Add mini test for checking clearCache emit

jestjs · Jul 9, 2019 · f404fbd · f404fbd
1 parent ab7f9e2
commit f404fbd
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Showing 2 changed files with 65 additions and 1 deletion.
diff --git a/packages/jest-core/package.json b/packages/jest-core/package.json
@@ -19,7 +19,7 @@
     "jest-haste-map": "^24.8.0",
     "jest-message-util": "^24.8.0",
     "jest-regex-util": "^24.3.0",
-    "jest-resolve": "^24.3.0",
+    "jest-resolve": "^24.8.0",
     "jest-resolve-dependencies": "^24.8.0",
     "jest-runner": "^24.8.0",
     "jest-runtime": "^24.8.0",

diff --git a/packages/jest-core/src/__tests__/watch.test.js b/packages/jest-core/src/__tests__/watch.test.js
@@ -11,6 +11,8 @@
 import chalk from 'chalk';
 import TestWatcher from '../TestWatcher';
 import {JestHook, KEYS} from 'jest-watcher';
+import HasteMap from 'jest-haste-map';
+import fs from 'fs';
 
 const runJestMock = jest.fn();
 const watchPluginPath = `${__dirname}/__fixtures__/watch_plugin`;
@@ -109,6 +111,10 @@ describe('Watch mode flows', () => {
     jest.doMock('jest-util/build/isInteractive', () => isInteractive);
     watch = require('../watch').default;
     const config = {
+      haste: {
+        defaultPlatform: 'android',
+      },
+      moduleFileExtensions: ['js', 'jsx', 'ts', 'tsx', 'json'],
       rootDir: __dirname,
       roots: [],
       testPathIgnorePatterns: [],
@@ -576,6 +582,64 @@ describe('Watch mode flows', () => {
     });
   });
 
+  describe('check clear cache modules', () => {
+    const fileTargetPath = `${__dirname}/__fixtures__/hey.test.js`;
+    let hasteMapInstance;
+    let Resolver;
+    let originalClearCache;
+
+    beforeEach(() => {
+      Resolver = require('jest-resolve');
+      originalClearCache = Resolver.clearCache;
+    });
+
+    afterEach(() => {
+      Resolver.clearCache = originalClearCache;
+      hasteMapInstance.end();
+      try {
+        fs.unlinkSync(fileTargetPath);
+      } catch (e) {}
+    });
+
+    it('should correct require new files without legacy cache', async () => {
+      hasteMapInstance = new HasteMap({
+        computeSha1: false,
+        extensions: ['js'],
+        forceNodeFilesystemAPI: false,
+        maxWorkers: 2,
+        name: 'tmp_' + Date.now(),
+        platforms: [],
+        retainAllFiles: true,
+        rootDir: __dirname,
+        roots: [__dirname],
+        throwOnModuleCollision: true,
+        useWatchman: true,
+        watch: true,
+      });
+
+      await hasteMapInstance.build();
+
+      await watch(
+        {
+          ...globalConfig,
+          rootDir: __dirname,
+          watchPlugins: [],
+        },
+        contexts,
+        pipe,
+        [hasteMapInstance],
+        stdin,
+      );
+
+      Resolver.clearCache = jest.fn();
+
+      fs.writeFileSync(fileTargetPath, '', {encoding: 'utf-8'});
+
+      await new Promise(resolve => setTimeout(resolve, 100));
+      expect(Resolver.clearCache).toHaveBeenCalledTimes(1);
+    });
+  });
+
   it('makes watch plugin initialization errors look nice', async () => {
     const pluginPath = `${__dirname}/__fixtures__/watch_plugin_throws`;