diff --git a/lib/src/http_certificate_pinning.dart b/lib/src/http_certificate_pinning.dart
index ae5a98c..6c704ad 100644
--- a/lib/src/http_certificate_pinning.dart
+++ b/lib/src/http_certificate_pinning.dart
@@ -27,7 +27,7 @@ class HttpCertificatePinning {
     final Map<String, dynamic> params = <String, dynamic>{
       "url": serverURL,
       "headers": headerHttp ?? {},
-      "type": sha.toString().split(".").last,
+      "type": sha.name,
       "fingerprints":
           allowedSHAFingerprints.map((a) => a.replaceAll(":", "")).toList(),
       "timeout": timeout
diff --git a/test/src/http_certificate_pinning_test.dart b/test/src/http_certificate_pinning_test.dart
new file mode 100644
index 0000000..f6a77e1
--- /dev/null
+++ b/test/src/http_certificate_pinning_test.dart
@@ -0,0 +1,104 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http_certificate_pinning/http_certificate_pinning.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('HttpCertificatePinning', () {
+    const MethodChannel channel = MethodChannel('http_certificate_pinning');
+    final List<MethodCall> log = <MethodCall>[];
+
+    setUp(() {
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(channel, (MethodCall methodCall) async {
+        log.add(methodCall);
+        if (methodCall.method == 'check') {
+          return 'SUCCESS';
+        }
+        return null;
+      });
+      log.clear();
+    });
+
+    tearDown(() {
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(channel, null);
+    });
+
+    test('check method invokes with correct arguments', () async {
+      const String testUrl = 'https://example.com';
+      const SHA testSha = SHA.SHA256;
+      const List<String> testFingerprints = ['AA:BB:CC:DD:EE:FF', '11:22:33:44:55:66'];
+      final Map<String, String> testHeaders = {'Authorization': 'Bearer token'};
+      const int testTimeout = 10000;
+
+      await HttpCertificatePinning.check(
+        serverURL: testUrl,
+        sha: testSha,
+        allowedSHAFingerprints: testFingerprints,
+        headerHttp: testHeaders,
+        timeout: testTimeout,
+      );
+
+      expect(log, hasLength(1));
+      expect(log.first.method, 'check');
+      expect(log.first.arguments, <String, dynamic>{
+        'url': testUrl,
+        'headers': testHeaders,
+        'type': 'SHA256',
+        'fingerprints': ['AABBCCDDEEFF', '112233445566'],
+        'timeout': testTimeout,
+      });
+    });
+
+    test('check method handles null headers and timeout gracefully', () async {
+      const String testUrl = 'https://example.com';
+      const List<String> testFingerprints = ['AA:BB:CC:DD:EE:FF'];
+
+      await HttpCertificatePinning.check(
+        serverURL: testUrl,
+        sha: SHA.SHA1,
+        allowedSHAFingerprints: testFingerprints,
+        headerHttp: null,
+        timeout: null,
+      );
+
+      expect(log, hasLength(1));
+      expect(log.first.method, 'check');
+      expect(log.first.arguments, <String, dynamic>{
+        'url': testUrl,
+        'headers': {},
+        'type': 'SHA1',
+        'fingerprints': ['AABBCCDDEEFF'],
+        'timeout': null,
+      });
+    });
+
+    test('check method returns expected string on success', () async {
+      const String testUrl = 'https://example.com';
+      const List<String> testFingerprints = ['AA:BB:CC:DD:EE:FF'];
+
+      final String result = await HttpCertificatePinning.check(
+        serverURL: testUrl,
+        sha: SHA.SHA256,
+        allowedSHAFingerprints: testFingerprints,
+      );
+
+      expect(result, 'SUCCESS');
+    });
+
+    test('check method handles empty fingerprints list', () async {
+      const String testUrl = 'https://example.com';
+      const SHA testSha = SHA.SHA256;
+      const List<String> testFingerprints = [];
+
+      await HttpCertificatePinning.check(
+        serverURL: testUrl,
+        sha: testSha,
+        allowedSHAFingerprints: testFingerprints,
+      );
+
+      expect(log, hasLength(1));
+      expect(log.first.arguments['fingerprints'], []);
+    });
+  });
+}
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