From 2f5380a58a0ecad4950fc4d1f01e36dc9a38b5c0 Mon Sep 17 00:00:00 2001
From: Mihail Bodrov <bodrovmiha@yandex.ru>
Date: Wed, 10 Jul 2019 01:06:54 +0300
Subject: [PATCH] Add mini test for checking clearCache emit

---
 packages/jest-core/package.json               |  2 +-
 .../jest-core/src/__tests__/watch.test.js     | 54 +++++++++++++++++++
 2 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/packages/jest-core/package.json b/packages/jest-core/package.json
index a63d9f48fb08..60bf1868942f 100644
--- 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
index 358446807c64..1481aa2457cb 100644
--- a/packages/jest-core/src/__tests__/watch.test.js
+++ b/packages/jest-core/src/__tests__/watch.test.js
@@ -11,6 +11,7 @@
 import chalk from 'chalk';
 import TestWatcher from '../TestWatcher';
 import {JestHook, KEYS} from 'jest-watcher';
+import EventEmmiter from 'events';
 
 const runJestMock = jest.fn();
 const watchPluginPath = `${__dirname}/__fixtures__/watch_plugin`;
@@ -109,6 +110,10 @@ 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 +581,55 @@ describe('Watch mode flows', () => {
     });
   });
 
+  describe('check clear cache modules', () => {
+    let Resolver;
+    let originalClearCache;
+
+    beforeEach(() => {
+      Resolver = require('jest-resolve');
+      originalClearCache = Resolver.clearCache;
+    });
+
+    afterEach(() => {
+      Resolver.clearCache = originalClearCache;
+    });
+
+    it('should correct require new files without legacy cache', async () => {
+      const fileTargetPath = `${__dirname}/__fixtures__/hey.test.js`;
+      const hasteMapInstance = new EventEmmiter();
+
+      await watch(
+        {
+          ...globalConfig,
+          rootDir: __dirname,
+          watchPlugins: [],
+        },
+        contexts,
+        pipe,
+        [hasteMapInstance],
+        stdin,
+      );
+
+      Resolver.clearCache = jest.fn();
+
+      hasteMapInstance.emit('change', {
+        eventsQueue: [
+          {
+            filePath: fileTargetPath,
+            stat: {},
+            type: 'add',
+          },
+        ],
+        hasteFS: {
+          _rootDir: __dirname,
+        },
+        moduleMap: {},
+      });
+
+      expect(Resolver.clearCache).toHaveBeenCalledTimes(1);
+    });
+  });
+
   it('makes watch plugin initialization errors look nice', async () => {
     const pluginPath = `${__dirname}/__fixtures__/watch_plugin_throws`;