diff --git a/packages/better_networking/test/models/auth/api_auth_model_test.dart b/packages/better_networking/test/models/auth/api_auth_model_test.dart
new file mode 100644
index 00000000..6946ed37
--- /dev/null
+++ b/packages/better_networking/test/models/auth/api_auth_model_test.dart
@@ -0,0 +1,225 @@
+import 'package:better_networking/models/auth/api_auth_model.dart';
+import 'package:better_networking/models/auth/auth_basic_model.dart';
+import 'package:better_networking/models/auth/auth_bearer_model.dart';
+import 'package:better_networking/consts.dart';
+import 'package:test/test.dart';
+import 'auth_models.dart';
+
+void main() {
+  group('Testing AuthModel (API Auth Model)', () {
+    test("Testing AuthModel copyWith", () {
+      var authModel = authModel1;
+      final authModelCopyWith = authModel.copyWith(
+        type: APIAuthType.bearer,
+        bearer: const AuthBearerModel(token: 'new-bearer-token'),
+        basic: null,
+      );
+      expect(authModelCopyWith.type, APIAuthType.bearer);
+      expect(authModelCopyWith.bearer?.token, 'new-bearer-token');
+      expect(authModelCopyWith.basic, null);
+      // original model unchanged
+      expect(authModel.type, APIAuthType.basic);
+      expect(authModel.basic?.username, 'john_doe');
+    });
+
+    test("Testing AuthModel toJson", () {
+      var authModel = authModel1;
+      expect(authModel.toJson(), authModelJson1);
+    });
+
+    test("Testing AuthModel fromJson for basic authentication", () {
+      var authModel = authModel1;
+      final modelFromJson = AuthModel.fromJson(authModelJson1);
+      expect(modelFromJson, authModel);
+      expect(modelFromJson.type, APIAuthType.basic);
+      expect(modelFromJson.basic?.username, 'john_doe');
+      expect(modelFromJson.basic?.password, 'secure_password');
+    });
+
+    test("Testing AuthModel fromJson for bearer authentication", () {
+      var authModel = authModel2;
+      final modelFromJson = AuthModel.fromJson(authModelJson2);
+      expect(modelFromJson, authModel);
+      expect(modelFromJson.type, APIAuthType.bearer);
+      expect(
+        modelFromJson.bearer?.token,
+        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+      );
+    });
+
+    test("Testing AuthModel fromJson for api key authentication", () {
+      var authModel = authModel3;
+      final apiKeyModelJson = {
+        "type": "apiKey",
+        "apikey": authApiKeyModelJson1,
+        "bearer": null,
+        "basic": null,
+        "jwt": null,
+        "digest": null,
+      };
+      final modelFromJson = AuthModel.fromJson(apiKeyModelJson);
+      expect(modelFromJson, authModel);
+      expect(modelFromJson.type, APIAuthType.apiKey);
+      expect(modelFromJson.apikey?.key, 'ak-test-key-12345');
+      expect(modelFromJson.apikey?.location, 'header');
+      expect(modelFromJson.apikey?.name, 'x-api-key');
+    });
+
+    test("Testing AuthModel fromJson for jwt authentication", () {
+      var authModel = authModel4;
+      final jwtModelJson = {
+        "type": "jwt",
+        "apikey": null,
+        "bearer": null,
+        "basic": null,
+        "jwt": authJwtModelJson1,
+        "digest": null,
+      };
+      final modelFromJson = AuthModel.fromJson(jwtModelJson);
+      expect(modelFromJson, authModel);
+      expect(modelFromJson.type, APIAuthType.jwt);
+      expect(modelFromJson.jwt?.secret, 'jwt-secret-key');
+      expect(modelFromJson.jwt?.algorithm, 'RS256');
+      expect(modelFromJson.jwt?.isSecretBase64Encoded, true);
+      expect(modelFromJson.jwt?.headerPrefix, 'JWT');
+    });
+
+    test("Testing AuthModel fromJson for digest authentication", () {
+      var authModel = authModel5;
+      final digestModelJson = {
+        "type": "digest",
+        "apikey": null,
