Fix validation error when replacing names of a GenomicRangesList (#123

)

Also add tests

src/genomicranges/GenomicRangesList.py

@@ -426,7 +426,7 @@ def set_names(
             or as a reference to the (in-place-modified) original.
         """
         if names is not None:
-            _validate_optional_attrs(None, names, len(self))
+            _validate_optional_attrs(self.get_mcols(), names, len(self))
 
             if not isinstance(names, ut.Names):
                 names = ut.Names(names)

tests/test_grl_initialize.py

@@ -42,3 +42,13 @@ def test_create_grl_should_fail():
 def test_empty_grl():
     grl = GenomicRangesList.empty(n=100)
     assert isinstance(grl, GenomicRangesList)
+
+
+def test_grl_set_names():
+    grl = GenomicRangesList(ranges=[a, b], names=["a", "b"])
+
+    grl_replace_names = grl.set_names(["aa", "bb"])
+
+    assert grl_replace_names is not None
+    assert isinstance(grl_replace_names, GenomicRangesList)
+    assert list(grl.get_names()) == ["a", "b"]