Skip filename checking on Windows.

spec/metadata_spec.rb

@@ -753,7 +753,9 @@
       context filename do
         subject {RDF::Tabular::Metadata.open(filename, logger: logger)}
         it {is_expected.to be_valid}
-        its(:filenames) {is_expected.to include("file:/#{filename.sub(/^\//, '')}")}
+        its(:filenames, skip: ('not windows' if Gem.win_platform?)) do
+          is_expected.to include("file:/#{filename.sub(/^\//, '')}")
+        end
       end
       after(:each) do
         expect(logger.to_s).not_to match(/ERROR|WARN/)
@@ -818,8 +820,8 @@
             subject.validate
             expect(logger.to_s).to be_empty
           end
-          it "has expected filenames" do
-            expect(Array(subject.filenames).map(&:to_s)).to include("file:/#{filename.sub(/^\//, '')}")
+          its(:filenames, skip: ('not windows' if Gem.win_platform?)) do
+            is_expected.to include("file:/#{filename.sub(/^\//, '')}")
           end
         end
       end