jestjs · SimenB · Apr 4, 2022 · Mar 31, 2022 · Mar 31, 2022 · Mar 31, 2022
diff --git a/docs/CLI.md b/docs/CLI.md
@@ -224,6 +224,10 @@ This feature is an escape-hatch. If Jest doesn't exit at the end of a test run,
 
 Show the help information, similar to this page.
 
+### `--igoreProjects <project1> ... <projectN>`
+
+Ignore the tests of the specified projects. Jest uses the attribute `displayName` in the configuration to identify each project. If you use this option, you should provide a `displayName` to all your projects.
+
 ### `--init`
 
 Generate a basic configuration file. Based on your project, Jest will ask you a few questions that will help to generate a `jest.config.js` file with a short description for each option.
@@ -332,7 +336,7 @@ The default regex matching works fine on small runs, but becomes slow if provide
 
 ### `--selectProjects <project1> ... <projectN>`
 
-Run only the tests of the specified projects. Jest uses the attribute `displayName` in the configuration to identify each project. If you use this option, you should provide a `displayName` to all your projects.
+Run the tests of the specified projects. Jest uses the attribute `displayName` in the configuration to identify each project. If you use this option, you should provide a `displayName` to all your projects.
 
 ### `--setupFilesAfterEnv <path1> ... <pathN>`
 

diff --git a/e2e/__tests__/selectProjects.test.ts b/e2e/__tests__/selectProjects.test.ts
@@ -111,6 +111,89 @@ describe('Given a config with two named projects, first-project and second-proje
       );
     });
   });
+
+  describe('when Jest is started with `--ignoreProjects first-project', () => {
+    let result: RunJestJsonResult;
+    beforeAll(() => {
+      result = runWithJson('select-projects', [
+        '--ignoreProjects',
+        'first-project',
+      ]);
+    });
+    it('runs the tests in the second project only', () => {
+      expect(result.json).toHaveProperty('success', true);
+      expect(result.json).toHaveProperty('numTotalTests', 1);
+      expect(result.json.testResults.map(({name}) => name)).toEqual([
+        resolve(dir, '__tests__/second-project.test.js'),
+      ]);
+    });
+    it('prints that only second-project will run', () => {
+      expect(result.stderr).toMatch(/^Running one project: second-project/);
+    });
+  });
+
+  describe('when Jest is started with `--ignoreProjects second-project', () => {
+    let result: RunJestJsonResult;
+    beforeAll(() => {
+      result = runWithJson('select-projects', [
+        '--ignoreProjects',
+        'second-project',
+      ]);
+    });
+    it('runs the tests in the first project only', () => {
+      expect(result.json).toHaveProperty('success', true);
+      expect(result.json).toHaveProperty('numTotalTests', 1);
+      expect(result.json.testResults.map(({name}) => name)).toEqual([
+        resolve(dir, '__tests__/first-project.test.js'),
+      ]);
+    });
+    it('prints that only first-project will run', () => {
+      expect(result.stderr).toMatch(/^Running one project: first-project/);
+    });
+  });
+
+  describe('when Jest is started with `--ignoreProjects third-project`', () => {
+    let result: RunJestJsonResult;
+    beforeAll(() => {
+      result = runWithJson('select-projects', [
+        '--ignoreProjects',
+        'third-project',
+      ]);
+    });
+    it('runs the tests in the first and second projects', () => {
+      expect(result.json).toHaveProperty('success', true);
+      expect(result.json).toHaveProperty('numTotalTests', 2);
+      expect(result.json.testResults.map(({name}) => name).sort()).toEqual([
+        resolve(dir, '__tests__/first-project.test.js'),
+        resolve(dir, '__tests__/second-project.test.js'),
+      ]);
+    });
+    it('prints that both first-project and second-project will run', () => {
+      expect(result.stderr).toMatch(
+        /^Running 2 projects:\n- first-project\n- second-project/,
+      );
+    });
+  });
+
+  describe('when Jest is started with `--ignoreProjects first-project second-project`', () => {
+    let result: RunJestResult;
+    beforeAll(() => {
+      result = run('select-projects', [
+        '--ignoreProjects',
+        'first-project',
+        'second-project',
+      ]);
+    });
+    it('fails', () => {
+      expect(result).toHaveProperty('failed', true);
+    });
+    // FIXME(F3n67u)
+    it.skip('prints that no project was found', () => {
+      expect(result.stdout).toMatch(
+        /^You provided values for --selectProjects but no projects were found matching the selection/,
+      );
+    });
+  });
 });
 
