Allow unmatched test paths from CLI (#3882)

* Allow to pass the exact test filenames

* Replaced custom check with fs.existsSync(), added tests

* Changed licence to MIT

* Fixed tests

integration_tests/__tests__/__snapshots__/cli-accepts-exact-filenames.test.js.snap

@@ -0,0 +1,29 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CLI accepts exact filenames 1`] = `
+"PASS ./bar.js
+  ● Console
+
+    console.log bar.js:2
+      Hey
+
+PASS foo/baz.js
+  ● Console
+
+    console.log foo/baz.js:2
+      Hey
+
+
+"
+`;
+
+exports[`CLI accepts exact filenames 2`] = `
+"Test Suites: 2 passed, 2 total
+Tests:       2 passed, 2 total
+Snapshots:   0 total
+Time:        <<REPLACED>>
+Ran all test suites matching /.\\\\/bar.js|.\\\\/foo\\\\/baz.js/i.
+"
+`;
+
+exports[`CLI accepts exact filenames 3`] = `""`;

integration_tests/__tests__/cli-accepts-exact-filenames.test.js

@@ -0,0 +1,47 @@
+/**
+ * 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.
+ *
+ * @flow
+ */
+
+'use strict';
+
+const path = require('path');
+const skipOnWindows = require('../../scripts/skip_on_windows');
+const {extractSummary, cleanup, writeFiles} = require('../utils');
+const runJest = require('../runJest');
+
+const DIR = path.resolve(__dirname, '../cli_accepts_exact_filenames');
+
+skipOnWindows.suite();
+
+beforeEach(() => cleanup(DIR));
+afterAll(() => cleanup(DIR));
+
+test('CLI accepts exact filenames', () => {
+  writeFiles(DIR, {
+    'bar.js': `
+      test('bar', () => console.log('Hey'));
+    `,
+    'foo/baz.js': `
+      test('baz', () => console.log('Hey'));
+    `,
+    'package.json': '{}',
+  });
+
+  const {stderr, stdout, status} = runJest(DIR, [
+    '-i',
+    '--ci=false',
+    '--forceExit',
+    './bar.js',
+    './foo/baz.js',
+  ]);
+  const {rest, summary} = extractSummary(stderr);
+  expect(status).toBe(0);
+  expect(rest).toMatchSnapshot();
+  expect(summary).toMatchSnapshot();
+  expect(stdout).toMatchSnapshot();
+});

integration_tests/__tests__/find_related_files.test.js

@@ -35,7 +35,7 @@ test('runs tests related to filename', () => {
   });
 
   const {stdout} = runJest(DIR, ['a.js']);
-  expect(stdout).toMatch(/no tests found/i);
+  expect(stdout).toMatch('');
 
   const {stderr} = runJest(DIR, ['--findRelatedTests', 'a.js']);
   expect(stderr).toMatch('PASS __tests__/test.test.js');

packages/jest-cli/src/search_source.js

@@ -12,6 +12,7 @@ import type {Glob, GlobalConfig, Path} from 'types/Config';
 import type {Test} from 'types/TestRunner';
 import type {ChangedFilesPromise} from 'types/ChangedFiles';
 
+import fs from 'fs';
 import path from 'path';
 import micromatch from 'micromatch';
 import DependencyResolver from 'jest-resolve-dependencies';
@@ -207,12 +208,18 @@ export default class SearchSource {
       return Promise.resolve(this.findTestsByPaths(paths));
     } else if (globalConfig.findRelatedTests && paths && paths.length) {
       return Promise.resolve(this.findRelatedTestsFromPattern(paths));
-    } else if (globalConfig.testPathPattern != null) {
-      return Promise.resolve(
-        this.findMatchingTests(globalConfig.testPathPattern),
-      );
     } else {
-      return Promise.resolve({tests: []});
+      const validTestPaths = paths && paths.filter(fs.existsSync);
+
+      if (validTestPaths && validTestPaths.length) {
+        return Promise.resolve({tests: toTests(this._context, validTestPaths)});
+      } else if (globalConfig.testPathPattern != null) {
+        return Promise.resolve(
+          this.findMatchingTests(globalConfig.testPathPattern),
+        );
+      } else {
+        return Promise.resolve({tests: []});
+      }
     }
   }
 }