feat: add PageIndex SDK with local/cloud dual-mode support (#207)

tests/test_errors.py

@@ -0,0 +1,27 @@
+from pageindex.errors import (
+    PageIndexError,
+    CollectionNotFoundError,
+    DocumentNotFoundError,
+    IndexingError,
+    CloudAPIError,
+    FileTypeError,
+)
+
+
+def test_all_errors_inherit_from_base():
+    for cls in [CollectionNotFoundError, DocumentNotFoundError, IndexingError, CloudAPIError, FileTypeError]:
+        assert issubclass(cls, PageIndexError)
+        assert issubclass(cls, Exception)
+
+
+def test_error_message():
+    err = FileTypeError("Unsupported: .docx")
+    assert str(err) == "Unsupported: .docx"
+
+
+def test_catch_base_catches_all():
+    for cls in [CollectionNotFoundError, DocumentNotFoundError, IndexingError, CloudAPIError, FileTypeError]:
+        try:
+            raise cls("test")
+        except PageIndexError:
+            pass  # expected