pydot: handle multiple dot images in one file

tests/functional_markdown_tests.py

@@ -29,6 +29,17 @@ def test_graphviz_is_rendered():
     assert b'data:image/png;base64' in response.data
 
 
+def test_two_graphviz_are_rendered():
+    """Test two images are rendered."""
+    app = app_with_pydot()
+    client = app.test_client()
+
+    response = client.get('/test-two-graphviz')
+    assert response.status_code == 200
+    assert b'~~~pydot' not in response.data
+    assert b'data:image/png;base64' in response.data
+
+
 def test_invalid_graphviz_is_not_rendered():
     """Check that invalid graphviz doesn't blow things up."""
     app = app_with_pydot()