Add summary_reporter.test.js

CHANGELOG.md

@@ -12,7 +12,8 @@
 * `[expect]` Support class instances in `.toHaveProperty()` matcher.
   ([#5367](https://github.com/facebook/jest/pull/5367))
 * `[jest-cli]` Fix npm update command for snapshot summary.
-  ([#5376](https://github.com/facebook/jest/pull/5376))
+  ([#5376](https://github.com/facebook/jest/pull/5376),
+  [5389](https://github.com/facebook/jest/pull/5389/))
 * `[expect]` Make `rejects` and `resolves` synchronously validate its argument.
   ([#5364](https://github.com/facebook/jest/pull/5364))
 

packages/jest-cli/src/reporters/__tests__/summary_reporter.test.js

@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+const env = Object.assign({}, process.env);
+const write = process.stderr.write;
+const globalConfig = {
+  watch: false,
+};
+const aggregatedResults = {
+  numTotalTestSuites: 1,
+  snapshot: {
+    filesUnmatched: 1,
+    unmatched: 2,
+  },
+  testResults: {},
+};
+
+let results = [];
+let SummaryReporter;
+
+beforeEach(() => {
+  process.env.npm_lifecycle_event = 'test';
+  process.env.npm_lifecycle_script = 'jest';
+  process.stderr.write = result => results.push(result);
+  SummaryReporter = require('../summary_reporter').default;
+});
+
+afterEach(() => {
+  results = [];
+  process.env = env;
+  process.stderr.write = write;
+});
+
+describe('onRunComplete', () => {
+  test('npm test', () => {
+    process.env.npm_config_user_agent = 'npm';
+    const results = [];
+    process.stderr.write = result => results.push(result);
+    const testReporter = new SummaryReporter(globalConfig);
+    testReporter.onRunComplete(new Set(), aggregatedResults);
+    expect(results[0]).toMatch('\u001b[1mSnapshot Summary\u001b[22m');
+    expect(results[1]).toMatch(
+      '\u001b[1m\u001b[31m › 2 snapshot tests\u001b[39m\u001b[22m failed in 1 test suite. ' +
+        '\u001b[2mInspect your code changes or run `npm test -- -u` to update them.\u001b[22m',
+    );
+  });
+
+  test('yarn test', () => {
+    process.env.npm_config_user_agent = 'yarn';
+    const testReporter = new SummaryReporter(globalConfig);
+    testReporter.onRunComplete(new Set(), aggregatedResults);
+    expect(results[0]).toMatch('\u001b[1mSnapshot Summary\u001b[22m');
+    expect(results[1]).toMatch(
+      '\u001b[1m\u001b[31m › 2 snapshot tests\u001b[39m\u001b[22m failed in 1 test suite. ' +
+        '\u001b[2mInspect your code changes or run `yarn test -u` to update them.\u001b[22m',
+    );
+  });
+});