split node tests into standalone files

tests/node_tests/test_helpers.py

@@ -0,0 +1,65 @@
+import os
+import tempfile
+from pathlib import Path
+
+import numpy as np
+from PIL import Image
+
+
+def test_list_channels():
+    from backend.nodes.helpers import list_channels, list_folder_paths
+    from backend.nodes.folder import Folder
+
+    ch = list_channels("/nonexistent/file.ibw")
+    assert len(ch) == 1
+    assert ch[0]["name"] == "field"
+
+    ibw_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "demo", "BR_New20012.ibw"))
+    if os.path.exists(ibw_path):
+        ch = list_channels(ibw_path)
+        assert len(ch) == 4
+        names = [c["name"] for c in ch]
+        assert "HeightRetrace" in names
+        assert "AmplitudeRetrace" in names
+        assert all(c["type"] == "DATA_FIELD" for c in ch)
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        img = Image.fromarray(np.zeros((8, 8), dtype=np.uint8))
+        path = os.path.join(tmpdir, "test.png")
+        img.save(path)
+
+        ch = list_channels(path)
+        assert len(ch) == 1
+        assert ch[0]["name"] == "field"
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        path = os.path.join(tmpdir, "test.npy")
+        np.save(path, np.zeros((4, 4)))
+        ch = list_channels(path)
+        assert len(ch) == 1
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        img = Image.fromarray(np.zeros((8, 8), dtype=np.uint8))
+        png_path = os.path.join(tmpdir, "a.png")
+        npy_path = os.path.join(tmpdir, "b.npy")
+        gwy_path = os.path.join(tmpdir, "c.gwy")
+        sxm_path = os.path.join(tmpdir, "d.sxm")
+        ibw_path2 = os.path.join(tmpdir, "e.ibw")
+        txt_path = os.path.join(tmpdir, "notes.txt")
+        img.save(png_path)
+        np.save(npy_path, np.zeros((4, 4)))
+        Path(gwy_path).write_bytes(b"gwy")
+        Path(sxm_path).write_bytes(b"sxm")
+        Path(ibw_path2).write_bytes(b"ibw")
+        with open(txt_path, "w", encoding="utf-8") as fh:
+            fh.write("ignore me")
+
+        paths = list_folder_paths(tmpdir)
+        assert [entry["name"] for entry in paths] == ["directory", "a.png", "b.npy", "c.gwy", "d.sxm", "e.ibw"]
+        assert Path(paths[0]["path"]).resolve() == Path(tmpdir).resolve()
+        assert paths[0]["type"] == "DIRECTORY"
+        assert all(entry["type"] == "FILE_PATH" for entry in paths[1:])
+
+        folder_node = Folder()
+        folder_result = folder_node.list_files(tmpdir)
+        assert folder_result == tuple(entry["path"] for entry in paths)