test: backfill formatting coverage for all selector combinators

Author: flavorjones

lib/syntax_tree/css/format.rb

@@ -111,6 +111,10 @@ def visit_combinator(node)
         case node.value
         when WhitespaceToken
           q.text(" ")
+        when Array
+          q.text(" ")
+          node.value.each { |val| val.format(q) }
+          q.text(" ")
         else
           q.text(" ")
           node.value.format(q)

test/selectors_test.rb

@@ -251,6 +251,13 @@ class SelectorsTest < Minitest::Spec
               ".outer section.foo > table.bar tr",
             )
           end
+
+          it "handles all the combinators" do
+            assert_selector_format(
+              "a b > c + d ~ e || f",
+              "a b > c + d ~ e || f",
+            )
+          end
         end
 
         private