Disable hash comparison on Windows and macOS

Author: domdfcoding

tests/test_plot.py

@@ -24,14 +24,15 @@
 baseline_dir = str(PathPlus(__file__).parent / "baseline")
 assert os.path.exists(baseline_dir)
 
-if sys.version_info[:2] == (3, 7):
-	image_hashes = str(PathPlus(__file__).parent / "image_hashes_37.json")
-elif sys.version_info[:2] == (3, 8):
-	image_hashes = str(PathPlus(__file__).parent / "image_hashes_38.json")
-elif sys.version_info[:2] == (3, 9):
-	image_hashes = str(PathPlus(__file__).parent / "image_hashes_39.json")
-else:
-	image_hashes = str(PathPlus(__file__).parent / "image_hashes.json")
+if platform.system == "Linux":
+	if sys.version_info[:2] == (3, 7):
+		image_hashes = str(PathPlus(__file__).parent / "image_hashes_37.json")
+	elif sys.version_info[:2] == (3, 8):
+		image_hashes = str(PathPlus(__file__).parent / "image_hashes_38.json")
+	elif sys.version_info[:2] == (3, 9):
+		image_hashes = str(PathPlus(__file__).parent / "image_hashes_39.json")
+	else:
+		image_hashes = str(PathPlus(__file__).parent / "image_hashes.json")
 
 check_images = pytest.mark.mpl_image_compare(
 		baseline_dir=baseline_dir,