feat: Improve undefined method msg for style builder (#6)

lib/phlex/variants.rb

@@ -82,6 +82,11 @@ def variants(&)
       def defaults(**variants)
         view_class::STYLE_DEFAULTS.merge!(variants)
       end
+
+      def method_missing(method, *args, &) # standard:disable Style/MissingRespondToMissing
+        message = "undefined method '#{method}' for an instance of Phlex::Variants::StyleBuilder. The available methods are: 'base', 'variants' and 'defaults'"
+        raise NoMethodError, message
+      end
     end
 
     # @api private

spec/phlex/variants_spec.rb

@@ -245,6 +245,20 @@ def view_template
     expect(actual_classes).to eq expected_classes
   end
 
+  it "explains propery when calling undefined method from StyleBuilder" do
+    msg = "undefined method 'color' for an instance of Phlex::Variants::StyleBuilder. The available methods are: 'base', 'variants' and 'defaults'"
+
+    expect do
+      phlex_class do
+        style do
+          color do
+            red "bg-red-200 hover:bg-red-400"
+          end
+        end
+      end
+    end.to raise_error(NoMethodError, msg)
+  end
+
   def phlex_class(&)
     Class.new(Phlex::HTML) do
       include Phlex::Variants