Revert "Delete .venv directory"

This reverts commit 5a2693bd9f.

.venv/lib/python3.9/site-packages/matplotlib/tests/test_sankey.py

@@ -0,0 +1,24 @@
+from matplotlib.sankey import Sankey
+
+
+def test_sankey():
+    # lets just create a sankey instance and check the code runs
+    sankey = Sankey()
+    sankey.add()
+
+
+def test_label():
+    s = Sankey(flows=[0.25], labels=['First'], orientations=[-1])
+    assert s.diagrams[0].texts[0].get_text() == 'First\n0.25'
+
+
+def test_format_using_callable():
+    # test using callable by slightly incrementing above label example
+
+    def show_three_decimal_places(value):
+        return f'{value:.3f}'
+
+    s = Sankey(flows=[0.25], labels=['First'], orientations=[-1],
+               format=show_three_decimal_places)
+
+    assert s.diagrams[0].texts[0].get_text() == 'First\n0.250'