
+  // change the content of sample-file-2.js
+  fs.writeFileSync(`${DEFAULT_ABSOLUTE_PATH_TO_SAMPLE_DIRECTORY}/sample-file-2.js`, "// eslint-disable-next-line unicorn/no-empty-file, no-undef, unicorn/prefer-module\nmodule.exports = { testData: 'Hello World Changed!' };\n");
+
+  jest.resetModules();
+
+  // re-import the modules
+  const result2 = directoryImport({
+    targetDirectoryPath: DEFAULT_RELATIVE_PATH_TO_SAMPLE_DIRECTORY,
+    forceReload: true,
+  });
+
+  expect(result2['/sample-file-2.js']).toEqual({ testData: 'Hello World Changed!' });
+
+  // revert the content of sample-file-2.js
+  fs.writeFileSync(`${DEFAULT_ABSOLUTE_PATH_TO_SAMPLE_DIRECTORY}/sample-file-2.js`, "// eslint-disable-next-line unicorn/no-empty-file, no-undef, unicorn/prefer-module\nmodule.exports = { testData: 'Hello World!' };\n");
+});