import { Tree } from '@angular-devkit/schematics';
import {
  SchematicTestRunner,
  UnitTestTree,
} from '@angular-devkit/schematics/testing';

/** Create a base app used for testing. */
export async function createTestApp(
  runner: SchematicTestRunner,
  appOptions = {},
  tree?: Tree
): Promise<UnitTestTree> {
  const workspaceTree = await runner
    .runExternalSchematicAsync(
      '@schematics/angular',
      'workspace',
      {
        name: 'workspace',
        version: '6.0.0',
        newProjectRoot: 'projects',
      },
      tree
    )
    .toPromise();

  return runner
    .runExternalSchematicAsync(
      '@schematics/angular',
      'application',
      { name: 'shallow-render', ...appOptions },
      workspaceTree
    )
    .toPromise();
}