Improve test coverage (#7401)

This patch adds a number of tests for previously untested lines.

packages/flutter/lib/src/widgets/table.dart

@@ -269,7 +269,15 @@ class _TableElement extends RenderObjectElement {
 
   @override
   void removeChildRenderObject(RenderObject child) {
-    assert(_debugWillReattachChildren);
+    assert(() {
+      if (_debugWillReattachChildren)
+        return true;
+      for (Element forgottenChild in _forgottenChildren) {
+        if (forgottenChild.renderObject == child)
+          return true;
+      }
+      return false;
+    });
     TableCellParentData childParentData = child.parentData;
     renderObject.setChild(childParentData.x, childParentData.y, null);
   }

packages/flutter/lib/src/widgets/text_selection.dart

@@ -401,13 +401,13 @@ class _TextSelectionHandleOverlayState extends State<_TextSelectionHandleOverlay
     if (config.selection.isCollapsed)
       return TextSelectionHandleType.collapsed;
 
+    assert(endpoint.direction != null);
     switch (endpoint.direction) {
       case TextDirection.ltr:
         return ltrType;
       case TextDirection.rtl:
         return rtlType;
     }
-    assert(endpoint.direction != null);
     return null;
   }
 }

packages/flutter/lib/src/widgets/ticker_provider.dart

@@ -130,11 +130,9 @@ abstract class SingleTickerProviderStateMixin implements State<dynamic>, TickerP
     if (_ticker != null) {
       if (_ticker.isActive && _ticker.muted)
         description.add('ticker active but muted');
-      else
-      if (_ticker.isActive)
+      else if (_ticker.isActive)
         description.add('ticker active');
-      else
-      if (_ticker.muted)
+      else if (_ticker.muted)
         description.add('ticker inactive and muted');
       else
         description.add('ticker inactive');

packages/flutter/test/material/switch_test.dart

@@ -6,42 +6,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-class TestBoxPainter extends BoxPainter {
-  TestBoxPainter(VoidCallback onChanged): super(onChanged);
-
-  @override
-  void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) { }
-}
-
-class TestDecoration extends Decoration {
-  int listeners = 0;
-
-  @override
-  Decoration lerpFrom(Decoration a, double t) {
-    if (t == 0.0)
-      return a;
-    if (t == 1.0)
-      return this;
-    return new TestDecoration();
-  }
-
-  @override
-  Decoration lerpTo(Decoration b, double t) {
-    if (t == 1.0)
-      return b;
-    if (t == 0.0)
-      return this;
-    return new TestDecoration();
-  }
-
-  @override
-  BoxPainter createBoxPainter([VoidCallback onChanged]) {
-    if (onChanged != null)
-      listeners += 1;
-    return new TestBoxPainter(onChanged);
-  }
-}
-
 void main() {
   testWidgets('Switch can toggle on tap', (WidgetTester tester) async {
     Key switchKey = new UniqueKey();
@@ -71,4 +35,47 @@ void main() {
     await tester.tap(find.byKey(switchKey));
     expect(value, isTrue);
   });
+
+  testWidgets('Switch can drag', (WidgetTester tester) async {
+    bool value = false;
+
+    await tester.pumpWidget(
+      new StatefulBuilder(
+        builder: (BuildContext context, StateSetter setState) {
+          return new Material(
+            child: new Center(
+              child: new Switch(
+                value: value,
+                onChanged: (bool newValue) {
+                  setState(() {
+                    value = newValue;
+                  });
+                }
+              )
+            )
+          );
+        }
+      )
+    );
+
+    expect(value, isFalse);
+
+    await tester.scroll(find.byType(Switch), const Offset(-30.0, 0.0));
+
+    expect(value, isFalse);
+
+    await tester.scroll(find.byType(Switch), const Offset(30.0, 0.0));
+
+    expect(value, isTrue);
+
+    await tester.pump();
+    await tester.scroll(find.byType(Switch), const Offset(30.0, 0.0));
+
+    expect(value, isTrue);
+
+    await tester.pump();
+    await tester.scroll(find.byType(Switch), const Offset(-30.0, 0.0));
+
+    expect(value, isFalse);
+  });
 }

