diff --git a/src/test/java/org/itsallcode/jdbc/resultset/DelegatingResultSetTest.java b/src/test/java/org/itsallcode/jdbc/resultset/DelegatingResultSetTest.java
index ab1b4cf..810df2e 100644
--- a/src/test/java/org/itsallcode/jdbc/resultset/DelegatingResultSetTest.java
+++ b/src/test/java/org/itsallcode/jdbc/resultset/DelegatingResultSetTest.java
@@ -896,19 +896,33 @@ void updateRefLabel() throws SQLException {
     }
 
     @Test
-    void updateBlobIndex() throws SQLException {
+    void updateBlobIndexStream() throws SQLException {
         final InputStream stream = new ByteArrayInputStream(new byte[] { 2 });
         testee().updateBlob(COL_INDEX, stream);
         verify(resultSetMock).updateBlob(eq(COL_INDEX), same(stream));
     }
 
     @Test
-    void updateBlobLabel() throws SQLException {
+    void updateBlobIndexBlob() throws SQLException {
+        final Blob blobMock = mock(Blob.class);
+        testee().updateBlob(COL_INDEX, blobMock);
+        verify(resultSetMock).updateBlob(eq(COL_INDEX), same(blobMock));
+    }
+
+    @Test
+    void updateBlobLabelStream() throws SQLException {
         final InputStream stream = new ByteArrayInputStream(new byte[] { 2 });
         testee().updateBlob(COL_LABEL, stream);
         verify(resultSetMock).updateBlob(eq(COL_LABEL), same(stream));
     }
 
+    @Test
+    void updateBlobLabelBlob() throws SQLException {
+        final Blob blobMock = mock(Blob.class);
+        testee().updateBlob(COL_LABEL, blobMock);
+        verify(resultSetMock).updateBlob(eq(COL_LABEL), same(blobMock));
+    }
+
     @Test
     void updateClobIndex() throws SQLException {
         final Clob clob = mock(Clob.class);