diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/csharpnetcore/CSharpNetCoreClientDeepObjectTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/csharpnetcore/CSharpNetCoreClientDeepObjectTest.java
index 05dbe6cc9b234b1c1da6dc79b7e969be2e067035..44b44b5b73b3a75f8d3c2bc971c86f3a34dbdb8a 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/csharpnetcore/CSharpNetCoreClientDeepObjectTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/csharpnetcore/CSharpNetCoreClientDeepObjectTest.java
@@ -23,7 +23,6 @@ import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.DefaultGenerator;
 import org.openapitools.codegen.languages.CSharpNetCoreClientCodegen;
-import org.openapitools.codegen.languages.JavaClientCodegen;
 import org.testng.annotations.Test;
 
 import java.io.File;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioClientCodegenTest.java
index 0e57791ce2f21854abfcf42007b526da8cfc65c8..9746392e059abf44cb71b92907c4bcc5489faf30 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioClientCodegenTest.java
@@ -26,7 +26,6 @@ import java.util.List;
 import java.util.Locale;
 import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.languages.DartDioClientCodegen;
-import org.openapitools.codegen.languages.DartDioClientCodegen;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioModelTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioModelTest.java
index adc15af510015b1c0d9d2e6b245129b0c5469eb6..95449c3edb9ff39dac760043c91e0a93039b8bfe 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioModelTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioModelTest.java
@@ -18,7 +18,6 @@
 package org.openapitools.codegen.dart.dio;
 
 import io.swagger.v3.oas.models.OpenAPI;
-import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.DateSchema;
 import io.swagger.v3.oas.models.media.DateTimeSchema;
@@ -26,17 +25,11 @@ import io.swagger.v3.oas.models.media.IntegerSchema;
 import io.swagger.v3.oas.models.media.MapSchema;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.media.StringSchema;
-import org.openapitools.codegen.ClientOptInput;
-import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.CodegenModel;
-import org.openapitools.codegen.CodegenOperation;
 import org.openapitools.codegen.CodegenProperty;
 import org.openapitools.codegen.DefaultCodegen;
-import org.openapitools.codegen.DefaultGenerator;
 import org.openapitools.codegen.TestUtils;
-import org.openapitools.codegen.config.CodegenConfigurator;
 import org.openapitools.codegen.languages.DartDioClientCodegen;
-import org.slf4j.LoggerFactory;
 import org.testng.Assert;
 import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioNextModelTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioNextModelTest.java
index 928647ae681a3dcdd759028fecb813be1390ab45..1190240faa0a32c5a604e7169ef7668735e2f327 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioNextModelTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioNextModelTest.java
@@ -20,7 +20,6 @@ import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.media.*;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.DartDioNextClientCodegen;
-import org.openapitools.codegen.languages.DartDioNextClientCodegen;
 import org.testng.Assert;
 import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/fsharp/FSharpServerCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/fsharp/FSharpServerCodegenTest.java
index 585ec9188def34686e94e638e3fa7439e106f46a..4aedd500a4a5633b4b7b1c2ab2d82fd7a97d3895 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/fsharp/FSharpServerCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/fsharp/FSharpServerCodegenTest.java
@@ -16,7 +16,6 @@
 
 package org.openapitools.codegen.fsharp;
 import org.openapitools.codegen.CodegenModel;
-import org.openapitools.codegen.CodegenProperty;
 import org.openapitools.codegen.languages.AbstractFSharpCodegen;
 import org.openapitools.codegen.languages.FsharpGiraffeServerCodegen;
 import org.testng.Assert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/go/AbstractGoCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/go/AbstractGoCodegenTest.java
index b1e0d924fa82efd924247f73c3860e407a0b50b0..f5b730e1ccf60da2545faca2ac05d5ac4ead5efd 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/go/AbstractGoCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/go/AbstractGoCodegenTest.java
@@ -25,7 +25,6 @@ import io.swagger.v3.oas.models.media.MapSchema;
 import io.swagger.v3.oas.models.media.Schema;
 import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.CodegenType;
-import org.openapitools.codegen.java.AbstractJavaCodegenTest;
 import org.openapitools.codegen.languages.AbstractGoCodegen;
 import org.openapitools.codegen.utils.ModelUtils;
 import org.testng.Assert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/haskellservant/HaskellServantCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/haskellservant/HaskellServantCodegenTest.java
index cfb85d538bea10262e87c9dc6020d58cabdec765..4e7b149546b86b5edae3ce23b3d17b4d6d6bb583 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/haskellservant/HaskellServantCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/haskellservant/HaskellServantCodegenTest.java
@@ -16,18 +16,12 @@
 
 package org.openapitools.codegen.haskellservant;
 
