add test

Author: David Hasani

plugins/amazonq/codetransform/jetbrains-community/tst/software/aws/toolkits/jetbrains/services/codemodernizer/CodeWhispererCodeModernizerGumbyClientTest.kt

@@ -136,7 +136,7 @@ class CodeWhispererCodeModernizerGumbyClientTest : CodeWhispererCodeModernizerTe
     }
 
     @Test
-    fun `check startCodeModernization`() {
+    fun `check startCodeModernization on JAVA_17 target`() {
         val actual = gumbyClient.startCodeModernization("jobId", TransformationLanguage.JAVA_8, TransformationLanguage.JAVA_17)
         argumentCaptor<StartTransformationRequest>().apply {
             verify(bearerClient).startTransformation(capture())
@@ -146,6 +146,17 @@ class CodeWhispererCodeModernizerGumbyClientTest : CodeWhispererCodeModernizerTe
         }
     }
 
+    @Test
+    fun `check startCodeModernization on JAVA_21 target`() {
+        val actual = gumbyClient.startCodeModernization("jobId", TransformationLanguage.JAVA_8, TransformationLanguage.JAVA_21)
+        argumentCaptor<StartTransformationRequest>().apply {
+            verify(bearerClient).startTransformation(capture())
+            verifyNoInteractions(streamingBearerClient)
+            assertThat(actual).isInstanceOf(StartTransformationResponse::class.java)
+            assertThat(actual).usingRecursiveComparison().comparingOnlyFields("transformationJobId").isEqualTo(exampleStartCodeMigrationResponse)
+        }
+    }
+
     @Test
     fun `check getCodeModernizationPlan`() {
         val actual = gumbyClient.getCodeModernizationPlan(JobId("JobId"))