Add event-drag test

package.json

@@ -24,7 +24,7 @@
   "homepage": "https://github.com/hoangnm/react-native-week-view#readme",
   "scripts": {
     "lint": "eslint ./src *.js",
-    "test": "jest ./src"
+    "test": "jest"
   },
   "dependencies": {
     "memoize-one": "^5.1.1",

src/Event/Event.js

@@ -109,6 +109,7 @@ const Event = ({
 
   const dragGesture = Gesture.Pan()
     .enabled(isDragEnabled)
+    .withTestId('dragGesture')
     .onTouchesDown(() => {
       isDragging.value = true;
     })

src/__tests__/Event.test.js

@@ -0,0 +1,40 @@
+import 'react-native';
+import React from 'react';
+import {
+  fireGestureHandler,
+  getByGestureTestId,
+} from 'react-native-gesture-handler/jest-utils';
+import { render } from '@testing-library/react-native';
+import Event from '../Event/Event';
+
+describe('onDrag handler', () => {
+  const buildDragGesture = () => [
+    // {}, // implicit BEGIN state
+    { translationX: 3, translationY: 21 }, // ACTIVE state
+    { translationX: 20, translationY: -3 }, // ACTIVE state
+    { translationX: 7, translationY: 52 }, // --> last ACTIVE position
+    // {}, // implicit END state
+  ];
+
+  it('Calls onDrag with new position', () => {
+    const mockEvent = {
+      id: 1,
+      description: 'some description',
+      color: 'red',
+      startDate: new Date(2021, 1, 3, 12, 0),
+      endDate: new Date(2021, 1, 3, 12, 2),
+    };
+    const onDragMock = jest.fn(() => null);
+    const position = { top: 10, left: 0, width: 40, height: 50 };
+
+    render(<Event event={mockEvent} onDrag={onDragMock} position={position} />);
+    fireGestureHandler(getByGestureTestId('dragGesture'), buildDragGesture());
+
+    expect(onDragMock).toHaveBeenCalledTimes(1);
+    expect(onDragMock).toHaveBeenCalledWith(
+      mockEvent,
+      position.left + position.width / 2 + 7,
+      position.top + 52,
+    );
+  });
+});