feat(cdk-experimental/testing): Add a public stabilize method to

TestElement

Author: mmalerba

src/cdk-experimental/testing/protractor/protractor-element.ts

@@ -136,4 +136,6 @@ export class ProtractorElement implements TestElement {
     const {x: left, y: top} = await this.element.getLocation();
     return {width, height, left, top};
   }
+
+  async stabilize(): Promise<void> {}
 }

src/cdk-experimental/testing/test-element.ts

@@ -101,4 +101,11 @@ export interface TestElement {
 
   /** Gets the dimensions of the element. */
   getDimensions(): Promise<ElementDimensions>;
+
+  /**
+   * Flushes change detection and async tasks.
+   * In most cases it should not be necessary to call this. However, there may be some edge cases
+   * where it is needed to fully flush animation events.
+   */
+  stabilize(): Promise<void>;
 }

src/cdk-experimental/testing/testbed/unit-test-element.ts

@@ -139,4 +139,8 @@ export class UnitTestElement implements TestElement {
     await this._stabilize();
     return this.element.getBoundingClientRect();
   }
+
+  async stabilize(): Promise<void> {
+    return this._stabilize();
+  }
 }