Add test for attr calls specifically

unittests/function_attributes.chai

@@ -2,7 +2,15 @@
 
 load_module("test_module")
 
-auto t0 = TestBaseType()
+class MyClass
+{
+  var func_member;
+
+  def MyClass() {}
+
+}
+
+auto t0 = MyClass();
 
 t0.func_member = fun(int i){ i * 3; };
 

unittests/function_members.chai

@@ -0,0 +1,13 @@
+// Test attributes/members that are functions
+
+load_module("test_module")
+
+auto t0 = TestBaseType()
+
+t0.func_member = fun(int i){ i * 3; };
+
+assert_true(func_member(t0)(2) == 6)
+assert_true((func_member(t0))(2) == 6)
+assert_true((t0.func_member)(2) == 6)
+assert_true(t0.func_member(2) == 6)
+