Add test to test_close_temp_files using delete=False

tests/test_util.py

@@ -46,8 +46,8 @@ def test_close_temp_files():
     deleted.
 
     '''
+    # With delete=True
     tmpfiles = []
-
     with _close_temp_files(tmpfiles):
         for _ in range(5):
             tmpfiles.append(
@@ -57,6 +57,17 @@ def test_close_temp_files():
         assert tf.file.closed
         assert not os.path.isfile(tf.name)
 
+    # With delete=False
+    tmpfiles = []
+    with _close_temp_files(tmpfiles):
+        for _ in range(5):
+            tmpfiles.append(
+                tempfile.NamedTemporaryFile(suffix='.wav', delete=False))
+
+    for tf in tmpfiles:
+        assert tf.file.closed
+        assert not os.path.isfile(tf.name)
+
 
 def test_set_temp_logging_level():
     '''