PAINTROID-751: Write Integration tests for EraserTool (#100)

test/integration/eraser_tool_test.dart

@@ -0,0 +1,170 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:paintroid/app.dart';
+import 'package:paintroid/core/tools/tool_data.dart';
+
+import '../utils/test_utils.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  const String testIDStr = String.fromEnvironment('id', defaultValue: '-1');
+  final testID = int.tryParse(testIDStr) ?? testIDStr;
+
+  late Widget sut;
+
+  setUp(() async {
+    sut = ProviderScope(
+      child: App(
+        showOnboardingPage: false,
+      ),
+    );
+  });
+
+  if (testID == -1 || testID == 0) {
+    testWidgets('[ERASER_TOOL]: erase one point ', (WidgetTester tester) async {
+      UIInteraction.initialize(tester);
+      await tester.pumpWidget(sut);
+      await UIInteraction.createNewImage();
+      UIInteraction.setColor(Colors.black);
+      await UIInteraction.selectTool(ToolData.BRUSH.name);
+
+      var color = await UIInteraction.getPixelColor(
+        CanvasPosition.centerX,
+        CanvasPosition.centerY,
+      );
+      expect(color, Colors.transparent);
+
+      await UIInteraction.tapAt(CanvasPosition.center);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.black);
+
+      await UIInteraction.selectTool(ToolData.ERASER.name);
+      await UIInteraction.tapAt(CanvasPosition.center);
+
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+    });
+  }
+
+  if (testID == -1 || testID == 1) {
+    testWidgets('[ERASER_TOOL]: eraser erases multiple points',
+        (WidgetTester tester) async {
+      UIInteraction.initialize(tester);
+      await tester.pumpWidget(sut);
+      await UIInteraction.createNewImage();
+      UIInteraction.setColor(Colors.black);
+      await UIInteraction.selectTool(ToolData.BRUSH.name);
+
+      await UIInteraction.tapAt(CanvasPosition.center);
+      await UIInteraction.tapAt(CanvasPosition.topCenter);
+      await UIInteraction.tapAt(CanvasPosition.bottomCenter);
+
+      var color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.black);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.top);
+      expect(color, Colors.black);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.bottom);
+      expect(color, Colors.black);
+
+      await UIInteraction.selectTool(ToolData.ERASER.name);
+      await UIInteraction.tapAt(CanvasPosition.center);
+
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.top);
+      expect(color, Colors.black);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.bottom);
+      expect(color, Colors.black);
+    });
+  }
+
+  if (testID == -1 || testID == 2) {
+    testWidgets('[ERASER_TOOL]: eraser undo and redo functionality',
+        (WidgetTester tester) async {
+      UIInteraction.initialize(tester);
+      await tester.pumpWidget(sut);
+      await UIInteraction.createNewImage();
+      UIInteraction.setColor(Colors.black);
+      await UIInteraction.selectTool(ToolData.BRUSH.name);
+
+      await UIInteraction.tapAt(CanvasPosition.center);
+      var color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.black);
+
+      await UIInteraction.selectTool(ToolData.ERASER.name);
+      await UIInteraction.tapAt(CanvasPosition.center);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+
+      await UIInteraction.clickUndo();
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.black);
+
+      await UIInteraction.clickRedo();
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+    });
+  }
+
+  if (testID == -1 || testID == 3) {
+    testWidgets('[ERASER_TOOL]: eraser does not affect empty canvas',
+        (WidgetTester tester) async {
+      UIInteraction.initialize(tester);
+      await tester.pumpWidget(sut);
+      await UIInteraction.createNewImage();
+      await UIInteraction.selectTool(ToolData.ERASER.name);
+
+      var color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+
+      await UIInteraction.tapAt(CanvasPosition.center);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+    });
+  }
+
+  if (testID == -1 || testID == 4) {
+    testWidgets('[ERASER_TOOL]: eraser erases with drag gesture',
+        (WidgetTester tester) async {
+      UIInteraction.initialize(tester);
+      await tester.pumpWidget(sut);
+      await UIInteraction.createNewImage();
+      UIInteraction.setColor(Colors.black);
+      await UIInteraction.selectTool(ToolData.BRUSH.name);
+
+      await UIInteraction.dragFromTo(
+          CanvasPosition.centerLeft, CanvasPosition.centerRight);
+      var color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.black);
+
+      await UIInteraction.selectTool(ToolData.ERASER.name);
+
+      await UIInteraction.dragFromTo(
+          CanvasPosition.center, CanvasPosition.centerRight);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.centerX, CanvasPosition.centerY);
+      expect(color, Colors.transparent);
+      color = await UIInteraction.getPixelColor(
+          CanvasPosition.halfwayLeft, CanvasPosition.centerY);
+      expect(color, Colors.black);
+    });
+  }
+}