+        "bearer": null,
+        "basic": null,
+        "jwt": null,
+        "digest": authDigestModelJson1,
+      };
+      final modelFromJson = AuthModel.fromJson(digestModelJson);
+      expect(modelFromJson, authModel);
+      expect(modelFromJson.type, APIAuthType.digest);
+      expect(modelFromJson.digest?.algorithm, 'SHA-256');
+      expect(modelFromJson.digest?.username, 'digest_user');
+      expect(modelFromJson.digest?.password, 'digest_pass');
+      expect(modelFromJson.digest?.realm, 'protected-area');
+      expect(modelFromJson.digest?.qop, 'auth-int');
+    });
+
+    test("Testing AuthModel getters for different auth types", () {
+      expect(authModelNone.type, APIAuthType.none);
+      expect(authModel1.type, APIAuthType.basic);
+      expect(authModel2.type, APIAuthType.bearer);
+      expect(authModel3.type, APIAuthType.apiKey);
+      expect(authModel4.type, APIAuthType.jwt);
+      expect(authModel5.type, APIAuthType.digest);
+    });
+
+    test("Testing AuthModel with basic authentication", () {
+      var authModel = authModel1;
+      expect(authModel.type, APIAuthType.basic);
+      expect(authModel.basic, isNotNull);
+      expect(authModel.basic?.username, 'john_doe');
+      expect(authModel.basic?.password, 'secure_password');
+      expect(authModel.bearer, null);
+      expect(authModel.apikey, null);
+      expect(authModel.jwt, null);
+      expect(authModel.digest, null);
+    });
+
+    test("Testing AuthModel with bearer authentication", () {
+      var authModel = authModel2;
+      expect(authModel.type, APIAuthType.bearer);
+      expect(authModel.bearer, isNotNull);
+      expect(
+        authModel.bearer?.token,
+        startsWith('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9'),
+      );
+      expect(authModel.basic, null);
+      expect(authModel.apikey, null);
+      expect(authModel.jwt, null);
+      expect(authModel.digest, null);
+    });
+
+    test("Testing AuthModel with API key authentication", () {
+      var authModel = authModel3;
+      expect(authModel.type, APIAuthType.apiKey);
+      expect(authModel.apikey, isNotNull);
+      expect(authModel.apikey?.key, 'ak-test-key-12345');
+      expect(authModel.apikey?.location, 'header');
+      expect(authModel.apikey?.name, 'x-api-key');
+      expect(authModel.basic, null);
+      expect(authModel.bearer, null);
+      expect(authModel.jwt, null);
+      expect(authModel.digest, null);
+    });
+
+    test("Testing AuthModel with JWT authentication", () {
+      var authModel = authModel4;
+      expect(authModel.type, APIAuthType.jwt);
+      expect(authModel.jwt, isNotNull);
+      expect(authModel.jwt?.secret, 'jwt-secret-key');
+      expect(authModel.jwt?.algorithm, 'RS256');
+      expect(authModel.jwt?.isSecretBase64Encoded, true);
+      expect(authModel.basic, null);
+      expect(authModel.bearer, null);
+      expect(authModel.apikey, null);
+      expect(authModel.digest, null);
+    });
+
+    test("Testing AuthModel with digest authentication", () {
+      var authModel = authModel5;
+      expect(authModel.type, APIAuthType.digest);
+      expect(authModel.digest, isNotNull);
+      expect(authModel.digest?.username, 'digest_user');
+      expect(authModel.digest?.algorithm, 'SHA-256');
+      expect(authModel.digest?.qop, 'auth-int');
+      expect(authModel.basic, null);
+      expect(authModel.bearer, null);
+      expect(authModel.apikey, null);
+      expect(authModel.jwt, null);
+    });
+
+    test("Testing AuthModel with none authentication", () {
+      var authModel = authModelNone;
+      expect(authModel.type, APIAuthType.none);
+      expect(authModel.basic, null);
+      expect(authModel.bearer, null);
+      expect(authModel.apikey, null);
+      expect(authModel.jwt, null);
