tests: ensure all figures are closed (#38)

Author: mathause

mplotutils/tests/conftest.py

@@ -0,0 +1,14 @@
+import matplotlib.pyplot as plt
+import pytest
+
+
+@pytest.fixture(scope="function", autouse=True)
+def assert_all_figures_closed():
+    """meta-test to ensure all figures are closed at the end of a test"""
+    yield None
+
+    open_figs = len(plt.get_fignums())
+    if open_figs:
+        raise RuntimeError(
+            f"tests did not close all figures ({open_figs} figures open)"
+        )

mplotutils/tests/test_set_map_layout.py

@@ -1,4 +1,3 @@
-import matplotlib.pyplot as plt
 import numpy as np
 import pytest
 
@@ -79,7 +78,6 @@ def test_vert_borders():
 
     # width:height = 1:1
     with subplots_context() as (f, ax):
-        f, ax = plt.subplots()
         ax.set_aspect("equal")
         ax.set(xlim=(0, 1), ylim=(0, 1))