diff --git a/src/main/java/io/jenkins/plugins/checks/api/ChecksAction.java b/src/main/java/io/jenkins/plugins/checks/api/ChecksAction.java
index b153be98..d802169b 100644
--- a/src/main/java/io/jenkins/plugins/checks/api/ChecksAction.java
+++ b/src/main/java/io/jenkins/plugins/checks/api/ChecksAction.java
@@ -51,4 +51,13 @@ public Optional<String> getDescription() {
     public Optional<String> getIdentifier() {
         return Optional.ofNullable(identifier);
     }
+
+    @Override
+    public String toString() {
+        return "ChecksAction{"
+                + "label='" + label + '\''
+                + ", description='" + description + '\''
+                + ", identifier='" + identifier + '\''
+                + '}';
+    }
 }
diff --git a/src/main/java/io/jenkins/plugins/checks/api/ChecksAnnotation.java b/src/main/java/io/jenkins/plugins/checks/api/ChecksAnnotation.java
index 3f0645f7..e7ad2507 100644
--- a/src/main/java/io/jenkins/plugins/checks/api/ChecksAnnotation.java
+++ b/src/main/java/io/jenkins/plugins/checks/api/ChecksAnnotation.java
@@ -101,6 +101,21 @@ public enum ChecksAnnotationLevel {
         FAILURE
     }
 
+    @Override
+    public String toString() {
+        return "ChecksAnnotation{"
+                + "path='" + path + '\''
+                + ", startLine=" + startLine
+                + ", endLine=" + endLine
+                + ", annotationLevel=" + annotationLevel
+                + ", message='" + message + '\''
+                + ", startColumn=" + startColumn
+                + ", endColumn=" + endColumn
+                + ", title='" + title + '\''
+                + ", rawDetails='" + rawDetails + '\''
+                + '}';
+    }
+
     /**
      * Builder for {@link ChecksAnnotation}.
      */
diff --git a/src/main/java/io/jenkins/plugins/checks/api/ChecksDetails.java b/src/main/java/io/jenkins/plugins/checks/api/ChecksDetails.java
index 006fb8ad..2a27bcc8 100644
--- a/src/main/java/io/jenkins/plugins/checks/api/ChecksDetails.java
+++ b/src/main/java/io/jenkins/plugins/checks/api/ChecksDetails.java
@@ -6,6 +6,7 @@
 import java.util.List;
 import java.util.Optional;
 
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.Beta;
 
@@ -112,6 +113,20 @@ public List<ChecksAction> getActions() {
         return actions;
     }
 
+    @Override
+    public String toString() {
+        return "ChecksDetails{"
+                + "name='" + name + '\''
+                + ", detailsURL='" + detailsURL + '\''
+                + ", status=" + status
+                + ", conclusion=" + conclusion
+                + ", startedAt=" + startedAt
+                + ", completedAt=" + completedAt
+                + ", output=" + output
+                + ", actions=" + actions
+                + '}';
+    }
+
     /**
      * Builder for {@link ChecksDetails}.
      */
diff --git a/src/main/java/io/jenkins/plugins/checks/api/ChecksImage.java b/src/main/java/io/jenkins/plugins/checks/api/ChecksImage.java
index 2d4b5d2d..eb54daf3 100644
--- a/src/main/java/io/jenkins/plugins/checks/api/ChecksImage.java
+++ b/src/main/java/io/jenkins/plugins/checks/api/ChecksImage.java
@@ -60,4 +60,13 @@ public Optional<String> getImageUrl() {
     public Optional<String> getCaption() {
         return Optional.ofNullable(caption);
     }
+
+    @Override
+    public String toString() {
+        return "ChecksImage{"
+                + "alt='" + alt + '\''
+                + ", imageUrl='" + imageUrl + '\''
+                + ", caption='" + caption + '\''
+                + '}';
+    }
 }
diff --git a/src/main/java/io/jenkins/plugins/checks/api/ChecksOutput.java b/src/main/java/io/jenkins/plugins/checks/api/ChecksOutput.java
index 0672ee67..56c12cd3 100644
--- a/src/main/java/io/jenkins/plugins/checks/api/ChecksOutput.java
+++ b/src/main/java/io/jenkins/plugins/checks/api/ChecksOutput.java
@@ -62,6 +62,17 @@ public List<ChecksImage> getChecksImages() {
         return images;
     }
 
+    @Override
+    public String toString() {
+        return "ChecksOutput{"
+                + "title='" + title + '\''
+                + ", summary='" + summary + '\''
+                + ", text='" + text + '\''
+                + ", annotations=" + annotations
+                + ", images=" + images
+                + '}';
+    }
+
     /**
      * Builder for {@link ChecksOutput}.
      */
diff --git a/src/test/java/io/jenkins/plugins/checks/api/ChecksActionTest.java b/src/test/java/io/jenkins/plugins/checks/api/ChecksActionTest.java
index cf86d8f6..df4d0520 100644
--- a/src/test/java/io/jenkins/plugins/checks/api/ChecksActionTest.java
+++ b/src/test/java/io/jenkins/plugins/checks/api/ChecksActionTest.java
@@ -13,5 +13,8 @@ void shouldConstructCorrectly() {
         assertThat(action.getLabel()).isPresent().hasValue("re-run");
         assertThat(action.getDescription()).isPresent().hasValue("re-run the Jenkins build");
         assertThat(action.getIdentifier()).isPresent().hasValue("re-run id");
+
+        assertThat(action).hasToString("ChecksAction{"
+                + "label='re-run', description='re-run the Jenkins build', identifier='re-run id'}");
     }
 }
diff --git a/src/test/java/io/jenkins/plugins/checks/api/ChecksAnnotationTest.java b/src/test/java/io/jenkins/plugins/checks/api/ChecksAnnotationTest.java
index 6c871a77..29d3c00d 100644
--- a/src/test/java/io/jenkins/plugins/checks/api/ChecksAnnotationTest.java
+++ b/src/test/java/io/jenkins/plugins/checks/api/ChecksAnnotationTest.java
@@ -40,6 +40,14 @@ void shouldBuildCorrectlyWithAllFields() {
                 .hasStartColumn(Optional.of(33)).hasEndColumn(Optional.of(38))
                 .hasTitle(Optional.of(TITLE))
                 .hasRawDetails(Optional.of(RAW_DETAILS));
+
+        assertThat(annotation).hasToString("ChecksAnnotation{"
+                + "path='github-checks-api-plugin/src/main/java/io/jenkins/plugins/checks/CheckGHEventSubscriber.java'"
+                + ", startLine=20, endLine=20, annotationLevel=NOTICE"
+                + ", message='Avoid unused private fields such as 'LOGGER''"
+                + ", startColumn=33, endColumn=38, title='UnusedPrivateField'"
+                + ", rawDetails='" + RAW_DETAILS
+                + "'}");
     }
 
