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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);
+  });
+}