+      expect(authModel.digest, null);
+    });
+
+    test("Testing AuthModel equality", () {
+      const authModel1Copy = AuthModel(
+        type: APIAuthType.basic,
+        basic: AuthBasicAuthModel(
+          username: 'john_doe',
+          password: 'secure_password',
+        ),
+      );
+      expect(authModel1, authModel1Copy);
+      expect(authModel1, isNot(authModel2));
+      expect(authModelNone, const AuthModel(type: APIAuthType.none));
+    });
+
+    test("Testing AuthModel JSON serialization for different types", () {
+      var bearerModel = authModel2;
+      var bearerJson = bearerModel.toJson();
+      expect(bearerJson['type'], 'bearer');
+      expect(bearerJson['bearer'], isNotNull);
+      expect(bearerJson['basic'], null);
+
+      final modelFromJson = AuthModel.fromJson(authModelJson2);
+      expect(modelFromJson, bearerModel);
+    });
+
+    test("Testing AuthModel JSON serialization for none type", () {
+      var noneModel = authModelNone;
+      var noneJson = noneModel.toJson();
+      expect(noneJson, authModelNoneJson);
+
+      final modelFromJson = AuthModel.fromJson(authModelNoneJson);
+      expect(modelFromJson, noneModel);
+      expect(modelFromJson.type, APIAuthType.none);
+    });
+  });
+}
diff --git a/packages/better_networking/test/models/auth/auth_api_key_model_test.dart b/packages/better_networking/test/models/auth/auth_api_key_model_test.dart
new file mode 100644
index 00000000..8a121b0c
--- /dev/null
+++ b/packages/better_networking/test/models/auth/auth_api_key_model_test.dart
@@ -0,0 +1,67 @@
+import 'package:better_networking/models/auth/auth_api_key_model.dart';
+import 'package:test/test.dart';
+import 'auth_models.dart';
+
+void main() {
+  group('Testing AuthApiKeyModel', () {
+    test("Testing AuthApiKeyModel copyWith", () {
+      var authApiKeyModel = authApiKeyModel1;
+      final authApiKeyModelCopyWith = authApiKeyModel.copyWith(
+        key: 'new_api_key',
+        location: 'query',
+      );
+      expect(authApiKeyModelCopyWith.key, 'new_api_key');
+      expect(authApiKeyModelCopyWith.location, 'query');
+      // original model unchanged
+      expect(authApiKeyModel.key, 'ak-test-key-12345');
+      expect(authApiKeyModel.location, 'header');
+      expect(authApiKeyModel.name, 'x-api-key');
+    });
+
+    test("Testing AuthApiKeyModel toJson", () {
+      var authApiKeyModel = authApiKeyModel1;
+      expect(authApiKeyModel.toJson(), authApiKeyModelJson1);
+    });
+
+    test("Testing AuthApiKeyModel fromJson", () {
+      var authApiKeyModel = authApiKeyModel1;
+      final modelFromJson = AuthApiKeyModel.fromJson(authApiKeyModelJson1);
+      expect(modelFromJson, authApiKeyModel);
+      expect(modelFromJson.key, 'ak-test-key-12345');
+      expect(modelFromJson.location, 'header');
+      expect(modelFromJson.name, 'x-api-key');
+    });
+
+    test("Testing AuthApiKeyModel getters", () {
+      var authApiKeyModel = authApiKeyModel1;
+      expect(authApiKeyModel.key, 'ak-test-key-12345');
+      expect(authApiKeyModel.location, 'header');
+      expect(authApiKeyModel.name, 'x-api-key');
+    });
+
+    test("Testing AuthApiKeyModel default values", () {
+      const authApiKeyModelMinimal = AuthApiKeyModel(key: 'test-key');
+      expect(authApiKeyModelMinimal.key, 'test-key');
+      expect(authApiKeyModelMinimal.location, 'header'); // default value
+      expect(authApiKeyModelMinimal.name, 'x-api-key'); // default value
+    });
+
+    test("Testing AuthApiKeyModel equality", () {
+      const authApiKeyModel1Copy = AuthApiKeyModel(
+        key: 'ak-test-key-12345',
+        location: 'header',
+        name: 'x-api-key',
+      );
+      expect(authApiKeyModel1, authApiKeyModel1Copy);
+      expect(authApiKeyModel1, isNot(authApiKeyModel2));
