TST: add test for find_file utility function

Author: craftablescience

pydm/tests/utilities/test_utilities.py

@@ -5,7 +5,7 @@
 
 from qtpy import QtWidgets
 
-from ...utilities import find_display_in_path, is_pydm_app, is_qt_designer, log_failures, path_info, which
+from ...utilities import find_display_in_path, find_file, is_pydm_app, is_qt_designer, log_failures, path_info, which
 
 logger = logging.getLogger(__name__)
 
@@ -51,6 +51,27 @@ def test_find_display_in_path():
     assert disp_path == expected
 
 
+def test_find_file():
+    parent_lvl1 = tempfile.mkdtemp()
+    parent_lvl2 = tempfile.mkdtemp(dir=parent_lvl1)
+    temp, file_path = tempfile.mkstemp(suffix=".ui", prefix="display_", dir=parent_lvl2)
+    direc, fname, _ = path_info(file_path)
+    # Try to find the file as is... it should not find it.
+    assert find_file(fname) is None
+
+    # Try to find the file under base_path
+    disp_path = find_file(fname, base_path=direc)
+    assert disp_path == file_path
+
+    # Try to find the file under the parent folder without recursion (fail)
+    disp_path = find_file(fname, base_path=parent_lvl1)
+    assert disp_path == None
+
+    # Try to find the file under the parent folder with recursion (succeed)
+    disp_path = find_file(fname, base_path=parent_lvl1, subdir_scan_enabled=True)
+    assert disp_path == file_path
+
+
 def test_which():
     if platform.system() == "Windows":
         out = which("ping")