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test/custom_social_share_method_channel_test.dart

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+import 'package:custom_social_share/src/custom_social_share_method_channel.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  MethodChannelCustomSocialShare platform = MethodChannelCustomSocialShare();
+  const MethodChannel channel = MethodChannel('custom_social_share');
+
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  setUp(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
+      return true;
+    });
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(channel, null);
+  });
+
+  test('toAll', () async {
+    expect(await platform.toAll('success'), true);
+  });
+}

test/custom_social_share_test.dart

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+import 'package:custom_social_share/src/custom_social_share.dart';
+import 'package:custom_social_share/src/custom_social_share_method_channel.dart';
+import 'package:custom_social_share/src/custom_social_share_platform_interface.dart';
+import 'package:custom_social_share/src/enums.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+class MockCustomSocialSharePlatform
+    with MockPlatformInterfaceMixin
+    implements CustomSocialSharePlatform {
+  @override
+  Future<bool> copy(String content) => Future.value(content == 'success');
+
+  @override
+  Future<bool> toAll(String content) => Future.value(content == 'success');
+
+  @override
+  Future<bool> to(ShareWith shareWith, String content) =>
+      Future.value(ShareWith.sms == shareWith && content == 'success');
+
+  @override
+  Future<List<ShareWith>> getInstalledAppsForShare() =>
+      Future.value([ShareWith.sms, ShareWith.email]);
+
+  @override
+  Future<bool> customApp(String package, String content) => Future.value(
+      package == 'com.google.android.apps.dynamite' && content == 'success');
+}
+
+void main() {
+  final CustomSocialSharePlatform initialPlatform =
+      CustomSocialSharePlatform.instance;
+
+  test('$MethodChannelCustomSocialShare is the default instance', () {
+    expect(initialPlatform, isInstanceOf<MethodChannelCustomSocialShare>());
+  });
+
+  test('getPlatformVersion', () async {
+    CustomSocialShare customSocialSharePlugin = CustomSocialShare();
+    MockCustomSocialSharePlatform fakePlatform =
+        MockCustomSocialSharePlatform();
+    CustomSocialSharePlatform.instance = fakePlatform;
+
+    expect(await customSocialSharePlugin.toAll('success'), true);
+    expect(await customSocialSharePlugin.toAll('other'), false);
+
+    expect(await customSocialSharePlugin.to(ShareWith.sms, 'success'), true);
+    expect(await customSocialSharePlugin.to(ShareWith.email, 'other'), false);
+
+    expect(await customSocialSharePlugin.getInstalledAppsForShare(),
+        [ShareWith.sms, ShareWith.email]);
+
+    expect(
+        await customSocialSharePlugin.customApp(
+            'com.google.android.apps.dynamite', 'success'),
+        true);
+    expect(
+        await customSocialSharePlugin.customApp('com.google.android', 'other'),
+        false);
+  });
+}