+    });
+
+    test("Testing AuthApiKeyModel with different configurations", () {
+      expect(authApiKeyModel2.key, 'query-api-key-67890');
+      expect(authApiKeyModel2.location, 'query');
+      expect(authApiKeyModel2.name, 'api_key');
+      expect(authApiKeyModel1.location, isNot(authApiKeyModel2.location));
+      expect(authApiKeyModel1.name, isNot(authApiKeyModel2.name));
+    });
+  });
+}
diff --git a/packages/better_networking/test/models/auth/auth_basic_model_test.dart b/packages/better_networking/test/models/auth/auth_basic_model_test.dart
new file mode 100644
index 00000000..221c9b15
--- /dev/null
+++ b/packages/better_networking/test/models/auth/auth_basic_model_test.dart
@@ -0,0 +1,53 @@
+import 'package:better_networking/models/auth/auth_basic_model.dart';
+import 'package:test/test.dart';
+import 'auth_models.dart';
+
+void main() {
+  group('Testing AuthBasicAuthModel', () {
+    test("Testing AuthBasicAuthModel copyWith", () {
+      var authBasicModel = authBasicModel1;
+      final authBasicModelCopyWith = authBasicModel.copyWith(
+        password: 'new_password',
+      );
+      expect(authBasicModelCopyWith.password, 'new_password');
+      // original model unchanged
+      expect(authBasicModel.username, 'john_doe');
+      expect(authBasicModel.password, 'secure_password');
+    });
+
+    test("Testing AuthBasicAuthModel toJson", () {
+      var authBasicModel = authBasicModel1;
+      expect(authBasicModel.toJson(), authBasicModelJson1);
+    });
+
+    test("Testing AuthBasicAuthModel fromJson", () {
+      var authBasicModel = authBasicModel1;
+      final modelFromJson = AuthBasicAuthModel.fromJson(authBasicModelJson1);
+      expect(modelFromJson, authBasicModel);
+      expect(modelFromJson.username, 'john_doe');
+      expect(modelFromJson.password, 'secure_password');
+    });
+
+    test("Testing AuthBasicAuthModel getters", () {
+      var authBasicModel = authBasicModel1;
+      expect(authBasicModel.username, 'john_doe');
+      expect(authBasicModel.password, 'secure_password');
+    });
+
+    test("Testing AuthBasicAuthModel equality", () {
+      const authBasicModel1Copy = AuthBasicAuthModel(
+        username: 'john_doe',
+        password: 'secure_password',
+      );
+      expect(authBasicModel1, authBasicModel1Copy);
+      expect(authBasicModel1, isNot(authBasicModel2));
+    });
+
+    test("Testing AuthBasicAuthModel with different values", () {
+      expect(authBasicModel2.username, 'jane_smith');
+      expect(authBasicModel2.password, 'another_password');
+      expect(authBasicModel1.username, isNot(authBasicModel2.username));
+      expect(authBasicModel1.password, isNot(authBasicModel2.password));
+    });
+  });
+}
diff --git a/packages/better_networking/test/models/auth/auth_bearer_model_test.dart b/packages/better_networking/test/models/auth/auth_bearer_model_test.dart
new file mode 100644
index 00000000..389934ed
--- /dev/null
+++ b/packages/better_networking/test/models/auth/auth_bearer_model_test.dart
@@ -0,0 +1,57 @@
+import 'package:better_networking/models/auth/auth_bearer_model.dart';
+import 'package:test/test.dart';
+import 'auth_models.dart';
+
+void main() {
+  group('Testing AuthBearerModel', () {
+    test("Testing AuthBearerModel copyWith", () {
+      var authBearerModel = authBearerModel1;
+      final authBearerModelCopyWith = authBearerModel.copyWith(
+        token: 'new_bearer_token',
+      );
+      expect(authBearerModelCopyWith.token, 'new_bearer_token');
+      // original model unchanged
+      expect(
+        authBearerModel.token,
+        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+      );
+    });
+
+    test("Testing AuthBearerModel toJson", () {
+      var authBearerModel = authBearerModel1;
