planning

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

@@ -0,0 +1,52 @@
+/* eslint-disable import/first */
+jest.mock('../src/canUsePassiveEventListeners');
+
+import canUsePassiveEventListeners from '../src/canUsePassiveEventListeners';
+import normalizeEventOptions from '../src/normalizeEventOptions';
+
+it('is undefined when event options are undefined', () => {
+  expect(normalizeEventOptions(undefined)).toBe(undefined);
+});
+
+it('is undefined when event options are null', () => {
+  expect(normalizeEventOptions(null)).toBe(undefined);
+});
+
+it('is undefined when event options are false', () => {
+  expect(normalizeEventOptions(false)).toBe(undefined);
+});
+
+describe('when able to use passive event listeners', () => {
+  beforeEach(() => {
+    canUsePassiveEventListeners.mockImplementation(() => true);
+  });
+
+  it('passes the eventOptions object through', () => {
+    expect(normalizeEventOptions({ passive: true }))
+      .toEqual({ passive: true });
+
+    expect(normalizeEventOptions({ capture: true }))
+      .toEqual({ capture: true });
+
+    expect(normalizeEventOptions({ capture: true, passive: true }))
+      .toEqual({ capture: true, passive: true });
+  });
+});
+
+describe('when not able to use passive event listeners', () => {
+  beforeEach(() => {
+    canUsePassiveEventListeners.mockImplementation(() => false);
+  });
+
+  it('is true when the capture option is on', () => {
+    expect(normalizeEventOptions({ capture: true })).toBe(true);
+  });
+
+  it('is false when the capture option is off', () => {
+    expect(normalizeEventOptions({ capture: false })).toBe(false);
+  });
+
+  it('is false when the capture option is missing', () => {
+    expect(normalizeEventOptions({ passive: true })).toBe(false);
+  });
+});