diff --git a/modules/openapi-generator-gradle-plugin/src/test/kotlin/GenerateTaskDslTest.kt b/modules/openapi-generator-gradle-plugin/src/test/kotlin/GenerateTaskDslTest.kt
index 30a725f70e0..247a57c0390 100644
--- a/modules/openapi-generator-gradle-plugin/src/test/kotlin/GenerateTaskDslTest.kt
+++ b/modules/openapi-generator-gradle-plugin/src/test/kotlin/GenerateTaskDslTest.kt
@@ -401,7 +401,7 @@ class GenerateTaskDslTest : TestBase() {
     fun `openApiValidate should fail on invalid spec`() {
         // Arrange
         val projectFiles = mapOf(
-                "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid.yaml")
+                "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid-due-to-missing-info-attribute.yaml")
         )
 
         withProject(defaultBuildGradle, projectFiles)
@@ -423,7 +423,7 @@ class GenerateTaskDslTest : TestBase() {
     fun `openApiValidate should ok skip spec validation`() {
         // Arrange
         val projectFiles = mapOf(
-                "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid.yaml")
+                "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid-due-to-missing-info-attribute.yaml")
         )
 
         withProject("""
diff --git a/modules/openapi-generator-gradle-plugin/src/test/kotlin/ValidateTaskDslTest.kt b/modules/openapi-generator-gradle-plugin/src/test/kotlin/ValidateTaskDslTest.kt
index ff05a5784ca..aa80ed587f8 100644
--- a/modules/openapi-generator-gradle-plugin/src/test/kotlin/ValidateTaskDslTest.kt
+++ b/modules/openapi-generator-gradle-plugin/src/test/kotlin/ValidateTaskDslTest.kt
@@ -113,7 +113,7 @@ class ValidateTaskDslTest : TestBase() {
     fun `openApiValidate should fail on invalid spec`(gradleVersion: String?) {
         // Arrange
         val projectFiles = mapOf(
-            "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid.yaml")
+            "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid-due-to-missing-info-attribute.yaml")
         )
         withProject(
             """
@@ -139,6 +139,50 @@ class ValidateTaskDslTest : TestBase() {
             result.output.contains("Spec is invalid."),
             "Unexpected/no message presented to the user for an invalid spec."
         )
+        assertTrue(
+            result.output.contains("attribute info is missing"),
+            "Spec validation detail"
+        )
+        assertEquals(
+            FAILED, result.task(":openApiValidate")?.outcome,
+            "Expected a failed run, but found ${result.task(":openApiValidate")?.outcome}"
+        )
+    }
+
+    @Test(dataProvider = "gradle_version_provider")
+    fun `openApiValidate should fail on invalid spec with duplicate 200 status code`(gradleVersion: String?) {
+        // Arrange
+        val projectFiles = mapOf(
+            "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid-due-to-duplicate-200-status-code.yaml")
+        )
+        withProject(
+            """
+            | plugins {
+            |   id 'org.openapi.generator'
+            | }
+            |
+            | openApiValidate {
+            |   inputSpec = file('spec.yaml').absolutePath
+            | }
+        """.trimMargin(), projectFiles
+        )
+
+        // Act
+        val result = getGradleRunner(gradleVersion)
+            .withProjectDir(temp)
+            .withArguments("openApiValidate")
+            .withPluginClasspath()
+            .buildAndFail()
+
+        // Assert
+        assertTrue(
+            result.output.contains("Spec is invalid."),
+            "Unexpected/no message presented to the user for an invalid spec."
+        )
+        assertTrue(
+            result.output.contains("Duplicate field 200"),
+            "Spec validation detail"
+        )
         assertEquals(
             FAILED, result.task(":openApiValidate")?.outcome,
             "Expected a failed run, but found ${result.task(":openApiValidate")?.outcome}"
@@ -186,7 +230,7 @@ class ValidateTaskDslTest : TestBase() {
     fun `validateBadSpec as defined task should fail on invalid spec`(gradleVersion: String?) {
         // Arrange
         val projectFiles = mapOf(
-            "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid.yaml")
+            "spec.yaml" to javaClass.classLoader.getResourceAsStream("specs/petstore-v3.0-invalid-due-to-missing-info-attribute.yaml")
         )
         withProject(
             """
@@ -212,6 +256,10 @@ class ValidateTaskDslTest : TestBase() {
             result.output.contains("Spec is invalid."),
             "Unexpected/no message presented to the user for an invalid spec."
         )
+        assertTrue(
+            result.output.contains("attribute info is missing"),
+            "Unexpected/no message presented to the user for an invalid spec."
+        )
         assertEquals(
             FAILED, result.task(":validateBadSpec")?.outcome,
             "Expected a failed run, but found ${result.task(":validateBadSpec")?.outcome}"
diff --git a/modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid-due-to-duplicate-200-status-code.yaml b/modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid-due-to-duplicate-200-status-code.yaml
new file mode 100644
index 00000000000..2943eea98f5
--- /dev/null
+++ b/modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid-due-to-duplicate-200-status-code.yaml
@@ -0,0 +1,111 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+servers:
+  - url: http://petstore.swagger.io/v1
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: listPets
+      tags:
+        - pets
+      parameters:
+        - name: limit
+          in: query
+          description: How many items to return at one time (max 100)
+          required: false
+          schema:
+            type: integer
+            format: int32
+      responses:
+        '200':
+          description: A paged array of pets
+          headers:
+            x-next:
+              description: A link to the next page of responses
+              schema:
+                type: string
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pets"
+        '200':
+          description: duplicate 200
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+    post:
+      summary: Create a pet
+      operationId: createPets
+      tags:
+        - pets
+      responses:
+        '201':
+          description: Null response
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+  /pets/{petId}:
+    get:
+      summary: Info for a specific pet
+      operationId: showPetById
+      tags:
+        - pets
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          description: The id of the pet to retrieve
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pets"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+components:
+  schemas:
+    Pet:
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+        tag:
+          type: string
+    Pets:
+      type: array
+      items:
+        $ref: "#/components/schemas/Pet"
+    Error:
+      required:
+        - code
+        - message
+      properties:
+        code:
+          type: integer
+          format: int32
+        message:
+          type: string
diff --git a/modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid.yaml b/modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid-due-to-missing-info-attribute.yaml
similarity index 100%
rename from modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid.yaml
rename to modules/openapi-generator-gradle-plugin/src/test/resources/specs/petstore-v3.0-invalid-due-to-missing-info-attribute.yaml