test(jest): add integration test package to test jest config setup

with a11y matcher api

Fixes #11

jest.config.js

@@ -13,4 +13,8 @@ module.exports = {
             statements: 80,
         },
     },
+    // Exclude integration tests from this config as it has its own config
+    testPathIgnorePatterns: ['<rootDir>/packages/test-integ'],
+    // Direct Jest read the jest config file from integration tests
+    projects: ['<rootDir>', '<rootDir>/packages/test-integ'],
 };

packages/jest/src/index.ts

@@ -7,7 +7,3 @@
 
 export { toBeAccessible } from './matcher';
 export { registerA11yMatchers } from './setup';
-
-export const jestConfig = {
-    setupFilesAfterEnv: [require.resolve('./setup')],
-};

packages/jest/src/setup.ts

@@ -45,6 +45,3 @@ export function adaptA11yConfig(config: A11yConfig): A11yConfig {
         },
     };
 }
-
-// When this file is used as part of Jest setup with setupFilesAfterEnv
-registerA11yMatchers();

packages/test-integ/__tests__/integration.test.js

@@ -6,8 +6,8 @@
  */
 
 describe('integration test @sa11y/jest', () => {
-    it.skip('should have a11y matchers working with setup in jest.config.js', () => {
-        // TODO(Fix) : Fails with TypeError: expect(...).toBeAccessible is not a function
+    it('should have a11y matchers working with setup in jest.config.js', () => {
+        expect(expect.toBeAccessible).toBeDefined();
         expect(document).toBeAccessible();
     });
 });

packages/test-integ/jest-setup.js

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2020, salesforce.com, inc.
+ * All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/BSD-3-Clause
+ */
+
+// Since this is not a typescript project, disabling typescript eslint warning
+// TODO (lint): using 'exclude: ["./packages/test-integ/**/*.js"]' in tsconfig.eslint.json doesn't work
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { registerA11yMatchers } = require('@sa11y/jest');
+
+registerA11yMatchers();

packages/test-integ/jest.config.js

@@ -5,9 +5,6 @@
  * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/BSD-3-Clause
  */
 
-// eslint-disable-next-line @typescript-eslint/no-var-requires
-const { jestConfig } = require('@sa11y/jest');
-
 module.exports = {
-    ...jestConfig,
+    setupFilesAfterEnv: ['./jest-setup.js'],
 };

tsconfig.common.json

@@ -8,7 +8,7 @@
         "strict": true,
         "noEmitOnError": true,
         "noUnusedLocals": true,
-        "module": "ESNext",
+        "module": "commonjs",
         "moduleResolution": "node",
         "esModuleInterop": true,
         "forceConsistentCasingInFileNames": true

tsconfig.eslint.json

@@ -1,4 +1,4 @@
 {
     "compilerOptions": { "strict": true },
-    "include": ["*.js", "./packages/**/*.ts", "./packages/**/*.js"]
+    "include": ["*.js", "./packages/**/*.ts", "./packages/test-integ/**/*.js"]
 }