 describe('Given a config with two projects, first-project and an unnamed project', () => {
@@ -185,4 +268,30 @@ describe('Given a config with two projects, first-project and an unnamed project
       );
     });
   });
+
+  describe('when Jest is started with `--ignoreProjects first-project`', () => {
+    let result: RunJestJsonResult;
+    beforeAll(() => {
+      result = runWithJson('select-projects-missing-name', [
+        '--ignoreProjects',
+        'first-project',
+      ]);
+    });
+    it('runs the tests in the second project only', () => {
+      expect(result.json.success).toBe(true);
+      expect(result.json.numTotalTests).toBe(1);
+      expect(result.json.testResults.map(({name}) => name)).toEqual([
+        resolve(dir, '__tests__/second-project.test.js'),
+      ]);
+    });
+    it('prints that a project does not have a name', () => {
+      expect(result.stderr).toMatch(
+        /^You provided values for --ignoreProjects but a project does not have a name/,
+      );
+    });
+    it('prints that only second-project will run', () => {
+      const stderrThirdLine = result.stderr.split('\n')[2];
+      expect(stderrThirdLine).toMatch(/^Running one project: second-project/);
+    });
+  });
 });
diff --git a/packages/jest-cli/src/__tests__/cli/args.test.ts b/packages/jest-cli/src/__tests__/cli/args.test.ts
@@ -81,6 +81,12 @@ describe('check', () => {
     );
   });
 
+  it('raises an exception if ignoreProjects is not provided any project names', () => {
+    expect(() => check(argv({ignoreProjects: []}))).toThrow(
+      'The --ignoreProjects option requires the name of at least one project to be specified.\n',
+    );
+  });
+
   it('raises an exception if config is not a valid JSON string', () => {
     expect(() => check(argv({config: 'x:1'}))).toThrow(
       'The --config option requires a JSON string literal, or a file path with one of these extensions: .js, .ts, .mjs, .cjs, .json',

diff --git a/packages/jest-cli/src/cli/args.ts b/packages/jest-cli/src/cli/args.ts
@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import type {Options} from 'yargs';
 import type {Config} from '@jest/types';
 import {constants, isJSONString} from 'jest-config';
 
@@ -68,6 +69,13 @@ export function check(argv: Config.Argv): true {
     );
   }
 
+  if (argv.ignoreProjects && argv.ignoreProjects.length === 0) {
+    throw new Error(
+      'The --ignoreProjects option requires the name of at least one project to be specified.\n' +
+        'Example usage: jest --ignoreProjects my-first-project my-second-project',
+    );
+  }
+
   if (
     argv.config &&
     !isJSONString(argv.config) &&
@@ -95,7 +103,7 @@ export const usage =
 export const docs = 'Documentation: https://jestjs.io/';
 
 // The default values are all set in jest-config
-export const options = {
+export const options: {[key: string]: Options} = {
   all: {
     description:
       'The opposite of `onlyChanged`. If `onlyChanged` is set by ' +
@@ -301,6 +309,13 @@ export const options = {
       'A JSON string with map of variables for the haste module system',
     type: 'string',
   },
+  ignoreProjects: {
+    description:
+      'Ignore the tests of the specified projects.' +
+      'Jest uses the attribute `displayName` in the configuration to identify each project.',
+    string: true,
+    type: 'array',
+  },
   init: {
     description: 'Generate a basic configuration file',
     type: 'boolean',
@@ -502,7 +517,7 @@ export const options = {
   },
   selectProjects: {
     description:
-      'Run only the tests of the specified projects.' +
+      'Run the tests of the specified projects.' +
       'Jest uses the attribute `displayName` in the configuration to identify each project.',
     string: true,
     type: 'array',
@@ -695,4 +710,4 @@ export const options = {
       '--no-watchman.',
     type: 'boolean',
   },
-} as const;
+};
diff --git a/packages/jest-core/src/cli/index.ts b/packages/jest-core/src/cli/index.ts
@@ -71,16 +71,18 @@ export async function runCLI(
     exit(0);
   }
 