packages/flutter/test/widgets/table_test.dart

@@ -6,6 +6,18 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
+class TestStatefulWidget extends StatefulWidget {
+  TestStatefulWidget({ Key key }) : super(key: key);
+
+  @override
+  TestStatefulWidgetState createState() => new TestStatefulWidgetState();
+}
+
+class TestStatefulWidgetState extends State<TestStatefulWidget> {
+  @override
+  Widget build(BuildContext context) => new Container();
+}
+
 void main() {
   testWidgets('Table widget - control test', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -331,5 +343,159 @@ void main() {
     expect(contexts.length, equals(2));
     expect(contexts[0], equals(contexts[1]));
   });
+
+  testWidgets('Table widget - keyed rows', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      new Table(
+        children: <TableRow>[
+          new TableRow(
+            key: const ValueKey<int>(1),
+            children: <Widget>[
+              new TestStatefulWidget(key: const ValueKey<int>(11)),
+              new TestStatefulWidget(key: const ValueKey<int>(12)),
+            ],
+          ),
+          new TableRow(
+            key: const ValueKey<int>(2),
+            children: <Widget>[
+              new TestStatefulWidget(key: const ValueKey<int>(21)),
+              new TestStatefulWidget(key: const ValueKey<int>(22)),
+            ],
+          ),
+        ]
+      )
+    );
+
+    TestStatefulWidgetState state11 = tester.state(find.byKey(const ValueKey<int>(11)));
+    TestStatefulWidgetState state12 = tester.state(find.byKey(const ValueKey<int>(12)));
+    TestStatefulWidgetState state21 = tester.state(find.byKey(const ValueKey<int>(21)));
+    TestStatefulWidgetState state22 = tester.state(find.byKey(const ValueKey<int>(22)));
+
+    expect(state11.mounted, isTrue);
+    expect(state12.mounted, isTrue);
+    expect(state21.mounted, isTrue);
+    expect(state22.mounted, isTrue);
+
+    await tester.pumpWidget(
+      new Table(
+        children: <TableRow>[
+          new TableRow(
+            key: const ValueKey<int>(2),
+            children: <Widget>[
+              new TestStatefulWidget(key: const ValueKey<int>(21)),
+              new TestStatefulWidget(key: const ValueKey<int>(22)),
+            ],
+          ),
+        ]
+      )
+    );
+
+    expect(state11.mounted, isFalse);
+    expect(state12.mounted, isFalse);
+    expect(state21.mounted, isTrue);
+    expect(state22.mounted, isTrue);
+  });
+
+  testWidgets('Table widget - global key reparenting', (WidgetTester tester) async {
+    GlobalKey key = new GlobalKey();
+    Key tableKey = new UniqueKey();
+
+    await tester.pumpWidget(
+      new Column(
+        children: <Widget> [
+          new Expanded(
+            key: tableKey,
+            child: new Table(
+              children: <TableRow>[
+                new TableRow(
+                  children: <Widget>[
+                    new Container(key: const ValueKey<int>(1)),
+                    new TestStatefulWidget(key: key),
+                    new Container(key: const ValueKey<int>(2)),
+                  ],
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+
+    RenderTable table = tester.renderObject(find.byType(Table));
+    expect(table.row(0).length, 3);
+
+    await tester.pumpWidget(
+      new Column(
+        children: <Widget> [
+          new Expanded(child: new TestStatefulWidget(key: key)),
+          new Expanded(
+            key: tableKey,
+            child: new Table(
+              children: <TableRow>[
+                new TableRow(
+                  children: <Widget>[
+                    new Container(key: const ValueKey<int>(1)),
+                    new Container(key: const ValueKey<int>(2)),
+                  ],
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+
+    expect(tester.renderObject(find.byType(Table)), equals(table));
+    expect(table.row(0).length, 2);
+
+    await tester.pumpWidget(
+      new Column(
+        children: <Widget> [
+          new Expanded(
+            key: tableKey,
+            child: new Table(
+              children: <TableRow>[
+                new TableRow(
+                  children: <Widget>[
+                    new Container(key: const ValueKey<int>(1)),
+                    new TestStatefulWidget(key: key),
+                    new Container(key: const ValueKey<int>(2)),
+                  ],
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+
+    expect(tester.renderObject(find.byType(Table)), equals(table));
+    expect(table.row(0).length, 3);
+
+    await tester.pumpWidget(
+      new Column(
+        children: <Widget> [
+          new Expanded(
+            key: tableKey,
+            child: new Table(
+              children: <TableRow>[
+                new TableRow(
+                  children: <Widget>[
+                    new Container(key: const ValueKey<int>(1)),
+                    new Container(key: const ValueKey<int>(2)),
+                  ],
+                ),
+              ],
+            ),
+          ),
+          new Expanded(child: new TestStatefulWidget(key: key)),
+        ],
+      ),
+    );
+
+    expect(tester.renderObject(find.byType(Table)), equals(table));
+    expect(table.row(0).length, 2);
+  });
+
   // TODO(ianh): Test handling of TableCell object
 }

