test: add test for progress bar

Author: fernandatoledo

src/ui/progress-bar.test.tsx

@@ -0,0 +1,41 @@
+import { render, screen } from '@testing-library/react-native';
+import React, { createRef } from 'react';
+import { getAnimatedStyle } from 'react-native-reanimated';
+
+import type { ProgressBarRef } from './progress-bar';
+import { ProgressBar } from './progress-bar';
+
+describe('ProgressBar component', () => {
+  it('renders correctly', () => {
+    render(<ProgressBar className="custom-class" />);
+    expect(screen.getByTestId('progress-bar-container')).toBeTruthy();
+  });
+
+  it('sets initial progress correctly', () => {
+    render(<ProgressBar initialProgress={50} />);
+    const progressBar = screen.getByTestId('progress-bar');
+    expect(progressBar.props.style).toEqual(
+      expect.objectContaining({ width: '50%' })
+    );
+  });
+
+  it('setProgress function works correctly', async () => {
+    const finalValue = 75;
+    const progressAnimationDuration = 250;
+    const ref = createRef<ProgressBarRef>();
+    render(<ProgressBar ref={ref} initialProgress={0} />);
+    const progressBar = screen.getByTestId('progress-bar');
+
+    // Call setProgress and check the updated value
+    if (ref.current) {
+      expect(getAnimatedStyle(progressBar)).toMatchObject({ width: '0%' });
+      jest.useFakeTimers();
+      ref.current.setProgress(finalValue);
+      jest.advanceTimersByTime(progressAnimationDuration); // Duration of the animation
+      const updatedProgressBar = await screen.findByTestId('progress-bar');
+      expect(getAnimatedStyle(updatedProgressBar)).toMatchObject({
+        width: `${finalValue}%`,
+      });
+    }
+  });
+});

src/ui/progress-bar.tsx

@@ -43,8 +43,11 @@ export const ProgressBar = forwardRef<ProgressBarRef, Props>(
       };
     });
     return (
-      <View className={twMerge(` bg-[#EAEAEA]`, className)}>
-        <Animated.View style={style} />
+      <View
+        testID={'progress-bar-container'}
+        className={twMerge(` bg-[#EAEAEA]`, className)}
+      >
+        <Animated.View testID={'progress-bar'} style={style} />
       </View>
     );
   }