throw a EntryAlreadyExistsStoreException if a blob with the given id already exists

scm-test/src/main/java/sonia/scm/store/BlobStoreTestBase.java

@@ -122,6 +122,17 @@ public abstract class BlobStoreTestBase extends AbstractTestBase
     assertEquals("Other Text", read(blob));
   }
 
+  /**
+   * Method description
+   *
+   */
+  @Test(expected = EntryAlreadyExistsStoreException.class)
+  public void testCreateAlreadyExistingEntry()
+  {
+    assertNotNull(store.create("1"));
+    store.create("1");
+  }
+
   /**
    * Method description
    *