     @Test
diff --git a/src/test/java/io/jenkins/plugins/checks/api/ChecksDetailsTest.java b/src/test/java/io/jenkins/plugins/checks/api/ChecksDetailsTest.java
index 3c49de77..a0cefb44 100644
--- a/src/test/java/io/jenkins/plugins/checks/api/ChecksDetailsTest.java
+++ b/src/test/java/io/jenkins/plugins/checks/api/ChecksDetailsTest.java
@@ -2,7 +2,6 @@
 
 import io.jenkins.plugins.checks.api.ChecksDetails.ChecksDetailsBuilder;
 import io.jenkins.plugins.checks.api.ChecksOutput.ChecksOutputBuilder;
-import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 import java.time.LocalDateTime;
@@ -13,6 +12,7 @@
 import java.util.Optional;
 
 import static io.jenkins.plugins.checks.api.ChecksDetailsAssert.assertThat;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * Tests the class {@link ChecksDetails}.
@@ -55,13 +55,20 @@ void shouldBuildCorrectlyWithAllFields() {
                 .hasDetailsURL(Optional.of(detailsURL))
                 .hasConclusion(ChecksConclusion.SUCCESS);
 
-        Assertions.assertThat(details.getOutput())
+        assertThat(details.getOutput())
                 .usingFieldByFieldValueComparator()
                 .contains(output);
 
-        Assertions.assertThat(details.getActions())
+        assertThat(details.getActions())
                 .usingFieldByFieldElementComparator()
                 .containsExactlyElementsOf(actions);
+
+        assertThat(details).hasToString("ChecksDetails{"
+                + "name='Jenkins', detailsURL='https://ci.jenkins.io', status=COMPLETED, conclusion=SUCCESS"
+                + ", startedAt=2020-06-27T01:10, completedAt=2021-07-28T02:20"
+                + ", output=" + output.toString()
+                + ", actions=" + actions.toString()
+                + "}");
     }
 
     @Test
@@ -72,7 +79,7 @@ void shouldBuildCorrectlyWhenAddingActions() {
                 new ChecksAction("action_2", "the second action", "2"));
         actions.forEach(builder::addAction);
 
-        Assertions.assertThat(builder.build().getActions())
+        assertThat(builder.build().getActions())
                 .usingFieldByFieldElementComparator()
                 .containsExactlyInAnyOrderElementsOf(actions);
     }
diff --git a/src/test/java/io/jenkins/plugins/checks/api/ChecksImageTest.java b/src/test/java/io/jenkins/plugins/checks/api/ChecksImageTest.java
index 6e8ef109..9264fa7c 100644
--- a/src/test/java/io/jenkins/plugins/checks/api/ChecksImageTest.java
+++ b/src/test/java/io/jenkins/plugins/checks/api/ChecksImageTest.java
@@ -17,5 +17,10 @@ void shouldConstructCorrectly() {
                 .hasAlt(Optional.of("warnings-chart"))
                 .hasImageUrl(Optional.of("https://ci.jenkins.io/job/Plugins/job/warnings-ng-plugin/job/master/"))
                 .hasCaption(Optional.of("charts generated by warning-ng-plugin"));
+
+        assertThat(image).hasToString("ChecksImage{"
+                + "alt='warnings-chart'"
+                + ", imageUrl='https://ci.jenkins.io/job/Plugins/job/warnings-ng-plugin/job/master/'"
+                + ", caption='charts generated by warning-ng-plugin'}");
     }
 }
diff --git a/src/test/java/io/jenkins/plugins/checks/api/ChecksOutputTest.java b/src/test/java/io/jenkins/plugins/checks/api/ChecksOutputTest.java
index 79170b0d..3677cc07 100644
--- a/src/test/java/io/jenkins/plugins/checks/api/ChecksOutputTest.java
+++ b/src/test/java/io/jenkins/plugins/checks/api/ChecksOutputTest.java
@@ -40,6 +40,12 @@ void shouldBuildCorrectlyWithAllFields() {
         assertThat(checksOutput.getChecksImages())
                 .usingFieldByFieldElementComparator()
                 .containsExactlyInAnyOrderElementsOf(images);
+
+        assertThat(checksOutput).hasToString("ChecksOutput{"
+                + "title='Coverage Report', summary='All code have been covered', text='# Markdown Supported Text'"
+                + ", annotations=" + annotations
+                + ", images=" + images
+                + "}");
     }
 
     @Test