test: bundle serialization tests into abstract test case

src/test/java/de/stklcode/jvault/connector/model/AbstractModelTest.java

@@ -0,0 +1,70 @@
+package de.stklcode.jvault.connector.model;
+
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.junit.jupiter.api.Test;
+
+import java.io.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * Abstract testcase for model classes.
+ *
+ * @author Stefan Kalscheuer
+ * @since 1.1
+ */
+public abstract class AbstractModelTest<T> {
+    protected final Class<?> modelClass;
+
+    /**
+     * Test case constructor.
+     *
+     * @param modelClass Target class to test.
+     */
+    protected AbstractModelTest(Class<T> modelClass) {
+        this.modelClass = modelClass;
+    }
+
+    /**
+     * Create a "full" model instance.
+     *
+     * @return Model instance.
+     */
+    protected abstract T createFull();
+
+    /**
+     * Test if {@link Object#equals(Object)} and {@link Object#hashCode()} are implemented, s.t. all fields are covered.
+     */
+    @Test
+    void testEqualsHashcode() {
+        EqualsVerifier.simple().forClass(modelClass).verify();
+    }
+
+    /**
+     * Test Java serialization of a full model instance.
+     * Serialization and deserialization must not fail and the resulting object should equal the original object.
+     */
+    @Test
+    void serializationTest() {
+        T original = createFull();
+        byte[] bytes;
+        try (var bos = new ByteArrayOutputStream();
+             var oos = new ObjectOutputStream(bos)) {
+            oos.writeObject(original);
+            bytes = bos.toByteArray();
+        } catch (IOException e) {
+            fail("Serialization failed", e);
+            return;
+        }
+
+        try (var bis = new ByteArrayInputStream(bytes);
+             var ois = new ObjectInputStream(bis)) {
+            Object copy = ois.readObject();
+            assertEquals(modelClass, copy.getClass(), "Invalid class after deserialization");
+            assertEquals(original, copy, "Deserialized object should be equal to the original");
+        } catch (IOException | ClassNotFoundException e) {
+            fail("Deserialization failed", e);
+        }
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/AppRoleSecretTest.java

@@ -17,7 +17,6 @@
 package de.stklcode.jvault.connector.model;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.Test;
 
 import java.lang.reflect.Field;
@@ -34,7 +33,7 @@ import static org.junit.jupiter.api.Assumptions.assumeTrue;
  * @author Stefan Kalscheuer
  * @since 0.5.0
  */
-class AppRoleSecretTest {
+class AppRoleSecretTest extends AbstractModelTest<AppRoleSecret> {
     private static final String TEST_ID = "abc123";
     private static final Map<String, Object> TEST_META = Map.of(
             "foo", "bar",
@@ -42,6 +41,15 @@ class AppRoleSecretTest {
     );
     private static final List<String> TEST_CIDR = List.of("203.0.113.0/24", "198.51.100.0/24");
 
+    AppRoleSecretTest() {
+        super(AppRoleSecret.class);
+    }
+
+    @Override
+    protected AppRoleSecret createFull() {
+        return new AppRoleSecret(TEST_ID, TEST_META, TEST_CIDR);
+    }
+
     /**
      * Test constructors.
      */
@@ -166,11 +174,6 @@ class AppRoleSecretTest {
         assertEquals(12345, secret2.getTtl());
     }
 
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(AppRoleSecret.class).verify();
-    }
-
     private static void setPrivateField(Object object, String fieldName, Object value) throws NoSuchFieldException, IllegalAccessException {
         Field field = object.getClass().getDeclaredField(fieldName);
         boolean accessible = field.isAccessible();

src/test/java/de/stklcode/jvault/connector/model/AppRoleTest.java

@@ -18,7 +18,6 @@ package de.stklcode.jvault.connector.model;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
@@ -33,7 +32,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.4.0
  */
-class AppRoleTest {
+class AppRoleTest extends AbstractModelTest<AppRole> {
     private static final String NAME = "TestRole";
     private static final String ID = "test-id";
     private static final Boolean BIND_SECRET_ID = true;
@@ -57,6 +56,31 @@ class AppRoleTest {
     private static final String JSON_FULL = String.format("{\"role_name\":\"%s\",\"role_id\":\"%s\",\"bind_secret_id\":%s,\"secret_id_bound_cidrs\":\"%s\",\"secret_id_num_uses\":%d,\"secret_id_ttl\":%d,\"enable_local_secret_ids\":%s,\"token_ttl\":%d,\"token_max_ttl\":%d,\"token_policies\":\"%s\",\"token_bound_cidrs\":\"%s\",\"token_explicit_max_ttl\":%d,\"token_no_default_policy\":%s,\"token_num_uses\":%d,\"token_period\":%d,\"token_type\":\"%s\"}",
             NAME, ID, BIND_SECRET_ID, CIDR_1, SECRET_ID_NUM_USES, SECRET_ID_TTL, ENABLE_LOCAL_SECRET_IDS, TOKEN_TTL, TOKEN_MAX_TTL, POLICY, CIDR_1, TOKEN_EXPLICIT_MAX_TTL, TOKEN_NO_DEFAULT_POLICY, TOKEN_NUM_USES, TOKEN_PERIOD, TOKEN_TYPE.value());
 