+      expect(authBearerModel.toJson(), authBearerModelJson1);
+    });
+
+    test("Testing AuthBearerModel fromJson", () {
+      var authBearerModel = authBearerModel1;
+      final modelFromJson = AuthBearerModel.fromJson(authBearerModelJson1);
+      expect(modelFromJson, authBearerModel);
+      expect(
+        modelFromJson.token,
+        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+      );
+    });
+
+    test("Testing AuthBearerModel getters", () {
+      var authBearerModel = authBearerModel1;
+      expect(
+        authBearerModel.token,
+        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+      );
+    });
+
+    test("Testing AuthBearerModel equality", () {
+      const authBearerModel1Copy = AuthBearerModel(
+        token:
+            'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+      );
+      expect(authBearerModel1, authBearerModel1Copy);
+      expect(authBearerModel1, isNot(authBearerModel2));
+    });
+
+    test("Testing AuthBearerModel with different tokens", () {
+      expect(authBearerModel2.token, 'different_bearer_token_value');
+      expect(authBearerModel1.token, isNot(authBearerModel2.token));
+    });
+  });
+}
diff --git a/packages/better_networking/test/models/auth/auth_digest_model_test.dart b/packages/better_networking/test/models/auth/auth_digest_model_test.dart
new file mode 100644
index 00000000..15a31399
--- /dev/null
+++ b/packages/better_networking/test/models/auth/auth_digest_model_test.dart
@@ -0,0 +1,87 @@
+import 'package:better_networking/models/auth/auth_digest_model.dart';
+import 'package:test/test.dart';
+import 'auth_models.dart';
+
+void main() {
+  group('Testing AuthDigestModel', () {
+    test("Testing AuthDigestModel copyWith", () {
+      var authDigestModel = authDigestModel1;
+      final authDigestModelCopyWith = authDigestModel.copyWith(
+        username: 'new_user',
+        algorithm: 'MD5',
+        qop: 'auth',
+      );
+      expect(authDigestModelCopyWith.username, 'new_user');
+      expect(authDigestModelCopyWith.algorithm, 'MD5');
+      expect(authDigestModelCopyWith.qop, 'auth');
+      // original model unchanged
+      expect(authDigestModel.username, 'digest_user');
+      expect(authDigestModel.algorithm, 'SHA-256');
+      expect(authDigestModel.qop, 'auth-int');
+    });
+
+    test("Testing AuthDigestModel toJson", () {
+      var authDigestModel = authDigestModel1;
+      expect(authDigestModel.toJson(), authDigestModelJson1);
+    });
+
+    test("Testing AuthDigestModel fromJson", () {
+      var authDigestModel = authDigestModel1;
+      final modelFromJson = AuthDigestModel.fromJson(authDigestModelJson1);
+      expect(modelFromJson, authDigestModel);
+      expect(modelFromJson.username, 'digest_user');
+      expect(modelFromJson.password, 'digest_pass');
+      expect(modelFromJson.realm, 'protected-area');
+      expect(modelFromJson.algorithm, 'SHA-256');
+    });
+
+    test("Testing AuthDigestModel getters", () {
+      var authDigestModel = authDigestModel1;
+      expect(authDigestModel.username, 'digest_user');
+      expect(authDigestModel.password, 'digest_pass');
+      expect(authDigestModel.realm, 'protected-area');
+      expect(authDigestModel.nonce, 'dcd98b7102dd2f0e8b11d0f600bfb0c093');
+      expect(authDigestModel.algorithm, 'SHA-256');
+      expect(authDigestModel.qop, 'auth-int');
+      expect(authDigestModel.opaque, '5ccc069c403ebaf9f0171e9517f40e41');
+    });
+
+    test("Testing AuthDigestModel equality", () {
+      const authDigestModel1Copy = AuthDigestModel(
+        username: 'digest_user',
+        password: 'digest_pass',
+        realm: 'protected-area',
+        nonce: 'dcd98b7102dd2f0e8b11d0f600bfb0c093',
+        algorithm: 'SHA-256',
+        qop: 'auth-int',
