Improve test coverage for material.dart (#4776)

Previously these widget had zero test coverage. Also, improve the
coverage tooling Mac.

packages/flutter/test/material/chip_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/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Chip control test', (WidgetTester tester) async {
+    bool didDeleteChip = false;
+    await tester.pumpWidget(
+      new MaterialApp(
+        home: new Material(
+          child: new Center(
+            child: new Chip(
+              avatar: new CircleAvatar(
+                child: new Text('C')
+              ),
+              label: new Text('Chip'),
+              onDeleted: () {
+                didDeleteChip = true;
+              }
+            )
+          )
+        )
+      )
+    );
+
+    expect(didDeleteChip, isFalse);
+    await tester.tap(find.byType(Tooltip));
+    expect(didDeleteChip, isTrue);
+  });
+}

packages/flutter/test/material/divider_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/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Divider control test', (WidgetTester tester) async {
+    await tester.pumpWidget(new Center(child: new Divider()));
+    RenderBox box = tester.firstRenderObject(find.byType(Divider));
+    expect(box.size.height, 15.0);
+  });
+}

packages/flutter/test/material/drawer_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/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Drawer control test', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      new Scaffold(
+        drawer: new Drawer(
+          child: new Block(
+            children: <Widget>[
+              new DrawerHeader(
+                content: new Text('header')
+              ),
+              new DrawerItem(
+                icon: new Icon(Icons.archive),
+                child: new Text('Archive')
+              )
+            ]
+          )
+        )
+      )
+    );
+
+    expect(find.text('Archive'), findsNothing);
+    ScaffoldState state = tester.firstState(find.byType(Scaffold));
+    state.openDrawer();
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1));
+    expect(find.text('Archive'), findsOneWidget);
+  });
+}

packages/flutter/test/material/floating_action_button_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/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Floating Action Button control test', (WidgetTester tester) async {
+    bool didPressButton = false;
+    await tester.pumpWidget(
+      new Center(
+        child: new FloatingActionButton(
+          onPressed: () {
+            didPressButton = true;
+          },
+          child: new Icon(Icons.add)
+        )
+      )
+    );
+
+    expect(didPressButton, isFalse);
+    await tester.tap(find.byType(Icon));
+    expect(didPressButton, isTrue);
+  });
+}

packages/flutter/test/material/icon_data_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/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('IconData object test', (WidgetTester tester) async {
+    expect(Icons.account_balance, isNot(equals(Icons.account_box)));
+    expect(Icons.account_balance.hashCode, isNot(equals(Icons.account_box.hashCode)));
+    expect(Icons.account_balance, hasOneLineDescription);
+  });
+}

packages/flutter_tools/lib/src/commands/test.dart

@@ -30,7 +30,7 @@ class TestCommand extends FlutterCommand {
       defaultsTo: false,
       negatable: false,
       help: 'Whether to merge converage data with "coverage/lcov.base.info". '
-            'Implies collecting coverage data. (Linux only)'
+            'Implies collecting coverage data. (Requires lcov)'
     );
     argParser.addOption('coverage-path',
       defaultsTo: 'coverage/lcov.info',
@@ -95,6 +95,8 @@ class TestCommand extends FlutterCommand {
     Status status = logger.startProgress('Collecting coverage information...');
     String coverageData = await collector.finalizeCoverage();
     status.stop(showElapsedTime: true);
+    if (coverageData == null)
+      return false;
 
     String coveragePath = argResults['coverage-path'];
     File coverageFile = new File(coveragePath)
@@ -118,10 +120,12 @@ class TestCommand extends FlutterCommand {
       }
 
       if (os.which('lcov') == null) {
-        printError(
-          'Missing "lcov" tool. Unable to merge coverage data.\n'
-          'Consider running "sudo apt-get install lcov".'
-        );
+        String installMessage = 'Please install lcov.';
+        if (os.isLinux)
+          installMessage = 'Consider running "sudo apt-get install lcov".';
+        else if (os.isMacOS)
+          installMessage = 'Consider running "brew install lcov".';
+        printError('Missing "lcov" tool. Unable to merge coverage data.\n$installMessage');
         return false;
       }
 

packages/flutter_tools/lib/src/test/coverage_collector.dart

@@ -62,6 +62,8 @@ class CoverageCollector {
     assert(enabled);
     await finishPendingJobs();
     printTrace('formating coverage data');
+    if (_globalHitmap == null)
+      return null;
     Resolver resolver = new Resolver(packagesPath: PackageMap.globalPackagesPath);
     LcovFormatter formater = new LcovFormatter(resolver);
     String packagePath = Directory.current.path;