+    AppRoleTest() {
+        super(AppRole.class);
+    }
+
+    @Override
+    protected AppRole createFull() {
+        return AppRole.builder(NAME)
+                .withId(ID)
+                .withBindSecretID(BIND_SECRET_ID)
+                .withSecretIdBoundCidrs(BOUND_CIDR_LIST)
+                .withTokenPolicies(POLICIES)
+                .withSecretIdNumUses(SECRET_ID_NUM_USES)
+                .withSecretIdTtl(SECRET_ID_TTL)
+                .withEnableLocalSecretIds(ENABLE_LOCAL_SECRET_IDS)
+                .withTokenTtl(TOKEN_TTL)
+                .withTokenMaxTtl(TOKEN_MAX_TTL)
+                .withTokenBoundCidrs(BOUND_CIDR_LIST)
+                .withTokenExplicitMaxTtl(TOKEN_EXPLICIT_MAX_TTL)
+                .withTokenNoDefaultPolicy(TOKEN_NO_DEFAULT_POLICY)
+                .withTokenNumUses(TOKEN_NUM_USES)
+                .withTokenPeriod(TOKEN_PERIOD)
+                .withTokenType(TOKEN_TYPE)
+                .build();
+    }
+
     @BeforeAll
     static void init() {
         BOUND_CIDR_LIST.add(CIDR_1);
@@ -94,23 +118,7 @@ class AppRoleTest {
      */
     @Test
     void buildFullTest() throws JsonProcessingException {
-        AppRole role = AppRole.builder(NAME)
+        AppRole role = createFull();
-                .withId(ID)
-                .withBindSecretID(BIND_SECRET_ID)
-                .withSecretIdBoundCidrs(BOUND_CIDR_LIST)
-                .withTokenPolicies(POLICIES)
-                .withSecretIdNumUses(SECRET_ID_NUM_USES)
-                .withSecretIdTtl(SECRET_ID_TTL)
-                .withEnableLocalSecretIds(ENABLE_LOCAL_SECRET_IDS)
-                .withTokenTtl(TOKEN_TTL)
-                .withTokenMaxTtl(TOKEN_MAX_TTL)
-                .withTokenBoundCidrs(BOUND_CIDR_LIST)
-                .withTokenExplicitMaxTtl(TOKEN_EXPLICIT_MAX_TTL)
-                .withTokenNoDefaultPolicy(TOKEN_NO_DEFAULT_POLICY)
-                .withTokenNumUses(TOKEN_NUM_USES)
-                .withTokenPeriod(TOKEN_PERIOD)
-                .withTokenType(TOKEN_TYPE)
-                .build();
         assertEquals(NAME, role.getName());
         assertEquals(ID, role.getId());
         assertEquals(BIND_SECRET_ID, role.getBindSecretId());
@@ -173,9 +181,4 @@ class AppRoleTest {
         assertEquals(2, role.getTokenPolicies().size());
         assertTrue(role.getTokenPolicies().containsAll(List.of(POLICY, POLICY_2)));
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(AppRole.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/TokenRoleTest.java

@@ -18,7 +18,6 @@ package de.stklcode.jvault.connector.model;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
@@ -32,7 +31,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.9
  */
-class TokenRoleTest {
+class TokenRoleTest extends AbstractModelTest<TokenRole> {
     private static final String NAME = "test-role";
     private static final String ALLOWED_POLICY_1 = "apol-1";
     private static final String ALLOWED_POLICY_2 = "apol-2";
@@ -74,6 +73,33 @@ class TokenRoleTest {
             "\"token_period\":" + TOKEN_PERIOD + "," +
             "\"token_type\":\"" + TOKEN_TYPE.value() + "\"}";
 