+        opaque: '5ccc069c403ebaf9f0171e9517f40e41',
+      );
+      expect(authDigestModel1, authDigestModel1Copy);
+      expect(authDigestModel1, isNot(authDigestModel2));
+    });
+
+    test("Testing AuthDigestModel with different configurations", () {
+      expect(authDigestModel2.username, 'another_digest_user');
+      expect(authDigestModel2.password, 'another_digest_pass');
+      expect(authDigestModel2.realm, 'different-realm');
+      expect(authDigestModel2.nonce, 'abc12345678901234567890abcdef012');
+      expect(authDigestModel2.algorithm, 'MD5');
+      expect(authDigestModel2.qop, 'auth');
+      expect(authDigestModel2.opaque, 'fedcba0987654321098765432109876543');
+
+      // Compare differences
+      expect(authDigestModel1.username, isNot(authDigestModel2.username));
+      expect(authDigestModel1.algorithm, isNot(authDigestModel2.algorithm));
+      expect(authDigestModel1.qop, isNot(authDigestModel2.qop));
+      expect(authDigestModel1.realm, isNot(authDigestModel2.realm));
+    });
+
+    test("Testing AuthDigestModel nonce and opaque values", () {
+      var authDigestModel = authDigestModel1;
+      expect(authDigestModel.nonce.length, 34);
+      expect(authDigestModel.opaque.length, 32);
+      expect(authDigestModel.nonce, matches(RegExp(r'^[a-f0-9]+$')));
+      expect(authDigestModel.opaque, matches(RegExp(r'^[a-f0-9]+$')));
+    });
+  });
+}
diff --git a/packages/better_networking/test/models/auth/auth_jwt_model_test.dart b/packages/better_networking/test/models/auth/auth_jwt_model_test.dart
new file mode 100644
index 00000000..f6c47527
--- /dev/null
+++ b/packages/better_networking/test/models/auth/auth_jwt_model_test.dart
@@ -0,0 +1,112 @@
+import 'package:better_networking/models/auth/auth_jwt_model.dart';
+import 'package:test/test.dart';
+import 'auth_models.dart';
+
+void main() {
+  group('Testing AuthJwtModel', () {
+    test("Testing AuthJwtModel copyWith", () {
+      var authJwtModel = authJwtModel1;
+      final authJwtModelCopyWith = authJwtModel.copyWith(
+        secret: 'new_secret',
+        algorithm: 'HS256',
+        isSecretBase64Encoded: false,
+      );
+      expect(authJwtModelCopyWith.secret, 'new_secret');
+      expect(authJwtModelCopyWith.algorithm, 'HS256');
+      expect(authJwtModelCopyWith.isSecretBase64Encoded, false);
+      // original model unchanged
+      expect(authJwtModel.secret, 'jwt-secret-key');
+      expect(authJwtModel.algorithm, 'RS256');
+      expect(authJwtModel.isSecretBase64Encoded, true);
+    });
+
+    test("Testing AuthJwtModel toJson", () {
+      var authJwtModel = authJwtModel1;
+      expect(authJwtModel.toJson(), authJwtModelJson1);
+    });
+
+    test("Testing AuthJwtModel fromJson", () {
+      var authJwtModel = authJwtModel1;
+      final modelFromJson = AuthJwtModel.fromJson(authJwtModelJson1);
+      expect(modelFromJson, authJwtModel);
+      expect(modelFromJson.secret, 'jwt-secret-key');
+      expect(modelFromJson.algorithm, 'RS256');
+      expect(modelFromJson.isSecretBase64Encoded, true);
+    });
+
+    test("Testing AuthJwtModel getters", () {
+      var authJwtModel = authJwtModel1;
+      expect(authJwtModel.secret, 'jwt-secret-key');
+      expect(
+        authJwtModel.privateKey,
+        startsWith('-----BEGIN RSA PRIVATE KEY-----'),
+      );
+      expect(authJwtModel.payload, '{"user_id": 123, "exp": 1735689600}');
+      expect(authJwtModel.addTokenTo, 'header');
+      expect(authJwtModel.algorithm, 'RS256');
+      expect(authJwtModel.isSecretBase64Encoded, true);
+      expect(authJwtModel.headerPrefix, 'JWT');
+      expect(authJwtModel.queryParamKey, 'jwt_token');
+      expect(authJwtModel.header, 'X-JWT-Token');
+    });
+
+    test("Testing AuthJwtModel equality", () {
