✅ (StopHOC) test event handling

Author: tpucci

src/__tests__/StopHOC.test.tsx

@@ -0,0 +1,43 @@
+import React from 'react';
+import { of } from 'rxjs';
+import { View } from 'react-native';
+import TestRenderer from 'react-test-renderer';
+
+import { StopHOC } from '../StopHOC';
+import { Navigation } from '../Navigation';
+
+describe('StopHOC', () => {
+  it('creates a Component which pipes back events and filter them based on name', () => {
+    const spy = jest.fn();
+    const initialEvent = { target: 'myComponent' };
+    const back$ = of(initialEvent);
+    const Stop = StopHOC({ back$ }, undefined, 'myComponent', View, undefined);
+    const testRenderer = TestRenderer.create(<Stop />);
+    testRenderer.root.instance.back$.subscribe(spy);
+    expect(spy).toHaveBeenCalledWith(initialEvent);
+  });
+
+  it('creates a Component which pipes back events and filter them out based on name', () => {
+    const spy = jest.fn();
+    const initialEvent = { target: 'notMyComponent' };
+    const back$ = of(initialEvent);
+    const Stop = StopHOC({ back$ }, undefined, 'myComponent', View, undefined);
+    const testRenderer = TestRenderer.create(<Stop />);
+    testRenderer.root.instance.back$.subscribe(spy);
+    expect(spy).not.toHaveBeenCalled();
+  });
+
+  it('creates a Component which register the onBack side effect in the Navigation\'s BackHandlerDelegate', () => {
+    const onBackSpy = jest.fn();
+    const setOnBackCallbackSpy = jest.spyOn(
+      Navigation.instance.backHandlerDelegate,
+      'setOnBackCallback'
+    );
+    const initialEvent = { target: 'myComponent' };
+    const back$ = of(initialEvent);
+    const Stop = StopHOC({ back$ }, onBackSpy, 'myComponent', View, undefined);
+    const testRenderer = TestRenderer.create(<Stop />);
+    testRenderer.root.instance.back$.subscribe();
+    expect(setOnBackCallbackSpy).toHaveBeenCalledWith(onBackSpy);
+  });
+});