skip certain tests when installing yarn ignoring the lockfile

.github/workflows/test.yml

@@ -27,3 +27,5 @@ jobs:
           no-lockfile: ${{ inputs.no-lockfile }}
       - name: Run Jest Tests
         run: yarn jest --ci --maxWorkers 4 --reporters=default --reporters=jest-junit --rootdir='./'
+        env:
+          YARN_INSTALL_NO_LOCKFILE: ${{ inputs.no-lockfile }}

package.json

@@ -86,6 +86,9 @@
     "setupFiles": [
       "<rootDir>/scripts/setupJest.js"
     ],
+    "setupFilesAfterEnv": [
+      "<rootDir>/scripts/setupJestAfterEnv.js"
+    ],
     "watchPlugins": [
       "jest-watch-typeahead/filename",
       "jest-watch-typeahead/testname"

scripts/__tests__/babel-lib-defs-test.js

@@ -13,12 +13,15 @@
 import generateBabelFlowLibraryDefinitions from '../support/generateBabelFlowLibraryDefinitions';
 import {promises as fsPromises} from 'fs';
 
-test('Babel Flow library definitions should be up to date', async () => {
-  // Run `yarn update-babel-flow-lib-defs` in the Metro monorepo if this test fails.
-  const contentByFilePath = await generateBabelFlowLibraryDefinitions();
-  expect(contentByFilePath).toBeInstanceOf(Map);
-  expect(contentByFilePath.size).toBe(2);
-  for (const [filePath, content] of contentByFilePath) {
-    expect(await fsPromises.readFile(filePath, 'utf8')).toEqual(content);
-  }
-});
+test.skipOnYarnInstallNoLockfile(
+  'Babel Flow library definitions should be up to date',
+  async () => {
+    // Run `yarn update-babel-flow-lib-defs` in the Metro monorepo if this test fails.
+    const contentByFilePath = await generateBabelFlowLibraryDefinitions();
+    expect(contentByFilePath).toBeInstanceOf(Map);
+    expect(contentByFilePath.size).toBe(2);
+    for (const [filePath, content] of contentByFilePath) {
+      expect(await fsPromises.readFile(filePath, 'utf8')).toEqual(content);
+    }
+  },
+);

scripts/setupJestAfterEnv.js

@@ -0,0 +1,15 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @oncall react_native
+ */
+
+'use strict';
+
+test.skipOnYarnInstallNoLockfile = process.env.YARN_INSTALL_NO_LOCKFILE
+  ? test.skip
+  : test;