Class-Based Unit Testing

Hi!

I'm using MATLAB 2015b.

I want to create a class-based unit testing for a function like,

function y = multiply (x)

    if x > 5
        y = x * 2;
    else
        y = x * x;
    end
    
end

and my unit test code is like that,

classdef testmultiply < matlab.unittest.TestCase
    
    methods (Test)
        
        function test_if_statement (testCase)
            
            %...
            
        end
    end
end

here, I want to test the if statement for getting code coverage and also finding dead codes.

Actually, I'm able to test the multiply function with below code,

testCase.verifyEqual(y,x*2)

but, I want use an easier and more general way to test more complex functions. How can I do it in MATLAB 2015b?

Also, is there a way to unit test a Simulink Model in MATLAB 2015b without using Simulink Test, Polyspace Code Prover or something else?

Lastly, If anyone can provide me an source about unit test methods, I will be grateful.

Thanks in advance!

Bahadır