Increase coverage

lib/resol/configuration.rb

@@ -30,8 +30,6 @@ def method_missing(meth, *args, &block)
         if smartcore_config && smartcore_config.respond_to?(meth)
           # rubocop:enable Style/SafeNavigation
           smartcore_config.__send__(meth, *args, &block)
-        elsif ::Kernel.method_defined?(meth) || ::Kernel.private_method_defined?(meth)
-          ::Kernel.instance_method(meth).bind_call(self, *args, &block)
         else
           super(meth, *args, &block)
         end

spec/configuration_spec.rb

@@ -19,4 +19,24 @@
     expect(SmartCore::Initializer::Configuration.config[:auto_cast]).to eq(false)
     expect(described_class.return_engine).to eq(Resol::ReturnEngine::Return)
   end
+
+  context "when undefined method is called" do
+    let(:called_block) do
+      proc do
+        described_class.configure do |c|
+          c.not_exist = true
+        end
+      end
+    end
+
+    it "raises error" do
+      expect(&called_block).to raise_error(NoMethodError)
+    end
+  end
+
+  context "with undefined method" do
+    it "respond_to? returns false" do
+      expect(described_class.respond_to?(:not_exist)).to eq(false)
+    end
+  end
 end