+    TokenRoleTest() {
+        super(TokenRole.class);
+    }
+
+    @Override
+    protected TokenRole createFull() {
+        return TokenRole.builder()
+                .forName(NAME)
+                .withAllowedPolicies(ALLOWED_POLICIES)
+                .withAllowedPolicy(ALLOWED_POLICY_3)
+                .withDisallowedPolicy(DISALLOWED_POLICY_1)
+                .withDisallowedPolicies(DISALLOWED_POLICIES)
+                .orphan(ORPHAN)
+                .renewable(RENEWABLE)
+                .withPathSuffix(PATH_SUFFIX)
+                .withAllowedEntityAliases(ALLOWED_ENTITY_ALIASES)
+                .withAllowedEntityAlias(ALLOWED_ENTITY_ALIAS_2)
+                .withTokenBoundCidr(TOKEN_BOUND_CIDR_3)
+                .withTokenBoundCidrs(TOKEN_BOUND_CIDRS)
+                .withTokenExplicitMaxTtl(TOKEN_EXPLICIT_MAX_TTL)
+                .withTokenNoDefaultPolicy(TOKEN_NO_DEFAULT_POLICY)
+                .withTokenNumUses(TOKEN_NUM_USES)
+                .withTokenPeriod(TOKEN_PERIOD)
+                .withTokenType(TOKEN_TYPE)
+                .build();
+    }
+
     /**
      * Build token without any parameters.
      */
@@ -145,25 +171,7 @@ class TokenRoleTest {
      */
     @Test
     void buildFullTest() throws JsonProcessingException {
-        TokenRole role = TokenRole.builder()
+        TokenRole role = createFull();
-                .forName(NAME)
-                .withAllowedPolicies(ALLOWED_POLICIES)
-                .withAllowedPolicy(ALLOWED_POLICY_3)
-                .withDisallowedPolicy(DISALLOWED_POLICY_1)
-                .withDisallowedPolicies(DISALLOWED_POLICIES)
-                .orphan(ORPHAN)
-                .renewable(RENEWABLE)
-                .withPathSuffix(PATH_SUFFIX)
-                .withAllowedEntityAliases(ALLOWED_ENTITY_ALIASES)
-                .withAllowedEntityAlias(ALLOWED_ENTITY_ALIAS_2)
-                .withTokenBoundCidr(TOKEN_BOUND_CIDR_3)
-                .withTokenBoundCidrs(TOKEN_BOUND_CIDRS)
-                .withTokenExplicitMaxTtl(TOKEN_EXPLICIT_MAX_TTL)
-                .withTokenNoDefaultPolicy(TOKEN_NO_DEFAULT_POLICY)
-                .withTokenNumUses(TOKEN_NUM_USES)
-                .withTokenPeriod(TOKEN_PERIOD)
-                .withTokenType(TOKEN_TYPE)
-                .build();
         assertEquals(NAME, role.getName());
         assertEquals(ALLOWED_POLICIES.size() + 1, role.getAllowedPolicies().size());
         assertTrue(role.getAllowedPolicies().containsAll(List.of(ALLOWED_POLICY_1, ALLOWED_POLICY_2, ALLOWED_POLICY_3)));
@@ -184,9 +192,4 @@ class TokenRoleTest {
         // Verify that all parameters are included in JSON string.
         assertEquals(JSON_FULL, new ObjectMapper().writeValueAsString(role));
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(TokenRole.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/TokenTest.java

@@ -18,7 +18,6 @@ package de.stklcode.jvault.connector.model;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
@@ -32,7 +31,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.4.0
  */
-class TokenTest {
+class TokenTest extends AbstractModelTest<Token> {
     private static final String ID = "test-id";
     private static final String DISPLAY_NAME = "display-name";
     private static final Boolean NO_PARENT = false;
@@ -54,6 +53,29 @@ class TokenTest {
     private static final String ENTITY_ALIAS = "alias-value";
     private static final String JSON_FULL = "{\"id\":\"test-id\",\"type\":\"service\",\"display_name\":\"display-name\",\"no_parent\":false,\"no_default_policy\":false,\"ttl\":123,\"explicit_max_ttl\":456,\"num_uses\":4,\"policies\":[\"policy\"],\"meta\":{\"key\":\"value\"},\"renewable\":true,\"period\":3600,\"entity_alias\":\"alias-value\"}";
 
