diff --git a/alfresco-docker-alfresco-pdf-renderer/src/test/java/org/alfresco/transformer/AlfrescoPdfRendererControllerTest.java b/alfresco-docker-alfresco-pdf-renderer/src/test/java/org/alfresco/transformer/AlfrescoPdfRendererControllerTest.java
index e65aad03..9340cd3b 100644
--- a/alfresco-docker-alfresco-pdf-renderer/src/test/java/org/alfresco/transformer/AlfrescoPdfRendererControllerTest.java
+++ b/alfresco-docker-alfresco-pdf-renderer/src/test/java/org/alfresco/transformer/AlfrescoPdfRendererControllerTest.java
@@ -35,6 +35,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.SpyBean;
+import org.springframework.http.MediaType;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
 
@@ -102,5 +103,7 @@ public class AlfrescoPdfRendererControllerTest extends AbstractTransformerContro
     {
         transformRequest.setSourceExtension("pdf");
         transformRequest.setTargetExtension("png");
+        transformRequest.setSourceMediaType(MediaType.APPLICATION_PDF_VALUE);
+        transformRequest.setTargetMediaType(MediaType.IMAGE_PNG_VALUE);
     }
 }
diff --git a/alfresco-docker-imagemagick/src/test/java/org/alfresco/transformer/ImageMagickControllerTest.java b/alfresco-docker-imagemagick/src/test/java/org/alfresco/transformer/ImageMagickControllerTest.java
index 2b69ff71..71e61fd2 100644
--- a/alfresco-docker-imagemagick/src/test/java/org/alfresco/transformer/ImageMagickControllerTest.java
+++ b/alfresco-docker-imagemagick/src/test/java/org/alfresco/transformer/ImageMagickControllerTest.java
@@ -37,6 +37,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.SpyBean;
+import org.springframework.http.MediaType;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
 
@@ -176,5 +177,7 @@ public class ImageMagickControllerTest extends AbstractTransformerControllerTest
     {
         transformRequest.setSourceExtension("png");
         transformRequest.setTargetExtension("png");
+        transformRequest.setSourceMediaType(MediaType.IMAGE_PNG_VALUE);
+        transformRequest.setTargetMediaType(MediaType.IMAGE_PNG_VALUE);
     }
 }
diff --git a/alfresco-docker-libreoffice/src/test/java/org/alfresco/transformer/LibreOfficeControllerTest.java b/alfresco-docker-libreoffice/src/test/java/org/alfresco/transformer/LibreOfficeControllerTest.java
index 08c67b72..cab9ebea 100644
--- a/alfresco-docker-libreoffice/src/test/java/org/alfresco/transformer/LibreOfficeControllerTest.java
+++ b/alfresco-docker-libreoffice/src/test/java/org/alfresco/transformer/LibreOfficeControllerTest.java
@@ -48,6 +48,7 @@ import org.junit.runner.RunWith;
 import org.mockito.stubbing.Answer;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.SpyBean;
+import org.springframework.http.MediaType;
 import org.springframework.mock.web.MockMultipartFile;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
@@ -133,5 +134,7 @@ public class LibreOfficeControllerTest extends AbstractTransformerControllerTest
     {
         transformRequest.setSourceExtension("doc");
         transformRequest.setTargetExtension("pdf");
+        transformRequest.setSourceMediaType("application/msword");
+        transformRequest.setTargetMediaType(MediaType.IMAGE_PNG_VALUE);
     }
 }
diff --git a/alfresco-docker-tika/src/test/java/org/alfresco/transformer/TikaControllerTest.java b/alfresco-docker-tika/src/test/java/org/alfresco/transformer/TikaControllerTest.java
index 27d0e572..3e37ebb7 100644
--- a/alfresco-docker-tika/src/test/java/org/alfresco/transformer/TikaControllerTest.java
+++ b/alfresco-docker-tika/src/test/java/org/alfresco/transformer/TikaControllerTest.java
@@ -67,6 +67,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.SpyBean;
+import org.springframework.http.MediaType;
 import org.springframework.mock.web.MockMultipartFile;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MvcResult;
@@ -398,6 +399,8 @@ public class TikaControllerTest extends AbstractTransformerControllerTest
     {
         transformRequest.setSourceExtension(sourceExtension);
         transformRequest.setTargetExtension(targetExtension);
+        transformRequest.setSourceMediaType(MediaType.APPLICATION_PDF_VALUE);
+        transformRequest.setTargetMediaType(MediaType.TEXT_PLAIN_VALUE);
         transformRequest.getTransformationRequestOptions().put("transform", "PdfBox");
         transformRequest.getTransformationRequestOptions().put("targetMimetype", "text/plain");
         transformRequest.getTransformationRequestOptions().put("targetEncoding", "UTF-8");
diff --git a/alfresco-transformer-base/src/test/java/org/alfresco/transformer/AbstractTransformerControllerTest.java b/alfresco-transformer-base/src/test/java/org/alfresco/transformer/AbstractTransformerControllerTest.java
index ee67c2ae..bf12a790 100644
--- a/alfresco-transformer-base/src/test/java/org/alfresco/transformer/AbstractTransformerControllerTest.java
+++ b/alfresco-transformer-base/src/test/java/org/alfresco/transformer/AbstractTransformerControllerTest.java
@@ -408,15 +408,10 @@ public abstract class AbstractTransformerControllerTest
         transformRequest.setSchema(1);
         transformRequest.setClientData("Alfresco Digital Business Platform");
         transformRequest.setTransformationRequestOptions(new HashMap<>());
-
         transformRequest.setSourceReference(sourceFileRef);
         transformRequest.setSourceExtension(sourceExtension);
-        // TODO: ATS-53
-        transformRequest.setSourceMediaType("TODO");
         transformRequest.setSourceSize(sourceFile.length());
-
         transformRequest.setTargetExtension(targetExtension);
-        transformRequest.setTargetMediaType("TODO");
 
         // HTTP Request
         HttpHeaders headers = new HttpHeaders();
@@ -447,5 +442,25 @@ public abstract class AbstractTransformerControllerTest
         assertEquals(transformRequest.getSchema(), transformReply.getSchema());
     }
 
+    @Test
+    public void testEmptyPojoTransform() throws Exception
+    {
+        // Transformation Request POJO
+        TransformRequest transformRequest = new TransformRequest();
+
+        // Serialize and call the transformer
+        String tr = objectMapper.writeValueAsString(transformRequest);
+        String transformationReplyAsString = mockMvc.perform(MockMvcRequestBuilders.post("/transform")
+            .header(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
+            .header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE).content(tr))
+            .andExpect(status().is(HttpStatus.BAD_REQUEST.value()))
+            .andReturn().getResponse().getContentAsString();
+
+        TransformReply transformReply = objectMapper.readValue(transformationReplyAsString, TransformReply.class);
+
+        // Assert the reply
+        assertEquals(HttpStatus.BAD_REQUEST.value(), transformReply.getStatus());
+    }
+
     protected abstract void updateTransformRequestWithSpecificOptions(TransformRequest transformRequest);
 }