packages/flutter/test/widgets/ticker_provider_test.dart

@@ -7,10 +7,13 @@ import 'package:flutter/material.dart';
 
 void main() {
   testWidgets('TickerMode', (WidgetTester tester) async {
-    await tester.pumpWidget(new TickerMode(
+    Widget widget = new TickerMode(
       enabled: false,
       child: new LinearProgressIndicator()
-    ));
+    );
+    expect(widget.toString, isNot(throwsException));
+
+    await tester.pumpWidget(widget);
 
     expect(tester.binding.transientCallbackCount, 0);
 
@@ -52,7 +55,10 @@ void main() {
   });
 
   testWidgets('SingleTickerProviderStateMixin can handle not being used', (WidgetTester tester) async {
-    await tester.pumpWidget(new BoringTickerTest());
+    Widget widget = new BoringTickerTest();
+    expect(widget.toString, isNot(throwsException));
+
+    await tester.pumpWidget(widget);
     await tester.pumpWidget(new Container());
     // the test is that this doesn't crash, like it used to...
   });
@@ -66,4 +72,4 @@ class BoringTickerTest extends StatefulWidget {
 class _BoringTickerTestState extends State<BoringTickerTest> with SingleTickerProviderStateMixin {
   @override
   Widget build(BuildContext context) => new Container();
-}
\ No newline at end of file
+}

packages/flutter/test/widgets/title_test.dart

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/widgets.dart';
+
+void main() {
+  testWidgets('toString control test', (WidgetTester tester) async {
+    Widget widget = new Title(
+      color: const Color(0xFF00FF00),
+      title: 'Awesome app',
+    );
+    expect(widget.toString, isNot(throwsException));
+  });
+}

packages/flutter/test/widgets/transitions_test.dart

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/widgets.dart';
+
+void main() {
+  testWidgets('toString control test', (WidgetTester tester) async {
+    Widget widget = new FadeTransition(
+      opacity: kAlwaysCompleteAnimation,
+      child: new Text('Ready'),
+    );
+    expect(widget.toString, isNot(throwsException));
+  });
+}

packages/flutter/test/widgets/unique_widget_test.dart

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/widgets.dart';
+
+class TestUniqueWidget extends UniqueWidget<TestUniqueWidgetState> {
+  TestUniqueWidget({ GlobalKey key }) : super(key: key);
+
+  @override
+  TestUniqueWidgetState createState() => new TestUniqueWidgetState();
+}
+
+class TestUniqueWidgetState extends State<TestUniqueWidget> {
+  @override
+  Widget build(BuildContext context) => new Container();
+}
+
+void main() {
+  testWidgets('Unique widget control test', (WidgetTester tester) async {
+    TestUniqueWidget widget = new TestUniqueWidget(key: new GlobalKey());
+
+    await tester.pumpWidget(widget);
+
+    TestUniqueWidgetState state = widget.currentState;
+
+    expect(state, isNotNull);
+
+    await tester.pumpWidget(new Container(child: widget));
+
+    expect(widget.currentState, equals(state));
+  });
+}