+    TokenTest() {
+        super(Token.class);
+    }
+
+    @Override
+    protected Token createFull() {
+        return Token.builder()
+                .withId(ID)
+                .withType(Token.Type.SERVICE)
+                .withDisplayName(DISPLAY_NAME)
+                .withNoParent(NO_PARENT)
+                .withNoDefaultPolicy(NO_DEFAULT_POLICY)
+                .withTtl(TTL)
+                .withExplicitMaxTtl(EXPLICIT_MAX_TTL)
+                .withNumUses(NUM_USES)
+                .withPolicies(POLICIES)
+                .withMeta(META)
+                .withRenewable(RENEWABLE)
+                .withPeriod(PERIOD)
+                .withEntityAlias(ENTITY_ALIAS)
+                .build();
+    }
+
     @BeforeAll
     static void init() {
         POLICIES.add(POLICY);
@@ -92,21 +114,7 @@ class TokenTest {
      */
     @Test
     void buildFullTest() throws JsonProcessingException {
-        Token token = Token.builder()
+        Token token = createFull();
-                .withId(ID)
-                .withType(Token.Type.SERVICE)
-                .withDisplayName(DISPLAY_NAME)
-                .withNoParent(NO_PARENT)
-                .withNoDefaultPolicy(NO_DEFAULT_POLICY)
-                .withTtl(TTL)
-                .withExplicitMaxTtl(EXPLICIT_MAX_TTL)
-                .withNumUses(NUM_USES)
-                .withPolicies(POLICIES)
-                .withMeta(META)
-                .withRenewable(RENEWABLE)
-                .withPeriod(PERIOD)
-                .withEntityAlias(ENTITY_ALIAS)
-                .build();
         assertEquals(ID, token.getId());
         assertEquals(Token.Type.SERVICE.value(), token.getType());
         assertEquals(DISPLAY_NAME, token.getDisplayName());
@@ -171,9 +179,4 @@ class TokenTest {
         assertEquals(META_VALUE, token.getMeta().get(META_KEY));
         assertEquals(META_VALUE_2, token.getMeta().get(META_KEY_2));
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(Token.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/AppRoleResponseTest.java

@@ -16,9 +16,10 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import de.stklcode.jvault.connector.model.AppRole;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
@@ -31,7 +32,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.6.2
  */
-class AppRoleResponseTest {
+class AppRoleResponseTest extends AbstractModelTest<AppRoleResponse> {
     private static final Integer ROLE_TOKEN_TTL = 1200;
     private static final Integer ROLE_TOKEN_MAX_TTL = 1800;
     private static final Integer ROLE_SECRET_TTL = 600;
@@ -61,6 +62,20 @@ class AppRoleResponseTest {
             "  \"lease_id\": \"\"\n" +
             "}";
 
+    AppRoleResponseTest() {
+        super(AppRoleResponse.class);
+    }
+
+    @Override
+    protected AppRoleResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(RES_JSON, AppRoleResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test getter, setter and get-methods for response data.
      */
@@ -94,9 +109,4 @@ class AppRoleResponseTest {
         assertNull(role.getTokenBoundCidrs(), "Incorrect bound CIDR list");
         assertEquals("", role.getTokenBoundCidrsString(), "Incorrect bound CIDR list string");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(AppRoleResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/AuthMethodsResponseTest.java

@@ -16,14 +16,13 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import de.stklcode.jvault.connector.model.AuthBackend;
 import de.stklcode.jvault.connector.model.response.embedded.AuthMethod;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.Test;
 
-import java.io.Serializable;
 import java.util.Collections;
 import java.util.Map;
 import java.util.Set;
@@ -36,7 +35,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.6.2
  */
-class AuthMethodsResponseTest {
+class AuthMethodsResponseTest extends AbstractModelTest<AuthMethodsResponse> {
     private static final String GH_PATH = "github/";
     private static final String GH_TYPE = "github";
     private static final String GH_DESCR = "GitHub auth";
@@ -63,6 +62,20 @@ class AuthMethodsResponseTest {
             "  }\n" +
             "}";
 
+    AuthMethodsResponseTest() {
+        super(AuthMethodsResponse.class);
+    }
+
+    @Override
+    protected AuthMethodsResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(RES_JSON, AuthMethodsResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test getter, setter and get-methods for response data.
      */
@@ -106,13 +119,4 @@ class AuthMethodsResponseTest {
         assertEquals(TK_LEASE_TTL.toString(), method.getConfig().get("default_lease_ttl"), "Incorrect lease TTL config");
         assertEquals(TK_MAX_LEASE_TTL.toString(), method.getConfig().get("max_lease_ttl"), "Incorrect max lease TTL config");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(AuthMethodsResponse.class).verify();
-    }
-
-    private static class Dummy implements Serializable {
-        private static final long serialVersionUID = 9075949348402246139L;
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/AuthResponseTest.java