+      const authJwtModel1Copy = AuthJwtModel(
+        secret: 'jwt-secret-key',
+        privateKey: '''-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----''',
+        payload: '{"user_id": 123, "exp": 1735689600}',
+        addTokenTo: 'header',
+        algorithm: 'RS256',
+        isSecretBase64Encoded: true,
+        headerPrefix: 'JWT',
+        queryParamKey: 'jwt_token',
+        header: 'X-JWT-Token',
+      );
+      expect(authJwtModel1, authJwtModel1Copy);
+      expect(authJwtModel1, isNot(authJwtModel2));
+    });
+
+    test("Testing AuthJwtModel with different configurations", () {
+      expect(authJwtModel2.secret, 'different-jwt-secret');
+      expect(authJwtModel2.algorithm, 'HS256');
+      expect(authJwtModel2.isSecretBase64Encoded, false);
+      expect(authJwtModel2.addTokenTo, 'query');
+      expect(authJwtModel2.headerPrefix, 'Bearer');
+      expect(authJwtModel2.header, 'Authorization');
+
+      // Compare differences
+      expect(authJwtModel1.secret, isNot(authJwtModel2.secret));
+      expect(authJwtModel1.algorithm, isNot(authJwtModel2.algorithm));
+      expect(
+        authJwtModel1.isSecretBase64Encoded,
+        isNot(authJwtModel2.isSecretBase64Encoded),
+      );
+      expect(authJwtModel1.addTokenTo, isNot(authJwtModel2.addTokenTo));
+    });
+
+    test("Testing AuthJwtModel payload parsing", () {
+      var authJwtModel = authJwtModel1;
+      expect(authJwtModel.payload, contains('user_id'));
+      expect(authJwtModel.payload, contains('exp'));
+
+      var authJwtModel2Local = authJwtModel2;
+      expect(authJwtModel2Local.payload, contains('sub'));
+      expect(authJwtModel2Local.payload, contains('name'));
+      expect(authJwtModel2Local.payload, contains('John Doe'));
+    });
+  });
+}
diff --git a/packages/better_networking/test/models/auth/auth_models.dart b/packages/better_networking/test/models/auth/auth_models.dart
new file mode 100644
index 00000000..50990796
--- /dev/null
+++ b/packages/better_networking/test/models/auth/auth_models.dart
@@ -0,0 +1,212 @@
+import 'package:better_networking/models/auth/api_auth_model.dart';
+import 'package:better_networking/models/auth/auth_basic_model.dart';
+import 'package:better_networking/models/auth/auth_bearer_model.dart';
+import 'package:better_networking/models/auth/auth_api_key_model.dart';
+import 'package:better_networking/models/auth/auth_jwt_model.dart';
+import 'package:better_networking/models/auth/auth_digest_model.dart';
+import 'package:better_networking/consts.dart';
+
+/// Auth models for testing
+
+const authBasicModel1 = AuthBasicAuthModel(
+  username: 'john_doe',
+  password: 'secure_password',
+);
+
+const authBasicModel2 = AuthBasicAuthModel(
+  username: 'jane_smith',
+  password: 'another_password',
+);
+
+const authBearerModel1 = AuthBearerModel(
+  token:
+      'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+);
+
+const authBearerModel2 = AuthBearerModel(token: 'different_bearer_token_value');
+
+const authApiKeyModel1 = AuthApiKeyModel(
+  key: 'ak-test-key-12345',
+  location: 'header',
+  name: 'x-api-key',
+);
+
+const authApiKeyModel2 = AuthApiKeyModel(
+  key: 'query-api-key-67890',
+  location: 'query',
+  name: 'api_key',
+);
+
+const authJwtModel1 = AuthJwtModel(
+  secret: 'jwt-secret-key',
+  privateKey: '''-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----''',
+  payload: '{"user_id": 123, "exp": 1735689600}',
+  addTokenTo: 'header',
+  algorithm: 'RS256',
+  isSecretBase64Encoded: true,
+  headerPrefix: 'JWT',
+  queryParamKey: 'jwt_token',
+  header: 'X-JWT-Token',
+);
+
+const authJwtModel2 = AuthJwtModel(
+  secret: 'different-jwt-secret',
+  payload: '{"sub": "1234567890", "name": "John Doe", "iat": 1516239022}',
+  addTokenTo: 'query',
+  algorithm: 'HS256',
