Error with MATLAB Programming Techniques 'Writing Test Function'

Hello,

I don´t know how to continue in section 7.5 Writing Test Function. I just copy the answer proposed in the help but it doesn´t work. Can someone help me?

Thank you so much.

[DGM]

How exactly does it not work? Is there an error? If so, what is the message?

[Pablo Horrillo Quintero]

Hola,

Muchas gracias por responder. . El código de error es Test Results:

Incorrect!

Were three tests run? OK

Did all tests pass? OK

Is the file a function? WRONG

En primer lugar, este es el codigo de run_squareRootTest y en squareRootTest, respectivamente

function test = squareRootTest
test = functiontests(localfunctions);
end

Positive roots are real

function posRootTest(testcase)
x = linspace(0,pi);
y = sqrt(x);
assert(isreal(y))
end

Negative roots are complex

function negRootTest(testcase)
z = linspace(-pi,pi);
y = sqrt(z);
assert(~isreal(y))
end

sqrt(x) is smaller than x (if x > 1)

function sqrtTest(testcase)
x = linspace(0,pi);
y = x + 2;
z = sqrt(y);
assert(all(y > z))
end

[DGM]

I don't have access to these courses, but I wonder if it's just as simple as:

function test = squareRootTest()

Either way should work, as you've discovered, but there may be differences with how the tool is actually trying to verify that the function definition is valid. That's just a wild guess.

This might be something you have to take up with support. I haven't taken any of these courses, but there should be some sort of support for them.

Answer 1

[SAI SRUJAN]

Hi Pablo,

I understand that you are facing an issue with writing test functions.

In MATLAB, a test file typically contains test functions that are written to validate the code you've written. You can write a test file using test functions with the MATLAB Unit Testing Framework.

Follow the given code snippet to proceed further,

function test = squareRootTest()
test = functiontests(localfunctions);
end

function posRootTest(testcase)
x = linspace(0,pi);
y = sqrt(x);
assert(isreal(y))
end

function negRootTest(testcase)
z = linspace(-pi,pi);
y = sqrt(z);
assert(~isreal(y))
end

function sqrtTest(testcase)
x = linspace(0,pi);
y = x + 2;
z = sqrt(y);
assert(all(y > z))
end

The 'squareRootTest' function generates a suite of test cases for a square root function using 'functiontests', which creates an array of tests from the local functions within the file. This array can be run by MATLAB's testing framework to validate the square root function.

To run the test, call the 'runtests' function with the name of the test file (without the .m extension), like this:

result = runtests("squareRootTest");

I hope this helps.