fix(diagrams): Set a dummy filename to prevent raise error when both … (

#240)

* fix(diagrams): Set a dummy filename to prevent raise error when both name and filename are not provided(#203)

* Update __init__.py

Update default name to "diagrams_image"

* Update test_diagram.py

Update unit test to reflect the file name change.

diagrams/__init__.py

@@ -101,8 +101,9 @@ def __init__(
         :param edge_attr: Provide edge_attr dot config attributes.
         """
         self.name = name
-
-        if not filename:
+        if not name and not filename:
+          filename = "diagrams_image"
+        elif not filename:
             filename = "_".join(self.name.split()).lower()
         self.filename = filename
         self.dot = Digraph(self.name, filename=self.filename)

tests/test_diagram.py

@@ -100,6 +100,13 @@ def test_custom_filename(self):
             Node("node1")
         self.assertTrue(os.path.exists(f"{self.name}.png"))
 
+    def test_empty_name(self):
+      """Check that providing an empty name don't crash, but save in a diagrams_image.xxx file."""
+      self.name = 'diagrams_image'
+      with Diagram(show=False):
+          Node("node1")
+      self.assertTrue(os.path.exists(f"{self.name}.png"))
+
 
 class ClusterTest(unittest.TestCase):
     def setUp(self):