diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/AbstractAnnotationAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/AbstractAnnotationAssert.java
index 8f8351103d5..05b53d5fa09 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/AbstractAnnotationAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/AbstractAnnotationAssert.java
@@ -7,6 +7,7 @@ import java.util.Objects;
 import java.util.stream.Collectors;
 
 import org.assertj.core.api.ListAssert;
+import org.assertj.core.util.CanIgnoreReturnValue;
 
 import com.github.javaparser.ast.expr.AnnotationExpr;
 import com.github.javaparser.ast.expr.MarkerAnnotationExpr;
@@ -15,6 +16,7 @@ import com.github.javaparser.ast.expr.SingleMemberAnnotationExpr;
 import com.github.javaparser.ast.nodeTypes.NodeWithSimpleName;
 import com.google.common.collect.ImmutableMap;
 
+@CanIgnoreReturnValue
 public abstract class AbstractAnnotationAssert<ACTUAL extends AbstractAnnotationAssert<ACTUAL>> extends ListAssert<AnnotationExpr> {
 
     protected AbstractAnnotationAssert(final List<AnnotationExpr> annotationExpr) {
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/JavaFileAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/JavaFileAssert.java
index cf48a71930c..3189c408663 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/JavaFileAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/JavaFileAssert.java
@@ -10,6 +10,7 @@ import java.util.stream.Collectors;
 
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.Assertions;
+import org.assertj.core.util.CanIgnoreReturnValue;
 
 import com.github.javaparser.StaticJavaParser;
 import com.github.javaparser.ast.CompilationUnit;
@@ -17,6 +18,7 @@ import com.github.javaparser.ast.body.FieldDeclaration;
 import com.github.javaparser.ast.body.MethodDeclaration;
 import com.github.javaparser.ast.nodeTypes.NodeWithName;
 
+@CanIgnoreReturnValue
 public class JavaFileAssert extends AbstractAssert<JavaFileAssert, CompilationUnit> {
 
     private JavaFileAssert(final CompilationUnit actual) {
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAnnotationAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAnnotationAssert.java
index 60fc9d6f8fd..5667e29a4dc 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAnnotationAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAnnotationAssert.java
@@ -2,8 +2,11 @@ package org.openapitools.codegen.java.assertions;
 
 import java.util.List;
 
+import org.assertj.core.util.CanIgnoreReturnValue;
+
 import com.github.javaparser.ast.expr.AnnotationExpr;
 
+@CanIgnoreReturnValue
 public class MethodAnnotationAssert extends AbstractAnnotationAssert<MethodAnnotationAssert> {
 
     private final MethodAssert methodAssert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAssert.java
index e9d30232875..37ab7d6028d 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/MethodAssert.java
@@ -6,13 +6,14 @@ import java.util.stream.Collectors;
 
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.Assertions;
+import org.assertj.core.util.CanIgnoreReturnValue;
 
-import com.github.javaparser.ast.Node;
 import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
 import com.github.javaparser.ast.body.MethodDeclaration;
 import com.github.javaparser.ast.body.Parameter;
 import com.github.javaparser.ast.nodeTypes.NodeWithName;
 
+@CanIgnoreReturnValue
 public class MethodAssert extends AbstractAssert<MethodAssert, MethodDeclaration> {
 
     private final JavaFileAssert fileAssert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAnnotationAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAnnotationAssert.java
index 7348d34f04c..184943bd4da 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAnnotationAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAnnotationAssert.java
@@ -2,8 +2,11 @@ package org.openapitools.codegen.java.assertions;
 
 import java.util.List;
 
+import org.assertj.core.util.CanIgnoreReturnValue;
+
 import com.github.javaparser.ast.expr.AnnotationExpr;
 
+@CanIgnoreReturnValue
 public class ParameterAnnotationAssert extends AbstractAnnotationAssert<ParameterAnnotationAssert> {
 
     private final ParameterAssert parameterAssert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAssert.java
index 6fe73ce5899..a6a4a732cc9 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/ParameterAssert.java
@@ -2,9 +2,11 @@ package org.openapitools.codegen.java.assertions;
 
 import org.assertj.core.api.Assertions;
 import org.assertj.core.api.ObjectAssert;
+import org.assertj.core.util.CanIgnoreReturnValue;
 
 import com.github.javaparser.ast.body.Parameter;
 
+@CanIgnoreReturnValue
 public class ParameterAssert extends ObjectAssert<Parameter> {
 
     private final MethodAssert methodAssert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAnnotationAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAnnotationAssert.java
index 3db06d49aed..92636a90730 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAnnotationAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAnnotationAssert.java
@@ -2,8 +2,11 @@ package org.openapitools.codegen.java.assertions;
 
 import java.util.List;
 
+import org.assertj.core.util.CanIgnoreReturnValue;
+
 import com.github.javaparser.ast.expr.AnnotationExpr;
 
+@CanIgnoreReturnValue
 public class PropertyAnnotationAssert extends AbstractAnnotationAssert<PropertyAnnotationAssert> {
 
     private final PropertyAssert propertyAssert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAssert.java
index 476b530f4b2..9cf733a05a8 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/PropertyAssert.java
@@ -2,10 +2,11 @@ package org.openapitools.codegen.java.assertions;
 
 import org.assertj.core.api.Assertions;
 import org.assertj.core.api.ObjectAssert;
+import org.assertj.core.util.CanIgnoreReturnValue;
 
 import com.github.javaparser.ast.body.FieldDeclaration;
-import com.github.javaparser.ast.body.Parameter;
 
+@CanIgnoreReturnValue
 public class PropertyAssert extends ObjectAssert<FieldDeclaration> {
 
     private final JavaFileAssert javaFileAssert;
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/TypeAnnotationAssert.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/TypeAnnotationAssert.java
index 286474fa29e..f8418510049 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/TypeAnnotationAssert.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/assertions/TypeAnnotationAssert.java
@@ -2,8 +2,11 @@ package org.openapitools.codegen.java.assertions;
 
 import java.util.List;
 
+import org.assertj.core.util.CanIgnoreReturnValue;
+
 import com.github.javaparser.ast.expr.AnnotationExpr;
 
+@CanIgnoreReturnValue
 public class TypeAnnotationAssert extends AbstractAnnotationAssert<TypeAnnotationAssert> {
 
     private final JavaFileAssert fileAssert;