MM-52213 webapp/platform/components : Add unit test framework (#23366)

webapp/platform/components/jest.config.js

@@ -0,0 +1,21 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+/** @type {import('jest').Config} */
+
+const config = {
+    moduleDirectories: ['src', 'node_modules'],
+    testEnvironment: 'jsdom',
+    testPathIgnorePatterns: ['/node_modules/', '/.rollup.cache/', '/dist/'],
+    clearMocks: true,
+    moduleNameMapper: {
+        '^@mattermost/(components)$': '<rootDir>/../platform/$1/src',
+        '^@mattermost/(client)$': '<rootDir>/../platform/$1/src',
+        '^@mattermost/(types)/(.*)$': '<rootDir>/../platform/$1/src/$2',
+        '^.+\\.(css|scss)$': 'identity-obj-proxy',
+    },
+    moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
+    setupFilesAfterEnv: ['<rootDir>/src/setupTests.ts'],
+};
+
+module.exports = config;