@@ -16,9 +16,10 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import de.stklcode.jvault.connector.model.response.embedded.AuthData;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.Test;
 
 import java.util.Map;
@@ -32,7 +33,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.6.2
  */
-class AuthResponseTest {
+class AuthResponseTest extends AbstractModelTest<AuthResponse> {
     private static final String AUTH_ACCESSOR = "2c84f488-2133-4ced-87b0-570f93a76830";
     private static final String AUTH_CLIENT_TOKEN = "ABCD";
     private static final String AUTH_POLICY_1 = "web";
@@ -68,15 +69,18 @@ class AuthResponseTest {
             "  }\n" +
             "}";
 
-    /**
+    AuthResponseTest() {
-     * Test getter, setter and get-methods for response data.
+        super(AuthResponse.class);
-     */
+    }
-    @Test
+
-    void getDataRoundtrip() {
+    @Override
-        // Create empty Object.
+    protected AuthResponse createFull() {
-        AuthResponse res = new AuthResponse();
+        try {
-        // TODO
+            return new ObjectMapper().readValue(RES_JSON, AuthResponse.class);
-//        assertNull(res.getData(), "Initial data should be empty");
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
     }
 
     /**
@@ -105,9 +109,4 @@ class AuthResponseTest {
         assertTrue(data.getTokenPolicies().containsAll(Set.of(AUTH_POLICY_2, AUTH_POLICY_1)), "Incorrect token policies");
         assertEquals(Map.of(AUTH_META_KEY, AUTH_META_VALUE), data.getMetadata(), "Incorrect auth metadata");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(AuthResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/CredentialsResponseTest.java

@@ -16,9 +16,10 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -29,7 +30,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.8
  */
-class CredentialsResponseTest {
+class CredentialsResponseTest extends AbstractModelTest<CredentialsResponse> {
     private static final String VAL_USER = "testUserName";
     private static final String VAL_PASS = "5up3r5ecr3tP455";
     private static final String JSON = "{\n" +
@@ -44,6 +45,20 @@ class CredentialsResponseTest {
             "    \"warnings\": null\n" +
             "}";
 
+    CredentialsResponseTest() {
+        super(CredentialsResponse.class);
+    }
+
+    @Override
+    protected CredentialsResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(JSON, CredentialsResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test getter, setter and get-methods for response data.
      *
@@ -63,9 +78,4 @@ class CredentialsResponseTest {
         assertEquals(VAL_USER, res.getUsername(), "Incorrect username");
         assertEquals(VAL_PASS, res.getPassword(), "Incorrect password");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(CredentialsResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/ErrorResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
@@ -29,13 +30,27 @@ import static org.junit.jupiter.api.Assertions.*;
  *
  * @author Stefan Kalscheuer
  */
-class ErrorResponseTest {
+class ErrorResponseTest extends AbstractModelTest<ErrorResponse> {
     private static final String ERROR_1 = "Error #1";
     private static final String ERROR_2 = "Error #2";
 
     private static final String JSON = "{\"errors\":[\"" + ERROR_1 + "\",\"" + ERROR_2 + "\"]}";
     private static final String JSON_EMPTY = "{\"errors\":[]}";
 
+    ErrorResponseTest() {
+        super(ErrorResponse.class);
+    }
+
+    @Override
+    protected ErrorResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(JSON, ErrorResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault.
      */
@@ -72,9 +87,4 @@ class ErrorResponseTest {
 
         assertEquals("error response", new ErrorResponse().toString());
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(ErrorResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/HealthResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -28,7 +29,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.7.0
  */
-class HealthResponseTest {
+class HealthResponseTest extends AbstractModelTest<HealthResponse> {
     private static final String CLUSTER_ID = "c9abceea-4f46-4dab-a688-5ce55f89e228";
     private static final String CLUSTER_NAME = "vault-cluster-5515c810";
     private static final String VERSION = "0.9.2";
@@ -53,6 +54,20 @@ class HealthResponseTest {
             "  \"performance_standby\": " + PERF_STANDBY + "\n" +
             "}";
 
