[path_provider] Add missing tests

packages/path_provider/CHANGELOG.md

@@ -1,3 +1,9 @@
+## 1.2.2
+
+* Correct the integration test for Android's `getApplicationSupportDirectory` call.
+* Introduce `setMockPathProviderPlatform` for API for tests.
+* Adds missing unit and integration tests.
+
 ## 1.2.1
 
 * Fix fall through bug.

packages/path_provider/example/test_driver/path_provider.dart

@@ -36,18 +36,13 @@ void main() {
   });
 
   test('getApplicationSupportDirectory', () async {
-    if (Platform.isIOS) {
-      final Directory result = await getApplicationSupportDirectory();
-      final String uuid = Uuid().v1();
-      final File file = File('${result.path}/$uuid.txt');
-      file.writeAsStringSync('Hello world!');
-      expect(file.readAsStringSync(), 'Hello world!');
-      expect(result.listSync(), isNotEmpty);
-      file.deleteSync();
-    } else if (Platform.isAndroid) {
-      final Future<Directory> result = getApplicationSupportDirectory();
-      expect(result, throwsA(isInstanceOf<UnsupportedError>()));
-    }
+    final Directory result = await getApplicationSupportDirectory();
+    final String uuid = Uuid().v1();
+    final File file = File('${result.path}/$uuid.txt');
+    file.writeAsStringSync('Hello world!');
+    expect(file.readAsStringSync(), 'Hello world!');
+    expect(result.listSync(), isNotEmpty);
+    file.deleteSync();
   });
 
   test('getExternalStorageDirectory', () async {

packages/path_provider/lib/path_provider.dart

@@ -3,13 +3,22 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io';
+import 'dart:io' show Directory;
 
 import 'package:flutter/services.dart';
+import 'package:meta/meta.dart';
+import 'package:platform/platform.dart';
 
 const MethodChannel _channel =
     MethodChannel('plugins.flutter.io/path_provider');
 
+Platform _platform = const LocalPlatform();
+
+@visibleForTesting
+void setMockPathProviderPlatform(Platform platform) {
+  _platform = platform;
+}
+
 /// Path to the temporary directory on the device that is not backed up and is
 /// suitable for storing caches of downloaded files.
 ///
@@ -77,7 +86,7 @@ Future<Directory> getApplicationDocumentsDirectory() async {
 ///
 /// On Android this uses the `getExternalFilesDir(null)`.
 Future<Directory> getExternalStorageDirectory() async {
-  if (Platform.isIOS)
+  if (_platform.isIOS)
     throw UnsupportedError("Functionality not available on iOS");
   final String path =
       await _channel.invokeMethod<String>('getStorageDirectory');

packages/path_provider/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for getting commonly used locations on the Android &
   iOS file systems, such as the temp and app data directories.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/path_provider
-version: 1.2.1
+version: 1.2.2
 
 flutter:
   plugin:
@@ -14,6 +14,8 @@ flutter:
 dependencies:
   flutter:
     sdk: flutter
+  platform: ^2.0.0
+  meta: ^1.0.5
 
 dev_dependencies:
   flutter_test:

packages/path_provider/test/path_provider_test.dart

@@ -7,6 +7,7 @@ import 'dart:io';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:path_provider/path_provider.dart';
+import 'package:platform/platform.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
@@ -21,6 +22,10 @@ void main() {
     return response;
   });
 
+  setUp(() {
+    setMockPathProviderPlatform(FakePlatform(operatingSystem: 'android'));
+  });
+
   tearDown(() {
     log.clear();
   });
@@ -35,6 +40,18 @@ void main() {
     expect(directory, isNull);
   });
 
+  test('getApplicationSupportDirectory test', () async {
+    response = null;
+    final Directory directory = await getApplicationSupportDirectory();
+    expect(
+      log,
+      <Matcher>[
+        isMethodCall('getApplicationSupportDirectory', arguments: null)
+      ],
+    );
+    expect(directory, isNull);
+  });
+
   test('getApplicationDocumentsDirectory test', () async {
     response = null;
     final Directory directory = await getApplicationDocumentsDirectory();
@@ -47,17 +64,53 @@ void main() {
     expect(directory, isNull);
   });
 
+  test('getExternalStorageDirectory test', () async {
+    response = null;
+    final Directory directory = await getExternalStorageDirectory();
+    expect(
+      log,
+      <Matcher>[isMethodCall('getStorageDirectory', arguments: null)],
+    );
+    expect(directory, isNull);
+  });
+
+  test('getExternalStorageDirectory iOS test', () async {
+    setMockPathProviderPlatform(FakePlatform(operatingSystem: 'ios'));
+
+    response = null;
+    try {
+      await getExternalStorageDirectory();
+      fail('should throw UnsupportedError');
+    } catch (e) {
+      expect(e, isUnsupportedError);
+    }
+  });
+
   test('TemporaryDirectory path test', () async {
     final String fakePath = "/foo/bar/baz";
     response = fakePath;
     final Directory directory = await getTemporaryDirectory();
     expect(directory.path, equals(fakePath));
   });
 
+  test('ApplicationSupportDirectory path test', () async {
+    final String fakePath = "/foo/bar/baz";
+    response = fakePath;
+    final Directory directory = await getApplicationSupportDirectory();
+    expect(directory.path, equals(fakePath));
+  });
+
   test('ApplicationDocumentsDirectory path test', () async {
     final String fakePath = "/foo/bar/baz";
     response = fakePath;
     final Directory directory = await getApplicationDocumentsDirectory();
     expect(directory.path, equals(fakePath));
   });
+
+  test('ExternalStorageDirectory path test', () async {
+    final String fakePath = "/foo/bar/baz";
+    response = fakePath;
+    final Directory directory = await getExternalStorageDirectory();
+    expect(directory.path, equals(fakePath));
+  });
 }