Add spec for increasing max_complexity at query time

spec/graphql/analysis/max_query_complexity_spec.rb

@@ -50,7 +50,7 @@
     end
   end
 
-  describe "when complexity is overriden at query-level" do
+  describe "when max_complexity is decreased at query-level" do
     before do
       Dummy::Schema.max_complexity = 100
     end
@@ -61,6 +61,17 @@
     end
   end
 
+  describe "when max_complexity is increased at query-level" do
+    before do
+      Dummy::Schema.max_complexity = 1
+    end
+    let(:result) { Dummy::Schema.execute(query_string, max_complexity: 10) }
+
+    it "doesn't error" do
+      assert_equal nil, result["errors"]
+    end
+  end
+
   describe "across a multiplex" do
     before do
       Dummy::Schema.max_complexity = 9