diff --git a/lib/galaxy/datatypes/binary.py b/lib/galaxy/datatypes/binary.py
index 3bd00f025ec..bad76cdfd15 100644
--- a/lib/galaxy/datatypes/binary.py
+++ b/lib/galaxy/datatypes/binary.py
@@ -1441,7 +1441,7 @@ class DMND( Binary ):
     """
     Class describing an DMND file
     >>> from galaxy.datatypes.sniff import get_test_fname
-    >>> fname = get_test_fname( 'test.dmnd' )
+    >>> fname = get_test_fname( 'diamond_db.dmnd' )
     >>> DMND().sniff( fname )
     True
     >>> fname = get_test_fname( 'interval.interval' )
diff --git a/lib/galaxy/datatypes/sniff.py b/lib/galaxy/datatypes/sniff.py
index 23f18b8f192..7188bafdba5 100644
--- a/lib/galaxy/datatypes/sniff.py
+++ b/lib/galaxy/datatypes/sniff.py
@@ -356,7 +356,7 @@ def guess_ext( fname, sniff_order, is_multi_byte=False ):
     >>> fname = get_test_fname('1.gg')
     >>> guess_ext(fname, sniff_order)
     'gg'
-    >>> fname = get_test_fname('test.dmnd')
+    >>> fname = get_test_fname('diamond_db.dmnd')
     >>> guess_ext(fname, sniff_order)
     'dmnd'
     """
diff --git a/lib/galaxy/datatypes/test/diamond_db.dmnd b/lib/galaxy/datatypes/test/diamond_db.dmnd
new file mode 100644
index 00000000000..b5322de5617
Binary files /dev/null and b/lib/galaxy/datatypes/test/diamond_db.dmnd differ