TST: Ensure new test is not affected by other tests in the test suite

pydm/tests/test_main_window.py

@@ -1,6 +1,7 @@
 import os
 
-from pydm import Display, PyDMApplication
+from pydm import PyDMApplication
+from pydm.display import Display, clear_compiled_ui_file_cache
 from qtpy import uic
 from unittest.mock import MagicMock, patch
 
@@ -11,14 +12,19 @@
 @patch("qtpy.uic.compileUi", wraps=uic.compileUi)
 def test_reload_display(wrapped_compile_ui: MagicMock, qapp: PyDMApplication) -> None:
     """Verify that when a user reloads a PyDM window the underling display's ui file is actually reloaded"""
-    display = Display(parent=None, ui_filename=test_ui_path)
+    clear_compiled_ui_file_cache()  # Ensure other tests have not already compiled our test file before we start
 
-    qapp.make_main_window()
-    qapp.main_window.set_display_widget(display)
+    try:
+        display = Display(parent=None, ui_filename=test_ui_path)
 
-    # When the display is first created and loaded the underlying ui file gets compiled
-    wrapped_compile_ui.assert_called_once()
+        qapp.make_main_window()
+        qapp.main_window.set_display_widget(display)
 
-    # Reloading should force a re-compile of the ui file to ensure any changes are picked up
-    qapp.main_window.reload_display(True)
-    assert wrapped_compile_ui.call_count == 2
+        # When the display is first created and loaded the underlying ui file gets compiled
+        wrapped_compile_ui.assert_called_once()
+
+        # Reloading should force a re-compile of the ui file to ensure any changes are picked up
+        qapp.main_window.reload_display(True)
+        assert wrapped_compile_ui.call_count == 2
+    finally:
+        clear_compiled_ui_file_cache()