Class TestBedImpl

packages/core/testing/src/test_bed.ts:213–912

 * TestBed is the primary api for writing unit tests for Angular applications and libraries.
 */
export class TestBedImpl implements TestBed {
  private static _INSTANCE: TestBedImpl | null = null;

  static get INSTANCE(): TestBedImpl {
    return (TestBedImpl._INSTANCE = TestBedImpl._INSTANCE || new TestBedImpl());
  }

  /**
   * Teardown options that have been configured at the environment level.
   * Used as a fallback if no instance-level options have been provided.
   */
  private static _environmentTeardownOptions: ModuleTeardownOptions | undefined;

  /**
   * "Error on unknown elements" option that has been configured at the environment level.
   * Used as a fallback if no instance-level option has been provided.
   */
  private static _environmentErrorOnUnknownElementsOption: boolean | undefined;

  /**
   * "Error on unknown properties" option that has been configured at the environment level.
   * Used as a fallback if no instance-level option has been provided.
   */
  private static _environmentErrorOnUnknownPropertiesOption: boolean | undefined;

  /**
   * Teardown options that have been configured at the `TestBed` instance level.
   * These options take precedence over the environment-level ones.
   */
  private _instanceTeardownOptions: ModuleTeardownOptions | undefined;

  /**
   * Defer block behavior option that specifies whether defer blocks will be triggered manually
   * or set to play through.
   */
  private _instanceDeferBlockBehavior = DEFER_BLOCK_DEFAULT_BEHAVIOR;

  /**
   * Animations behavior option that specifies whether animations are enabled or disabled.
   */
  private _instanceAnimationsEnabled = ANIMATIONS_ENABLED_DEFAULT;

  /**
   * "Error on unknown elements" option that has been configured at the `TestBed` instance level.
   * This option takes precedence over the environment-level one.
   */
  private _instanceErrorOnUnknownElementsOption: boolean | undefined;

  /**
   * "Error on unknown properties" option that has been configured at the `TestBed` instance level.
   * This option takes precedence over the environment-level one.
   */
  private _instanceErrorOnUnknownPropertiesOption: boolean | undefined;

  /**
   * Stores the previous "Error on unknown elements" option value,
   * allowing to restore it in the reset testing module logic.
   */