Function createTestCaseSetup

src/cdk/schematics/testing/test-case-setup.ts:65–114

(
  migrationName: string,
  collectionPath: string,
  inputFiles: string[],
)

}

export async function createTestCaseSetup(
  migrationName: string,
  collectionPath: string,
  inputFiles: string[],
) {
  const runner = new SchematicTestRunner('schematics', collectionPath);

  let logOutput = '';
  runner.logger.subscribe(entry => (logOutput += `${entry.message}\n`));
  const {appTree, writeFile} = await createFileSystemTestApp(runner);

  patchDevkitTreeToExposeTypeScript(appTree);

  // Write each test-case input to the file-system. This is necessary because otherwise
  // TypeScript compiler API won't be able to pick up the test cases.
  inputFiles.forEach(inputFilePath => {
    const inputTestName = basename(inputFilePath, extname(inputFilePath));
    const relativePath = `projects/cdk-testing/src/test-cases/${inputTestName}.ts`;
    const inputContent = readFileContent(inputFilePath);

    writeFile(relativePath, inputContent);
  });

  const testAppTsconfigPath = 'projects/cdk-testing/tsconfig.app.json';
  // Parse TypeScript configuration files with JSONC (like the CLI does) as the
  // config files could contain comments or trailing commas
  const testAppTsconfig = parse(appTree.readContent(testAppTsconfigPath), [], {
    allowTrailingComma: true,
  });

  // include all TypeScript files in the project. Otherwise all test input
  // files won't be part of the program and cannot be migrated.
  testAppTsconfig.include.push('src/**/*.ts');

  writeFile(testAppTsconfigPath, JSON.stringify(testAppTsconfig, null, 2));

  const runFixers = async function () {
    // Patch "executePostTasks" to do nothing. This is necessary since
    // we cannot run the node install task in unit tests. Rather we just
    // assert that certain async post tasks are scheduled.
    // TODO(devversion): RxJS version conflicts between angular-devkit and our dev deps.
    runner.engine.executePostTasks = () => EMPTY as any;

    await runner.runSchematic(migrationName, {}, appTree);

    return {logOutput};
  };

  return {runner, appTree, writeFile, runFixers};
}

/**
 * Resolves all test cases for specified path using Bazel's runfile manifest. Note that we