+    HealthResponseTest() {
+        super(HealthResponse.class);
+    }
+
+    @Override
+    protected HealthResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(RES_JSON, HealthResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
      */
@@ -74,9 +89,4 @@ class HealthResponseTest {
         assertEquals(REPL_PERF_MODE, res.getReplicationPerfMode(), "Incorrect replication perf mode");
         assertEquals(REPL_DR_MODE, res.getReplicationDrMode(), "Incorrect replication DR mode");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(HealthResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/HelpResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -27,11 +28,25 @@ import static org.junit.jupiter.api.Assertions.*;
  *
  * @author Stefan Kalscheuer
  */
-class HelpResponseTest {
+class HelpResponseTest extends AbstractModelTest<HelpResponse> {
     private static final String HELP = "Help Text.";
 
     private static final String JSON = "{\"help\":\"" + HELP + "\"}";
 
+    HelpResponseTest() {
+        super(HelpResponse.class);
+    }
+
+    @Override
+    protected HelpResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(JSON, HelpResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault.
      */
@@ -50,9 +65,4 @@ class HelpResponseTest {
                 "Unexpected JSON string after serialization"
         );
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(HelpResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/MetaSecretResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
@@ -25,12 +26,12 @@ import java.util.List;
 import static org.junit.jupiter.api.Assertions.*;
 
 /**
- * JUnit Test for {@link SecretResponse} model.
+ * JUnit Test for {@link MetaSecretResponse} model.
  *
  * @author Stefan Kalscheuer
  * @since 0.6.2
  */
-class SecretResponseTest {
+class MetaSecretResponseTest extends AbstractModelTest<MetaSecretResponse> {
     private static final String SECRET_REQUEST_ID = "68315073-6658-e3ff-2da7-67939fb91bbd";
     private static final String SECRET_LEASE_ID = "";
     private static final Integer SECRET_LEASE_DURATION = 2764800;
@@ -42,17 +43,6 @@ class SecretResponseTest {
     private static final String SECRET_META_CREATED = "2018-03-22T02:24:06.945319214Z";
     private static final String SECRET_META_DELETED = "2018-03-23T03:25:07.056420325Z";
     private static final List<String> SECRET_WARNINGS = null;
-    private static final String SECRET_JSON = "{\n" +
-            "    \"request_id\": \"" + SECRET_REQUEST_ID + "\",\n" +
-            "    \"lease_id\": \"" + SECRET_LEASE_ID + "\",\n" +
-            "    \"lease_duration\": " + SECRET_LEASE_DURATION + ",\n" +
-            "    \"renewable\": " + SECRET_RENEWABLE + ",\n" +
-            "    \"data\": {\n" +
-            "        \"" + SECRET_DATA_K1 + "\": \"" + SECRET_DATA_V1 + "\",\n" +
-            "        \"" + SECRET_DATA_K2 + "\": \"" + SECRET_DATA_V2 + "\"\n" +
-            "    },\n" +
-            "    \"warnings\": " + SECRET_WARNINGS + "\n" +
-            "}";
     private static final String SECRET_JSON_V2 = "{\n" +
             "    \"request_id\": \"" + SECRET_REQUEST_ID + "\",\n" +
             "    \"lease_id\": \"" + SECRET_LEASE_ID + "\",\n" +
@@ -92,19 +82,27 @@ class SecretResponseTest {
             "    \"warnings\": " + SECRET_WARNINGS + "\n" +
             "}";
 
+    MetaSecretResponseTest() {
+        super(MetaSecretResponse.class);
+    }
+
+    @Override
+    protected MetaSecretResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(SECRET_JSON_V2, MetaSecretResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
      */
     @Test
     void jsonRoundtrip() {
-        SecretResponse res = assertDoesNotThrow(
-                () -> new ObjectMapper().readValue(SECRET_JSON, PlainSecretResponse.class),
-                "SecretResponse deserialization failed"
-        );
-        assertSecretData(res);
-
         // KV v2 secret.
-        res = assertDoesNotThrow(
+        MetaSecretResponse res = assertDoesNotThrow(
                 () -> new ObjectMapper().readValue(SECRET_JSON_V2, MetaSecretResponse.class),
                 "SecretResponse deserialization failed"
         );
@@ -132,13 +130,6 @@ class SecretResponseTest {
         assertEquals(2, res.getMetadata().getVersion(), "Incorrect secret version");
     }
 
