Fix backend tests on Windows (#6781)

* hotfix

* testing

* test

* fix

* fix

* add changeset

* add changeset

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

Author: abidlabs

.changeset/vast-kings-deny.md

@@ -0,0 +1,5 @@
+---
+"gradio": patch
+---
+
+feat:Fix backend tests on Windows

gradio/components/file_explorer.py

@@ -170,7 +170,7 @@ def expand_braces(text, seen=None):
         def make_tree(files):
             tree = []
             for file in files:
-                parts = file.split("/")
+                parts = file.split(os.path.sep)
                 make_node(parts, tree)
             return tree
 

test/test_components.py

@@ -2138,16 +2138,18 @@ def test_gallery(self):
 
         postprocessed_gallery = gallery.postprocess(
             [
-                ("test/test_files/foo.png", "foo_caption"),
+                (str(Path("test/test_files/foo.png")), "foo_caption"),
                 (Path("test/test_files/bar.png"), "bar_caption"),
-                "test/test_files/baz.png",
+                str(Path("test/test_files/baz.png")),
                 Path("test/test_files/qux.png"),
             ]
         ).model_dump()
+
+        # Using str(Path(...)) to ensure that the test passes on all platforms
         assert postprocessed_gallery == [
             {
                 "image": {
-                    "path": "test/test_files/foo.png",
+                    "path": str(Path("test") / "test_files" / "foo.png"),
                     "orig_name": "foo.png",
                     "mime_type": None,
                     "size": None,
@@ -2157,7 +2159,7 @@ def test_gallery(self):
             },
             {
                 "image": {
-                    "path": "test/test_files/bar.png",
+                    "path": str(Path("test") / "test_files" / "bar.png"),
                     "orig_name": "bar.png",
                     "mime_type": None,
                     "size": None,
@@ -2167,7 +2169,7 @@ def test_gallery(self):
             },
             {
                 "image": {
-                    "path": "test/test_files/baz.png",
+                    "path": str(Path("test") / "test_files" / "baz.png"),
                     "orig_name": "baz.png",
                     "mime_type": None,
                     "size": None,
@@ -2177,7 +2179,7 @@ def test_gallery(self):
             },
             {
                 "image": {
-                    "path": "test/test_files/qux.png",
+                    "path": str(Path("test") / "test_files" / "qux.png"),
                     "orig_name": "qux.png",
                     "mime_type": None,
                     "size": None,