try fix suggested by Eric

#1250

Makefile

@@ -24,7 +24,7 @@ clean-e:
 clean: clean-build clean-pyc clean-so clean-ctags clean-cache clean-e
 
 inplace:
-	@python -m pip install -e .[dev]
+	@python -m pip install -e ".[dev]"
 
 test:
 	@echo "Running tests"

mne_bids/conftest.py

@@ -17,3 +17,13 @@ def monkeypatch_mne():
         "mne",
         "mne_bids",
     )
+
+
+@pytest.fixture(autouse=True)
+def close_all():
+    """Close all matplotlib plots, regardless of test status."""
+    # This adds < 1 µS in local testing, and we have ~2500 tests, so ~2 ms max
+    import matplotlib.pyplot as plt
+
+    yield
+    plt.close("all")