diff --git a/src/photools3/metadata_writer.py b/src/photools3/metadata_writer.py
index b5b103e..7c9ce32 100644
--- a/src/photools3/metadata_writer.py
+++ b/src/photools3/metadata_writer.py
@@ -60,15 +60,15 @@ class MetadataWriter:
         force_sidecar: bool = False,
         append: bool = True,
     ):
-        self.path = Path
-        self.force_sidecar = force_sidecar
-        self.append = append
+        self.path: Path = path
+        self.force_sidecar: bool = force_sidecar
+        self.append: bool = append
 
         self._metadata: XmpMetadata | None = None
 
     @property
     def sidecar_path(self) -> Path:
-        return Path()
+        return Path(str(self.path) + ".xmp")
 
     def get_metadata(self, *args, **kwargs) -> Any:
         try:
diff --git a/test/test_metadata_writer.py b/test/test_metadata_writer.py
index 4376840..c397fd5 100644
--- a/test/test_metadata_writer.py
+++ b/test/test_metadata_writer.py
@@ -12,20 +12,56 @@ def make_dng_file(tmp_path):
         src = PATHS_DNG_EXAMPLES[index]
         dst = tmp_path / f"copy_{index}_{src.name}"
         return dst
+
     return _make
 
+
 @pytest.fixture
 def dng_file(make_dng):
     return make_dng()
 
+
 def test_read_metadata(make_dng_file):
     """primitive test for `MetadataWriter`"""
     file_path = make_dng_file()
     result = MetadataWriter(file_path)
     assert result
 
+
 @pytest.mark.parametrize("idx", range(len(PATHS_DNG_EXAMPLES)))
 def test_read_metadata_sidecar_path(make_dng_file, idx):
     file_path = make_dng_file(idx)
     metadata_writer = MetadataWriter(file_path)
+    print(metadata_writer.sidecar_path)
     assert isinstance(metadata_writer.sidecar_path, Path)
+    assert str(metadata_writer.sidecar_path).lower().endswith(".dng.xmp")
+
+
+def test_get_metadata():
+    # TODO: Parametrized test on querying metadata fields
+    ...
+
+
+def test_set_metadata():
+    # TODO: Paramtrized test on setting metadata fields
+    ...
+
+
+def test_set_caption_on_empty():
+    # TODO
+    ...
+
+
+def test_set_caption_on_existing():
+    # TODO
+    ...
+
+
+def test_set_keywords_on_empty():
+    # TODO
+    ...
+
+
+def test_set_keywords_on_existing():
+    # TODO
+    ...