test: add shard e2e test

e2e/__tests__/shard.test.ts

@@ -0,0 +1,52 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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.
+ */
+import * as path from 'path';
+import runJest from '../runJest';
+
+test('--shard=1/1', () => {
+  const result = runJest('shard', ['--shard=1/1', '--listTests']);
+
+  const paths = result.stdout
+    .split('\n')
+    .filter(Boolean)
+    .map(file => path.basename(file));
+
+  expect(paths).toEqual(['3.test.js', '2.test.js', '1.test.js']);
+});
+
+test('--shard=1/2', () => {
+  const result = runJest('shard', ['--shard=1/2', '--listTests']);
+
+  const paths = result.stdout
+    .split('\n')
+    .filter(Boolean)
+    .map(file => path.basename(file));
+
+  expect(paths).toEqual(['2.test.js', '1.test.js']);
+});
+
+test('--shard=2/2', () => {
+  const result = runJest('shard', ['--shard=2/2', '--listTests']);
+
+  const paths = result.stdout
+    .split('\n')
+    .filter(Boolean)
+    .map(file => path.basename(file));
+
+  expect(paths).toEqual(['3.test.js']);
+});
+
+test('--shard=4/4', () => {
+  const result = runJest('shard', ['--shard=4/4', '--listTests']);
+
+  const paths = result.stdout
+    .split('\n')
+    .filter(Boolean)
+    .map(file => path.basename(file));
+
+  expect(paths).toEqual([]);
+});

e2e/shard/__tests__/1.test.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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';
+
+test('1-1', () => expect(2).toBe(2));
+
+test('1-2', () => expect(2).toBe(2));
+
+test('1-3', () => expect(2).toBe(2));

e2e/shard/__tests__/2.test.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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';
+
+test('2-1', () => expect(2).toBe(2));
+
+test('2-2', () => expect(2).toBe(2));
+
+test('2-3', () => expect(2).toBe(2));

e2e/shard/__tests__/3.test.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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';
+
+test('3-1', () => expect(2).toBe(2));
+
+test('3-2', () => expect(2).toBe(2));
+
+test('3-3', () => expect(2).toBe(2));

e2e/shard/package.json

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+{
+  "jest": {
+    "testEnvironment": "node"
+  }
+}