+ assert_not_predicate user, :valid?, "should not allow nil value"
+ end
+
+ def test_display_name_width
+ user = build(:user)
+ user.display_name = "123"
+ assert_predicate user, :valid?, "should allow 3 column name name"
+ user.display_name = "12"
+ assert_not_predicate user, :valid?, "should not allow 2 column name"
+ user.display_name = "1\u{200B}2"
+ assert_not_predicate user, :valid?, "should not allow 2 column name"
+ user.display_name = "\u{200B}\u{200B}\u{200B}"
+ assert_not_predicate user, :valid?, "should not allow 0 column name"