dify

dify/api/tests/unit_tests/libs/test_file_utils.py

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+from pathlib import Path
+
+import pytest
+
+from libs.file_utils import search_file_upwards
+
+
+def test_search_file_upwards_found_in_parent(tmp_path: Path):
+    base = tmp_path / "a" / "b" / "c"
+    base.mkdir(parents=True)
+
+    target = tmp_path / "a" / "target.txt"
+    target.write_text("ok", encoding="utf-8")
+
+    found = search_file_upwards(base, "target.txt", max_search_parent_depth=5)
+    assert found == target
+
+
+def test_search_file_upwards_found_in_current(tmp_path: Path):
+    base = tmp_path / "x"
+    base.mkdir()
+    target = base / "here.txt"
+    target.write_text("x", encoding="utf-8")
+
+    found = search_file_upwards(base, "here.txt", max_search_parent_depth=1)
+    assert found == target
+
+
+def test_search_file_upwards_not_found_raises(tmp_path: Path):
+    base = tmp_path / "m" / "n"
+    base.mkdir(parents=True)
+    with pytest.raises(ValueError) as exc:
+        search_file_upwards(base, "missing.txt", max_search_parent_depth=3)
+    # error message should contain file name and base path
+    msg = str(exc.value)
+    assert "missing.txt" in msg
+    assert str(base) in msg
+
+
+def test_search_file_upwards_root_breaks_and_raises():
+    # Using filesystem root triggers the 'break' branch (parent == current)
+    with pytest.raises(ValueError):
+        search_file_upwards(Path("/"), "__definitely_not_exists__.txt", max_search_parent_depth=1)
+
+
+def test_search_file_upwards_depth_limit_raises(tmp_path: Path):
+    base = tmp_path / "a" / "b" / "c"
+    base.mkdir(parents=True)
+    target = tmp_path / "a" / "target.txt"
+    target.write_text("ok", encoding="utf-8")
+    # The file is 2 levels up from `c` (in `a`), but search depth is only 2.
+    # The search path is `c` (depth 1) -> `b` (depth 2). The file is in `a` (would need depth 3).
+    # So, this should not find the file and should raise an error.
+    with pytest.raises(ValueError):
+        search_file_upwards(base, "target.txt", max_search_parent_depth=2)