-import static org.testng.Assert.assertFalse;
-import static org.testng.Assert.assertNotNull;
-
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.util.Arrays;
-
 import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.DefaultGenerator;
-import org.openapitools.codegen.MockDefaultGenerator;
 import org.openapitools.codegen.TestUtils;
 import org.openapitools.codegen.languages.HaskellServantCodegen;
 import org.testng.annotations.Test;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSCXFExtServerCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSCXFExtServerCodegenTest.java
index 0c0409546121fbf80caa87d3ea78fb5f2346e03e..893e8c8cba68564d556644dd605caffac371cc9a 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSCXFExtServerCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSCXFExtServerCodegenTest.java
@@ -5,7 +5,6 @@ import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.servers.Server;
 import io.swagger.v3.parser.core.models.ParseOptions;
 import org.openapitools.codegen.*;
-import org.openapitools.codegen.MockDefaultGenerator.WrittenTemplateBasedFile;
 import org.openapitools.codegen.languages.AbstractJavaCodegen;
 import org.openapitools.codegen.languages.AbstractJavaJAXRSServerCodegen;
 import org.openapitools.codegen.languages.JavaCXFExtServerCodegen;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSSpecServerCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSSpecServerCodegenTest.java
index 5668a4398bdafaea54b59905a3c605d43477aa45..9d32f0929f7dc2327ffc977baf9f76331bf2aa65 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSSpecServerCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJAXRSSpecServerCodegenTest.java
@@ -4,9 +4,6 @@ import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.media.ArraySchema;
-import io.swagger.v3.oas.models.media.Content;
-import io.swagger.v3.oas.models.media.MediaType;
-import io.swagger.v3.oas.models.responses.ApiResponse;
 import io.swagger.v3.oas.models.servers.Server;
 import io.swagger.v3.parser.core.models.ParseOptions;
 
@@ -31,7 +28,6 @@ import java.util.Map;
 
 import static org.openapitools.codegen.TestUtils.assertFileContains;
 import static org.openapitools.codegen.TestUtils.validateJavaSourceFiles;
-import static org.testng.Assert.assertEquals;
 import static org.testng.Assert.assertTrue;
 
 /**
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJaxrsResteasyServerCodegenModelTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJaxrsResteasyServerCodegenModelTest.java
index 515277fd21f69ae06ef2c6f89ff5bd7024094e3c..9b2670665badd249890aaf6215722db964136f43 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJaxrsResteasyServerCodegenModelTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJaxrsResteasyServerCodegenModelTest.java
@@ -7,7 +7,6 @@ import io.swagger.v3.oas.models.media.Schema;
 import org.openapitools.codegen.CodegenModel;
 import org.openapitools.codegen.CodegenOperation;
 import org.openapitools.codegen.CodegenParameter;
-import org.openapitools.codegen.CodegenProperty;
 import org.openapitools.codegen.TestUtils;
 import org.openapitools.codegen.languages.JavaResteasyServerCodegen;
 import org.testng.Assert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJerseyServerCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJerseyServerCodegenTest.java
index fb950fbe5522872887fcb814c6a4fde2f2d0d6e1..54e122aa03c9ea370b666508c68688b34b205ac2 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJerseyServerCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jaxrs/JavaJerseyServerCodegenTest.java
@@ -3,21 +3,13 @@ package org.openapitools.codegen.java.jaxrs;
 import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.servers.Server;
-import io.swagger.v3.oas.models.Operation;
-import io.swagger.v3.oas.models.info.Info;
-import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.parser.core.models.ParseOptions;
 
 import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.CodegenConstants;
-import org.openapitools.codegen.CodegenOperation;
 import org.openapitools.codegen.DefaultCodegen;
-import org.openapitools.codegen.MockDefaultGenerator;
-import org.openapitools.codegen.MockDefaultGenerator.WrittenTemplateBasedFile;
-import org.openapitools.codegen.TestUtils;
 import org.openapitools.codegen.languages.JavaJerseyServerCodegen;
 import org.openapitools.codegen.languages.features.CXFServerFeatures;
-import org.openapitools.codegen.templating.MustacheEngineAdapter;
 import org.openapitools.codegen.DefaultGenerator;
 import org.testng.Assert;
 import org.testng.annotations.BeforeMethod;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/javascript/JavascriptClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/javascript/JavascriptClientCodegenTest.java
index f81ba9f22a89f770b98dc4013277b29cdb5bad9a..c594cbb90bf9a2624c895ba2a846458ad8396c72 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/javascript/JavascriptClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/javascript/JavascriptClientCodegenTest.java
@@ -17,13 +17,9 @@
 
 package org.openapitools.codegen.javascript;
 
-import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
-import io.swagger.v3.oas.models.media.ArraySchema;
-import io.swagger.v3.oas.models.media.MediaType;
 import io.swagger.v3.oas.models.media.Schema;
-import io.swagger.v3.oas.models.parameters.RequestBody;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.JavascriptClientCodegen;
 import org.testng.Assert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/AbstractKotlinCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/AbstractKotlinCodegenTest.java
index a64430245064e0f07e9462d3ccf5a1ecdfe68d48..3c9781bd63eb94eaf88f5271cce230e4d16a9591 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/AbstractKotlinCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/AbstractKotlinCodegenTest.java
@@ -16,7 +16,6 @@ import org.testng.Assert;
 import org.testng.annotations.Test;
 
 import java.io.File;
-import java.util.HashSet;
 import java.util.Map;
 import java.util.function.Function;
 import java.util.stream.Collectors;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/KotlinTestUtils.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/KotlinTestUtils.java
index 4f43823c19364c2a3cf0e4a09d807086ad99402a..a86cf6f139757934e47dbcb58cc0e44250074a41 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/KotlinTestUtils.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/KotlinTestUtils.java
@@ -20,7 +20,6 @@ import java.io.*;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
-import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.util.*;
 
