test: add tests for py-rattler MatchSpec channel parsing (#870)

py-rattler/tests/unit/test_matchspec.py

@@ -0,0 +1,15 @@
+from rattler import MatchSpec
+
+
+def test_parse_channel_from_canonical_name() -> None:
+    m = MatchSpec("conda-forge::python[version=3.9]")
+    assert m.channel is not None
+    assert m.channel.name == "conda-forge"
+    assert m.channel.base_url == "https://conda.anaconda.org/conda-forge/"
+
+
+def test_parse_channel_from_url() -> None:
+    m = MatchSpec("https://conda.anaconda.org/conda-forge::python[version=3.9]")
+    assert m.channel is not None
+    assert m.channel.name == "conda-forge"
+    assert m.channel.base_url == "https://conda.anaconda.org/conda-forge/"