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(SecretResponse.class).verify();
-        EqualsVerifier.simple().forClass(PlainSecretResponse.class).verify();
-        EqualsVerifier.simple().forClass(MetaSecretResponse.class).verify();
-    }
-
     private void assertSecretData(SecretResponse res) {
         assertNotNull(res, "Parsed response is NULL");
         assertEquals(SECRET_LEASE_ID, res.getLeaseId(), "Incorrect lease ID");

src/test/java/de/stklcode/jvault/connector/model/response/MetadataResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -28,7 +29,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.8
  */
-class MetadataResponseTest {
+class MetadataResponseTest extends AbstractModelTest<MetadataResponse> {
     private static final String V1_TIME = "2018-03-22T02:24:06.945319214Z";
     private static final String V3_TIME = "2018-03-22T02:36:43.986212308Z";
     private static final String V2_TIME = "2018-03-22T02:36:33.954880664Z";
@@ -63,6 +64,20 @@ class MetadataResponseTest {
             "  }\n" +
             "}";
 
+    MetadataResponseTest() {
+        super(MetadataResponse.class);
+    }
+
+    @Override
+    protected MetadataResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(META_JSON, MetadataResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
      */
@@ -89,9 +104,4 @@ class MetadataResponseTest {
         assertNotNull(res.getMetadata().getVersions().get(2).getCreatedTime(), "Parsing version created failed");
         assertFalse(res.getMetadata().getVersions().get(3).isDestroyed(), "Incorrect version 3 destroyed state");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(MetadataResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/PlainSecretResponseTest.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2016-2021 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * JUnit Test for {@link PlainSecretResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.6.2
+ */
+class PlainSecretResponseTest extends AbstractModelTest<PlainSecretResponse> {
+    private static final String SECRET_REQUEST_ID = "68315073-6658-e3ff-2da7-67939fb91bbd";
+    private static final String SECRET_LEASE_ID = "";
+    private static final Integer SECRET_LEASE_DURATION = 2764800;
+    private static final boolean SECRET_RENEWABLE = false;
+    private static final String SECRET_DATA_K1 = "excited";
+    private static final String SECRET_DATA_V1 = "yes";
+    private static final String SECRET_DATA_K2 = "value";
+    private static final String SECRET_DATA_V2 = "world";
+    private static final List<String> SECRET_WARNINGS = null;
+    private static final String SECRET_JSON = "{\n" +
+            "    \"request_id\": \"" + SECRET_REQUEST_ID + "\",\n" +
+            "    \"lease_id\": \"" + SECRET_LEASE_ID + "\",\n" +
+            "    \"lease_duration\": " + SECRET_LEASE_DURATION + ",\n" +
+            "    \"renewable\": " + SECRET_RENEWABLE + ",\n" +
+            "    \"data\": {\n" +
+            "        \"" + SECRET_DATA_K1 + "\": \"" + SECRET_DATA_V1 + "\",\n" +
+            "        \"" + SECRET_DATA_K2 + "\": \"" + SECRET_DATA_V2 + "\"\n" +
+            "    },\n" +
+            "    \"warnings\": " + SECRET_WARNINGS + "\n" +
+            "}";
+
+    PlainSecretResponseTest() {
+        super(PlainSecretResponse.class);
+    }
+
+    @Override
+    protected PlainSecretResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(SECRET_JSON, PlainSecretResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
+    /**
+     * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
+     */
+    @Test
+    void jsonRoundtrip() {
+        SecretResponse res = assertDoesNotThrow(
+                () -> new ObjectMapper().readValue(SECRET_JSON, PlainSecretResponse.class),
+                "SecretResponse deserialization failed"
+        );
+
+        assertNotNull(res, "Parsed response is NULL");
+        assertEquals(SECRET_LEASE_ID, res.getLeaseId(), "Incorrect lease ID");
+        assertEquals(SECRET_LEASE_DURATION, res.getLeaseDuration(), "Incorrect lease duration");
+        assertEquals(SECRET_RENEWABLE, res.isRenewable(), "Incorrect renewable status");
+        assertEquals(SECRET_WARNINGS, res.getWarnings(), "Incorrect warnings");
+        assertEquals(SECRET_DATA_V1, res.get(SECRET_DATA_K1), "Response does not contain correct data");
+        assertEquals(SECRET_DATA_V2, res.get(SECRET_DATA_K2), "Response does not contain correct data");
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/SealResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -28,7 +29,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.8
  */
-class SealResponseTest {
+class SealResponseTest extends AbstractModelTest<SealResponse> {
     private static final String TYPE = "shamir";
     private static final Integer THRESHOLD = 3;
     private static final Integer SHARES = 5;
@@ -72,6 +73,20 @@ class SealResponseTest {
             "  \"storage_type\": \"" + STORAGE_TYPE + "\"\n" +
             "}";
 
