feat(useOrientation): add tests

tests/useOrientation.test.ts

@@ -0,0 +1,68 @@
+import { act, renderHook } from '@testing-library/react-hooks';
+import { replaceRaf } from 'raf-stub';
+import useOrientation from '../src/useOrientation';
+import { isClient } from '../src/util';
+
+declare var requestAnimationFrame: {
+  reset: () => void;
+  step: (steps?: number, duration?: number) => void;
+};
+
+describe('useOrientation', () => {
+  beforeAll(() => {
+    replaceRaf();
+    (window.screen.orientation as object) = {
+      type: 'landscape-primary',
+      angle: 0,
+    };
+  });
+
+  afterEach(() => {
+    requestAnimationFrame.reset();
+  });
+
+  it('should be defined', () => {
+    expect(useOrientation).toBeDefined();
+  });
+
+  function getHook(...args) {
+    return renderHook(() => useOrientation(...args));
+  }
+
+  function triggerOrientation(type: string, angle: number) {
+    (window.screen.orientation.type as string) = type;
+    (window.screen.orientation.angle as number) = angle;
+    
+    window.dispatchEvent(new Event('orientationchange'));
+  }
+
+  it('should return current window orientation', () => {
+    const hook = getHook();
+
+    expect(typeof hook.result.current).toBe('object');
+    expect(typeof hook.result.current.type).toBe('string');
+    expect(typeof hook.result.current.angle).toBe('number');
+  });
+
+  it('should use passed parameters as initial values in case of non-browser use', () => {
+    const hook = getHook({
+      angle: 90,
+      type: 'portrait-primary'
+    });
+
+    expect(hook.result.current.type).toBe(isClient ? window.screen.orientation.type : 'portrait-primary');
+    expect(hook.result.current.angle).toBe(isClient ? window.screen.orientation.angle : 90);
+  });
+
+  it('should re-render after orientation change on closest RAF', () => {
+    const hook = getHook();
+
+    act(() => {
+      triggerOrientation('portrait-secondary', 180);
+      requestAnimationFrame.step();
+    });
+
+    expect(hook.result.current.type).toBe('portrait-secondary');
+    expect(hook.result.current.angle).toBe(180);
+  });
+});