Add failing test

Author: angelosilvestre

test_goldens/failure_reporting/failure_reporting_test.dart

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+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test_goldens/flutter_test_goldens.dart';
+import 'package:flutter_test_goldens/golden_bricks.dart';
+
+void main() {
+  testGoldenScene('reports multiple failures', (tester) async {
+    await Gallery(
+      tester,
+      directory: Directory("./goldens"),
+      fileName: "multiple_failures",
+      sceneDescription: "Multiple Failures",
+      layout: SceneLayout.column,
+    )
+        .itemFromWidget(
+          id: '1',
+          description: 'Red Rectangle',
+          // Use _buildGoldenRectangle to build the original golden rectangle.
+          widget: _buildMismatchRectangle(),
+        )
+        .itemFromWidget(
+          id: '2',
+          description: 'A text',
+          // Use _buildGoldenText to build the original golden text.
+          widget: _buildMismatchText(),
+        )
+        // The following item is present in the golden file.
+        // .itemFromWidget(
+        //   id: '3',
+        //   description: 'Another Red Rectangle',
+        //   widget: _buildGoldenRectangle(),
+        // )
+        //
+        // The following item is not present in the golden file.
+        .itemFromWidget(
+          id: '4',
+          description: 'An unexpected Rectangle',
+          widget: _buildGoldenRectangle(),
+        )
+        .renderOrCompareGolden();
+  });
+}
+
+/// The widget used to build the original golden rectangle.
+Widget _buildGoldenRectangle() {
+  return Container(
+    width: 150,
+    height: 100,
+    color: Colors.red,
+  );
+}
+
+/// The widget used to build the mismatch rectangle.
+///
+/// It has the same same size as the golden rectangle but a different color.
+Widget _buildMismatchRectangle() {
+  return Container(
+    width: 150,
+    height: 100,
+    color: Colors.green,
+  );
+}
+
+/// The widget used to build the original golden text.
+// ignore: unused_element
+Widget _buildGoldenText() {
+  return Text(
+    'A text widget',
+    style: TextStyle(
+      fontFamily: goldenBricks,
+    ),
+  );
+}
+
+/// The widget used to build the mismatch golden text.
+///
+/// It has the same text but all uppercase.
+Widget _buildMismatchText() {
+  return Text(
+    'A TEXT WIDGET',
+    style: TextStyle(
+      fontFamily: goldenBricks,
+    ),
+  );
+}