planning

node_modules/consolidated-events/__tests__/index-test.js

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+import { addEventListener } from '../src';
+import TargetEventHandlers from '../src/TargetEventHandlers';
+
+class MockTarget {
+  constructor() {
+    this.addEventListener = jest.fn();
+  }
+}
+
+const EVENT_HANDLERS_KEY = '__consolidated_events_handlers__';
+
+describe('addEventListener()', () => {
+  it('initializes an instance of TargetEventHandlers on new targets', () => {
+    const target = new MockTarget();
+    addEventListener(target, 'scroll', () => {});
+    expect(target[EVENT_HANDLERS_KEY]).toBeInstanceOf(TargetEventHandlers);
+    expect(target[EVENT_HANDLERS_KEY].target).toBe(target);
+  });
+
+  it('normalizes event options', () => {
+    const target = new MockTarget();
+    addEventListener(target, 'scroll', () => {}, { capture: true });
+
+    expect(target.addEventListener)
+      .toHaveBeenCalledWith('scroll', jasmine.any(Function), true);
+  });
+
+  it('returns an unsubscribe function', () => {
+    const target = new MockTarget();
+    const remove = addEventListener(target, 'scroll', () => {}, { capture: true });
+
+    expect(typeof remove).toBe('function');
+  });
+});