+  isSecretBase64Encoded: false,
+  headerPrefix: 'Bearer',
+  queryParamKey: 'token',
+  header: 'Authorization',
+);
+
+const authDigestModel1 = AuthDigestModel(
+  username: 'digest_user',
+  password: 'digest_pass',
+  realm: 'protected-area',
+  nonce: 'dcd98b7102dd2f0e8b11d0f600bfb0c093',
+  algorithm: 'SHA-256',
+  qop: 'auth-int',
+  opaque: '5ccc069c403ebaf9f0171e9517f40e41',
+);
+
+const authDigestModel2 = AuthDigestModel(
+  username: 'another_digest_user',
+  password: 'another_digest_pass',
+  realm: 'different-realm',
+  nonce: 'abc12345678901234567890abcdef012',
+  algorithm: 'MD5',
+  qop: 'auth',
+  opaque: 'fedcba0987654321098765432109876543',
+);
+
+const authModel1 = AuthModel(type: APIAuthType.basic, basic: authBasicModel1);
+
+const authModel2 = AuthModel(
+  type: APIAuthType.bearer,
+  bearer: authBearerModel1,
+);
+
+const authModel3 = AuthModel(
+  type: APIAuthType.apiKey,
+  apikey: authApiKeyModel1,
+);
+
+const authModel4 = AuthModel(type: APIAuthType.jwt, jwt: authJwtModel1);
+
+const authModel5 = AuthModel(
+  type: APIAuthType.digest,
+  digest: authDigestModel1,
+);
+
+const authModelNone = AuthModel(type: APIAuthType.none);
+
+/// JSON representations for testing
+
+final Map<String, dynamic> authBasicModelJson1 = {
+  "username": "john_doe",
+  "password": "secure_password",
+};
+
+final Map<String, dynamic> authBearerModelJson1 = {
+  "token":
+      "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c",
+};
+
+final Map<String, dynamic> authApiKeyModelJson1 = {
+  "key": "ak-test-key-12345",
+  "location": "header",
+  "name": "x-api-key",
+};
+
+final Map<String, dynamic> authJwtModelJson1 = {
+  "secret": "jwt-secret-key",
+  "privateKey": '''-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----''',
+  "payload": "{\"user_id\": 123, \"exp\": 1735689600}",
+  "addTokenTo": "header",
+  "algorithm": "RS256",
+  "isSecretBase64Encoded": true,
+  "headerPrefix": "JWT",
+  "queryParamKey": "jwt_token",
+  "header": "X-JWT-Token",
+};
+
+final Map<String, dynamic> authDigestModelJson1 = {
+  "username": "digest_user",
+  "password": "digest_pass",
+  "realm": "protected-area",
+  "nonce": "dcd98b7102dd2f0e8b11d0f600bfb0c093",
+  "algorithm": "SHA-256",
+  "qop": "auth-int",
+  "opaque": "5ccc069c403ebaf9f0171e9517f40e41",
+};
+
+final Map<String, dynamic> authModelJson1 = {
+  "type": "basic",
+  "apikey": null,
+  "bearer": null,
+  "basic": {"username": "john_doe", "password": "secure_password"},
+  "jwt": null,
+  "digest": null,
+};
+
+final Map<String, dynamic> authModelJson2 = {
+  "type": "bearer",
+  "apikey": null,
+  "bearer": {
+    "token":
+        "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c",
+  },
+  "basic": null,
+  "jwt": null,
+  "digest": null,
+};
+
+final Map<String, dynamic> authModelJson3 = {
+  "type": "",
+  "apikey": null,
+  "bearer": {
+    "token":
+        "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c",
+  },
+  "basic": null,
+  "jwt": null,
+  "digest": null,
+};
+
+final Map<String, dynamic> authModelNoneJson = {
+  "type": "none",
+  "apikey": null,
+  "bearer": null,
+  "basic": null,
+  "jwt": null,
+  "digest": null,
+};
diff --git a/packages/better_networking/test/utils/auth/auth_handling_test.dart b/packages/better_networking/test/utils/auth/auth_handling_test.dart
index b461ea16..905dcf89 100644
--- a/packages/better_networking/test/utils/auth/auth_handling_test.dart
+++ b/packages/better_networking/test/utils/auth/auth_handling_test.dart
@@ -51,7 +51,7 @@ void main() {
 
         final result = await handleAuth(httpRequestModel, authModel);
 
-        expect(result.headers, isEmpty);
+        expect(result.headers, isNull);
         expect(result.url, equals('https://api.apidash.dev/users'));
       },
     );