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/ktorm/KtormSchemaCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/ktorm/KtormSchemaCodegenTest.java
index dfa21078b9dd23980951dd43d69b8f7b9d9bd3d6..bad3d2a3ccfb0ba978ede550e9c9afb776d63eae 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/ktorm/KtormSchemaCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/ktorm/KtormSchemaCodegenTest.java
@@ -18,7 +18,6 @@ package org.openapitools.codegen.ktorm;
 
 import org.openapitools.codegen.CodegenModel;
 import org.openapitools.codegen.CodegenProperty;
-import org.openapitools.codegen.DefaultCodegen;
 import org.openapitools.codegen.TestUtils;
 import org.openapitools.codegen.languages.KtormSchemaCodegen;
 import org.testng.Assert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/NimClientCodegenOptionsProvider.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/NimClientCodegenOptionsProvider.java
index 24cad9416a5ae5e923d75afacd83c89f31c6b9fd..c5e5eb63aa5d79fb225ad8283f92f58c7a100694 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/NimClientCodegenOptionsProvider.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/NimClientCodegenOptionsProvider.java
@@ -1,6 +1,5 @@
 package org.openapitools.codegen.options;
 
-import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.languages.NimClientCodegen;
 
 import com.google.common.collect.ImmutableMap;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientTest.java
index e133911796b5930b6d231a11be5f69b8992b3a1c..4face161d7e876a837e7ffe3ee31a28fe9127c99 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientTest.java
@@ -16,17 +16,8 @@
 
 package org.openapitools.codegen.python;
 import com.google.common.io.Resources;
-import io.swagger.v3.oas.models.PathItem;
-import io.swagger.v3.oas.models.Paths;
-import io.swagger.v3.oas.models.parameters.RequestBody;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.io.PrintWriter;
 import java.nio.charset.StandardCharsets;
-import javax.validation.constraints.AssertTrue;
-import org.apache.commons.io.IOUtils;
 import org.openapitools.codegen.config.CodegenConfigurator;
 
 import com.google.common.collect.Sets;
@@ -47,7 +38,6 @@ import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.PythonClientCodegen;
 import org.openapitools.codegen.utils.ModelUtils;
 import org.testng.Assert;
-import org.testng.TestNGAntTask.Mode;
 import org.testng.annotations.Test;
 
 @SuppressWarnings("static-method")
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonLegacyClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonLegacyClientCodegenTest.java
index 45c784f40ed6458291ec817aca4074d287c667fa..d3bff53a8eaf82d12a82483371fbc6cfc6e05560 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonLegacyClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonLegacyClientCodegenTest.java
@@ -24,13 +24,11 @@ import io.swagger.v3.oas.models.media.*;
 import io.swagger.v3.parser.util.SchemaTypeUtil;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.PythonLegacyClientCodegen;
-import org.openapitools.codegen.utils.ModelUtils;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.regex.Pattern;
 
 public class PythonLegacyClientCodegenTest {
 
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/rubysinatra/RubySinatraServerOptionsTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/rubysinatra/RubySinatraServerOptionsTest.java
index 33623381607c74ecacb2eec55e977694a8d4d798..9971da32afd2b5dfa185baf5dc253c230ed3d46f 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/rubysinatra/RubySinatraServerOptionsTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/rubysinatra/RubySinatraServerOptionsTest.java
@@ -23,7 +23,6 @@ import org.openapitools.codegen.languages.RubySinatraServerCodegen;
 import org.openapitools.codegen.options.RubySinatraServerOptionsProvider;
 
 import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.verify;
 
 public class RubySinatraServerOptionsTest extends AbstractOptionsTest {
     private RubySinatraServerCodegen clientCodegen = mock(RubySinatraServerCodegen.class, mockSettings);
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/scalaakka/ScalaAkkaClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/scalaakka/ScalaAkkaClientCodegenTest.java
index 03a08b567595005d822246bd8ee705882095d5a0..d78b487d28605fe6071808d630d5f903e68728a9 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/scalaakka/ScalaAkkaClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/scalaakka/ScalaAkkaClientCodegenTest.java
@@ -24,7 +24,6 @@ import io.swagger.v3.oas.models.media.*;
 import io.swagger.v3.parser.util.SchemaTypeUtil;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.config.CodegenConfigurator;
-import org.openapitools.codegen.config.GlobalSettings;
 import org.openapitools.codegen.languages.ScalaAkkaClientCodegen;
 import org.testng.Assert;
 import org.testng.annotations.Test;