diff --git a/test/struct.test.rb b/test/struct.test.rb
index 7b5a9c4..e06829a 100644
--- a/test/struct.test.rb
+++ b/test/struct.test.rb
@@ -4,6 +4,10 @@ class Person < Literal::Struct
 	prop :name, String
 end
 
+class Student < Person
+	prop :final_grade, Integer
+end
+
 test do
 	person = Person.new(name: "Joel")
 	expect(person.name) == "Joel"
@@ -34,6 +38,13 @@ class Person < Literal::Struct
 	expect(a) != b
 end
 
+test do
+	a = Person.new(name: "Joel")
+	b = Student.new(name: "Joel", final_grade: 90)
+
+	expect(a) != b
+end
+
 # Marshal doesn't work with anonymous classes
 class ::RootStruct < Literal::Struct
 	prop :name, String