diff --git a/plugin/src/test/java/org/opensearch/ml/model/MLModelManagerTests.java b/plugin/src/test/java/org/opensearch/ml/model/MLModelManagerTests.java
index 525bc95eda..cb807cbf66 100644
--- a/plugin/src/test/java/org/opensearch/ml/model/MLModelManagerTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/model/MLModelManagerTests.java
@@ -49,12 +49,8 @@
 import java.net.URISyntaxException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
-import java.util.Arrays;
-import java.util.Base64;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.security.PrivilegedActionException;
+import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 
@@ -168,6 +164,9 @@ public class MLModelManagerTests extends OpenSearchTestCase {
     @Mock
     private ScriptService scriptService;
 
+    @Mock
+    private MLTask pretrainedMLTask;
+
     @Before
     public void setup() throws URISyntaxException {
         String masterKey = "m+dWmfmnNRiNlOdej/QelEkvMTyH//frS2TBeS2BP4w=";
@@ -373,6 +372,31 @@ public void testRegisterMLModel_DownloadModelFileFailure() {
         verify(modelHelper).downloadAndSplit(eq(modelFormat), eq(modelId), eq(modelName), eq(version), eq(url), any(), any(), any());
     }
 
+    public void testRegisterMLModel_RegisterPreBuildModel() throws PrivilegedActionException {
+        doNothing().when(mlTaskManager).checkLimitAndAddRunningTask(any(), any());
+        when(mlCircuitBreakerService.checkOpenCB()).thenReturn(null);
+        when(threadPool.executor(REGISTER_THREAD_POOL)).thenReturn(taskExecutorService);
+        when(modelHelper.downloadPrebuiltModelMetaList(any(), any())).thenReturn(Collections.singletonList("demo"));
+        when(modelHelper.isModelAllowed(any(), any())).thenReturn(true);
+        MLRegisterModelInput pretrainedInput = mockPretrainedInput();
+        doAnswer(
+                invocation -> {
+                    ActionListener<MLRegisterModelInput> listener = (ActionListener<MLRegisterModelInput>) invocation.getArguments()[2];
+                    listener.onResponse(pretrainedInput);
+                    return null;
+                }
+        ).when(modelHelper).downloadPrebuiltModelConfig(any(), any(), any());
+        MLTask pretrainedTask = MLTask
+                .builder()
+                .taskId("pretrained")
+                .modelId("pretrained")
+                .functionName(FunctionName.TEXT_EMBEDDING)
+                .build();
+        modelManager.registerMLModel(pretrainedInput, pretrainedTask);
+        assertEquals(pretrainedTask.getFunctionName(), FunctionName.SPARSE_ENCODING);
+
+    }
+
     @Ignore
     public void testRegisterMLModel_DownloadModelFile() throws IOException {
         doNothing().when(mlTaskManager).checkLimitAndAddRunningTask(any(), any());
@@ -916,4 +940,16 @@ private MLRegisterModelMetaInput prepareRequest() {
             .build();
         return input;
     }
+
+    private MLRegisterModelInput mockPretrainedInput()
+    {
+        return MLRegisterModelInput
+                .builder()
+                .modelName(modelName)
+                .version(version)
+                .modelGroupId("modelGroupId")
+                .modelFormat(modelFormat)
+                .functionName(FunctionName.SPARSE_ENCODING)
+                .build();
+    }
 }