diff --git a/src/test/kotlin/com/vonage/client/kt/AbstractTest.kt b/src/test/kotlin/com/vonage/client/kt/AbstractTest.kt
index dbba710..9a8bff6 100644
--- a/src/test/kotlin/com/vonage/client/kt/AbstractTest.kt
+++ b/src/test/kotlin/com/vonage/client/kt/AbstractTest.kt
@@ -126,7 +126,7 @@ abstract class AbstractTest {
 
             if (expectedBody != null) {
                 body = ObjectMapper().writeValueAsString(expectedBody)
-                header = "Content-Type" to "application/json"
+                header = "Content-Type" to ContentType.APPLICATION_JSON.mime
             }
         }
 
diff --git a/src/test/kotlin/com/vonage/client/kt/VerifyTest.kt b/src/test/kotlin/com/vonage/client/kt/VerifyTest.kt
index cc9fdea..0d8ce8b 100644
--- a/src/test/kotlin/com/vonage/client/kt/VerifyTest.kt
+++ b/src/test/kotlin/com/vonage/client/kt/VerifyTest.kt
@@ -105,4 +105,13 @@ class VerifyTest : AbstractTest() {
         mockJsonJwtPost("$baseUrl/$requestId/next-workflow")
         verifyClient.nextWorkflow(requestId)
     }
+
+    @Test
+    fun `check code`() {
+        val code = "1228864"
+        mockJsonJwtPost("$baseUrl/$requestId",
+             expectedRequestParams = mapOf("code" to code)
+        )
+        verifyClient.checkVerificationCode(requestId, code)
+    }
 }
\ No newline at end of file