Function createFileSystemTestApp

src/cdk/schematics/testing/test-case-setup.ts:40–63

(runner: SchematicTestRunner)

 * schematic tree. This would allow us to fully take advantage of the virtual file system.
 */
export async function createFileSystemTestApp(runner: SchematicTestRunner) {
  const hostTree = new HostTree();
  const appTree: UnitTestTree = await createTestApp(runner, {name: 'cdk-testing'}, hostTree);

  // Since the TypeScript compiler API expects all files to be present on the real file system, we
  // map every file in the app tree to a temporary location on the file system.
  appTree.files.forEach(f => writeFile(f, appTree.readContent(f)));

  return {
    appTree,
    writeFile,
  };

  function writeFile(filePath: string, content: string) {
    // Update the temp file system host to reflect the changes in the real file system.
    // This is still necessary since we depend on the real file system for parsing the
    // TypeScript project.
    if (hostTree.exists(filePath)) {
      hostTree.overwrite(filePath, content);
    } else {
      hostTree.create(filePath, content);
    }
  }
}

export async function createTestCaseSetup(
  migrationName: string,