I am manual testing a form and there is a field name "Project description" And it is not a mandatory field. User will describe their description of project in that field.Now I am giving input and testing that field.

The Condition is that the field accepts a-z, A-Z, 0-9, and all the special characters.

So my question is that now if I only enter special character in that field or only digit in that field will this be considered as negative test case? And the test won't pass?

Or the test will pass as it accepts the digits and special character in the previous condition?