Fix warning message when there are no tests (#8595)

Author: kaykayehnn

CHANGELOG.md

@@ -15,6 +15,7 @@
 - `[jest-core]` Make watch plugin initialization errors look nice ([#8422](https://github.com/facebook/jest/pull/8422))
 - `[jest-snapshot]` Prevent inline snapshots from drifting when inline snapshots are updated ([#8492](https://github.com/facebook/jest/pull/8492))
 - `[jest-haste-map]` Don't throw on missing mapper in Node crawler ([#8558](https://github.com/facebook/jest/pull/8558))
+- `[jest-core]` Fix incorrect `passWithNoTests` warning ([#8595](https://github.com/facebook/jest/pull/8595))
 
 ### Chore & Maintenance
 

packages/jest-core/src/__tests__/__snapshots__/getNoTestsFoundMessage.test.js.snap

@@ -0,0 +1,25 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`getNoTestsFoundMessage returns correct message when monitoring only changed 1`] = `"<bold>No tests found related to files changed since last commit.</>"`;
+
+exports[`getNoTestsFoundMessage returns correct message when monitoring only failures 1`] = `
+"<bold>No failed test found.</>
+<bold></><dim>Press \`f\` to quit \\"only failed tests\\" mode.</>"
+`;
+
+exports[`getNoTestsFoundMessage returns correct message with passWithNoTests 1`] = `"<bold>No tests found, exiting with code 0</>"`;
+
+exports[`getNoTestsFoundMessage returns correct message with verbose option 1`] = `
+"<bold>No tests found, exiting with code 1</>
+Run with \`--passWithNoTests\` to exit with code 0
+
+Pattern: <yellow>/path/pattern</> - 0 matches"
+`;
+
+exports[`getNoTestsFoundMessage returns correct message without options 1`] = `
+"<bold>No tests found, exiting with code 1</>
+Run with \`--passWithNoTests\` to exit with code 0
+In <bold>/root/dir</>
+  0 files checked across 0 projects. Run with \`--verbose\` for more details.
+Pattern: <yellow>/path/pattern</> - 0 matches"
+`;

packages/jest-core/src/__tests__/getNoTestsFoundMessage.test.js

@@ -0,0 +1,38 @@
+// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+
+import getNoTestsFoundMessage from '../getNoTestsFoundMessage';
+
+describe('getNoTestsFoundMessage', () => {
+  function createGlobalConfig(options) {
+    return {
+      rootDir: '/root/dir',
+      testPathPattern: '/path/pattern',
+      ...options,
+    };
+  }
+
+  test('returns correct message when monitoring only failures', () => {
+    const config = createGlobalConfig({onlyFailures: true});
+    expect(getNoTestsFoundMessage([], config)).toMatchSnapshot();
+  });
+
+  test('returns correct message when monitoring only changed', () => {
+    const config = createGlobalConfig({onlyChanged: true});
+    expect(getNoTestsFoundMessage([], config)).toMatchSnapshot();
+  });
+
+  test('returns correct message with verbose option', () => {
+    const config = createGlobalConfig({verbose: true});
+    expect(getNoTestsFoundMessage([], config)).toMatchSnapshot();
+  });
+
+  test('returns correct message without options', () => {
+    const config = createGlobalConfig();
+    expect(getNoTestsFoundMessage([], config)).toMatchSnapshot();
+  });
+
+  test('returns correct message with passWithNoTests', () => {
+    const config = createGlobalConfig({passWithNoTests: true});
+    expect(getNoTestsFoundMessage([], config)).toMatchSnapshot();
+  });
+});

packages/jest-core/src/getNoTestFoundPassWithNoTests.ts

@@ -0,0 +1,7 @@
+// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+
+import chalk from 'chalk';
+
+export default function getNoTestFoundPassWithNoTests() {
+  return chalk.bold('No tests found, exiting with code 0');
+}

packages/jest-core/src/getNoTestsFoundMessage.ts

@@ -11,6 +11,7 @@ import getNoTestFound from './getNoTestFound';
 import getNoTestFoundRelatedToChangedFiles from './getNoTestFoundRelatedToChangedFiles';
 import getNoTestFoundVerbose from './getNoTestFoundVerbose';
 import getNoTestFoundFailed from './getNoTestFoundFailed';
+import getNoTestFoundPassWithNoTests from './getNoTestFoundPassWithNoTests';
 
 export default function getNoTestsFoundMessage(
   testRunData: TestRunData,
@@ -22,6 +23,9 @@ export default function getNoTestsFoundMessage(
   if (globalConfig.onlyChanged) {
     return getNoTestFoundRelatedToChangedFiles(globalConfig);
   }
+  if (globalConfig.passWithNoTests) {
+    return getNoTestFoundPassWithNoTests();
+  }
   return testRunData.length === 1 || globalConfig.verbose
     ? getNoTestFoundVerbose(testRunData, globalConfig)
     : getNoTestFound(testRunData, globalConfig);