MATLAB Programming Fundamentals - MathWorks

Write Script-Based Unit Tests

This example shows how to write a script that tests a function that you create. The

example function computes the angles of a right triangle, and you create a script-based

unit test to test the function.

Create rightTri Function to Test

Create this function in a file, rightTri.m, in your current MATLAB® folder. This

function takes lengths of two sides of a triangle as input and returns the three angles of

the corresponding right triangle. The input sides are the two shorter edges of the

triangle, not the hypotenuse.

function angles = rightTri(sides)

A = atand(sides(1)/sides(2));

B = atand(sides(2)/sides(1));

hypotenuse = sides(1)/sind(A);

C = asind(hypotenuse*sind(A)/sides(1));

angles = [A B C];

end

Create Test Script

In your working folder, create a new script, rightTriTest.m. Each unit test checks a

different output of the rightTri function. A test script must adhere to the following

conventions:

• The name of the script file must start or end with the word 'test', which is case-
  insensitive.


• Place each unit test into a separate section of the script file. Each section begins with
  two percent signs (%%), and the text that follows on the same line becomes the name of
  the test element. If no text follows the %%, MATLAB assigns a name to the test. If
  MATLAB encounters a test failure, it still runs remaining tests.


• In a test script, the shared variable section consists of any code that appears before
  the first explicit code section (the first line beginning with %%). Tests share the
  variables that you define in this section. Within a test, you can modify the values of

33 Unit Testing