+    SealResponseTest() {
+        super(SealResponse.class);
+    }
+
+    @Override
+    protected SealResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(RES_UNSEALED, SealResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault when sealed (JSON example close to Vault documentation).
      */
@@ -119,9 +134,4 @@ class SealResponseTest {
         assertEquals(RECOVERY_SEAL, res.getRecoverySeal(), "Incorrect recovery seal");
         assertEquals(STORAGE_TYPE, res.getStorageType(), "Incorrect storage type");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(SealResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/SecretListResponseTest.java

@@ -16,14 +16,14 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
 
-import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.*;
-import static org.junit.jupiter.api.Assertions.assertEquals;
 
 /**
  * JUnit Test for {@link SecretListResponse} model.
@@ -31,7 +31,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
  * @author Stefan Kalscheuer
  * @since 0.8
  */
-class SecretListResponseTest {
+class SecretListResponseTest extends AbstractModelTest<SecretListResponse> {
     private static final String KEY1 = "key1";
     private static final String KEY2 = "key-2";
     private static final String JSON = "{\n" +
@@ -47,6 +47,20 @@ class SecretListResponseTest {
             "  \"renewable\": false\n" +
             "}";
 
+    SecretListResponseTest() {
+        super(SecretListResponse.class);
+    }
+
+    @Override
+    protected SecretListResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(JSON, SecretListResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test JSON deserialization and key getter.
      */
@@ -59,9 +73,4 @@ class SecretListResponseTest {
 
         assertEquals(List.of(KEY1, KEY2), res.getKeys(), "Unexpected secret keys");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(SecretListResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/SecretVersionResponseTest.java

@@ -16,8 +16,9 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import nl.jqno.equalsverifier.EqualsVerifier;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -28,7 +29,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.8
  */
-class SecretVersionResponseTest {
+class SecretVersionResponseTest extends AbstractModelTest<SecretVersionResponse> {
     private static final String CREATION_TIME = "2018-03-22T02:24:06.945319214Z";
     private static final String DELETION_TIME = "2018-03-22T02:36:43.986212308Z";
     private static final Integer VERSION = 42;
@@ -42,6 +43,20 @@ class SecretVersionResponseTest {
             "  }\n" +
             "}";
 
+    SecretVersionResponseTest() {
+        super(SecretVersionResponse.class);
+    }
+
+    @Override
+    protected SecretVersionResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(META_JSON, SecretVersionResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
      */
@@ -58,9 +73,4 @@ class SecretVersionResponseTest {
         assertFalse(res.getMetadata().isDestroyed(), "Incorrect destroyed state");
         assertEquals(VERSION, res.getMetadata().getVersion(), "Incorrect version");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(SecretVersionResponse.class).verify();
-    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/TokenResponseTest.java

@@ -16,9 +16,10 @@
 
 package de.stklcode.jvault.connector.model.response;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.model.AbstractModelTest;
 import de.stklcode.jvault.connector.model.response.embedded.TokenData;
-import nl.jqno.equalsverifier.EqualsVerifier;
 import org.junit.jupiter.api.Test;
 
 import java.time.ZonedDateTime;
@@ -33,7 +34,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author Stefan Kalscheuer
  * @since 0.6.2
  */
-class TokenResponseTest {
+class TokenResponseTest extends AbstractModelTest<TokenResponse> {
     private static final Integer TOKEN_CREATION_TIME = 1457533232;
     private static final Integer TOKEN_TTL = 2764800;
     private static final Integer TOKEN_EXPLICIT_MAX_TTL = 0;
@@ -88,6 +89,20 @@ class TokenResponseTest {
             "  \"auth\": null\n" +
             "}";
 
+    TokenResponseTest() {
+        super(TokenResponse.class);
+    }
+
+    @Override
+    protected TokenResponse createFull() {
+        try {
+            return new ObjectMapper().readValue(RES_JSON, TokenResponse.class);
+        } catch (JsonProcessingException e) {
+            fail("Creation of full model instance failed", e);
+            return null;
+        }
+    }
+
     /**
      * Test getter, setter and get-methods for response data.
      */
@@ -135,9 +150,4 @@ class TokenResponseTest {
         assertEquals(RES_TTL, data.getTtl(), "Incorrect token TTL");
         assertEquals(TOKEN_TYPE, data.getType(), "Incorrect token type");
     }
-
-    @Test
-    void testEqualsHashcode() {
-        EqualsVerifier.simple().forClass(TokenResponse.class).verify();
-    }
 }