-  let configsOfProjectsToRun = configs;
-  if (argv.selectProjects) {
-    const namesMissingWarning = getProjectNamesMissingWarning(configs);
+  const configsOfProjectsToRun = getConfigsOfProjectsToRun(configs, {
+    ignoreProjects: argv.ignoreProjects,
+    selectProjects: argv.selectProjects,
+  });
+  if (argv.selectProjects || argv.ignoreProjects) {
+    const namesMissingWarning = getProjectNamesMissingWarning(configs, {
+      ignoreProjects: argv.ignoreProjects,
+      selectProjects: argv.selectProjects,
+    });
     if (namesMissingWarning) {
       outputStream.write(namesMissingWarning);
     }
-    configsOfProjectsToRun = getConfigsOfProjectsToRun(
-      argv.selectProjects,
-      configs,
-    );
     outputStream.write(getSelectProjectsMessage(configsOfProjectsToRun));
   }
 

diff --git a/packages/jest-core/src/getConfigsOfProjectsToRun.ts b/packages/jest-core/src/getConfigsOfProjectsToRun.ts
@@ -9,12 +9,38 @@ import type {Config} from '@jest/types';
 import getProjectDisplayName from './getProjectDisplayName';
 
 export default function getConfigsOfProjectsToRun(
-  namesOfProjectsToRun: Array<string>,
   projectConfigs: Array<Config.ProjectConfig>,
+  opts: {
+    ignoreProjects: Array<string> | undefined;
+    selectProjects: Array<string> | undefined;
+  },
 ): Array<Config.ProjectConfig> {
-  const setOfProjectsToRun = new Set<string>(namesOfProjectsToRun);
+  const projectFilter = createProjectFilter(opts);
   return projectConfigs.filter(config => {
     const name = getProjectDisplayName(config);
-    return name && setOfProjectsToRun.has(name);
+    return projectFilter(name);
   });
 }
+
+function createProjectFilter(opts: {
+  ignoreProjects: Array<string> | undefined;
+  selectProjects: Array<string> | undefined;
+}) {
+  const {selectProjects, ignoreProjects} = opts;
+
+  const always = () => true;
+
+  const selected = selectProjects
+    ? (name: string | undefined) => name && selectProjects.includes(name)
+    : always;
+
+  const notIgnore = ignoreProjects
+    ? (name: string | undefined) => !name || !ignoreProjects.includes(name)
+    : always;
+
+  function test(name: string | undefined) {
+    return selected(name) && notIgnore(name);
+  }
+
+  return test;
+}
diff --git a/packages/jest-core/src/getProjectNamesMissingWarning.ts b/packages/jest-core/src/getProjectNamesMissingWarning.ts
@@ -11,15 +11,26 @@ import getProjectDisplayName from './getProjectDisplayName';
 
 export default function getProjectNamesMissingWarning(
   projectConfigs: Array<Config.ProjectConfig>,
+  opts: {
+    ignoreProjects: Array<string> | undefined;
+    selectProjects: Array<string> | undefined;
+  },
 ): string | undefined {
   const numberOfProjectsWithoutAName = projectConfigs.filter(
     config => !getProjectDisplayName(config),
   ).length;
   if (numberOfProjectsWithoutAName === 0) {
     return undefined;
   }
+  const args: Array<string> = [];
+  if (opts.selectProjects) {
+    args.push('--selectProjects');
+  }
+  if (opts.ignoreProjects) {
+    args.push('--ignoreProjects');
+  }
   return chalk.yellow(
-    `You provided values for --selectProjects but ${
+    `You provided values for ${args.join(' and ')} but ${
       numberOfProjectsWithoutAName === 1
         ? 'a project does not have a name'
         : `${numberOfProjectsWithoutAName} projects do not have a name`

diff --git a/packages/jest-types/src/Config.ts b/packages/jest-types/src/Config.ts
@@ -468,6 +468,7 @@ export type Argv = Arguments<
     roots: Array<string>;
     runInBand: boolean;
     selectProjects: Array<string>;
+    ignoreProjects: Array<string>;
     setupFiles: Array<string>;
     setupFilesAfterEnv: Array<string>;
     shard: string;