MATLAB Programming Fundamentals - MathWorks

Write Simple Test Case Using Functions

This example shows how to write a unit test for a MATLAB function,

quadraticSolver.m.

Create quadraticSolver.m Function

This MATLAB function solves quadratic equations. Create this function in a folder on your

MATLAB path.

function roots = quadraticSolver(a, b, c)

% quadraticSolver returns solutions to the

% quadratic equation a*x^2 + b*x + c = 0.

if ~isa(a,'numeric') || ~isa(b,'numeric') || ~isa(c,'numeric')

error('quadraticSolver:InputMustBeNumeric', ...

'Coefficients must be numeric.');

end

roots(1) = (-b + sqrt(b^2 - 4*a*c)) / (2*a);

roots(2) = (-b - sqrt(b^2 - 4*a*c)) / (2*a);

end

Create solverTest Function

Create this function in a folder on your MATLAB path.

function tests = solverTest

tests = functiontests(localfunctions);

end

A call to functiontests using localfunctions as input creates an array of tests from

each local function in the solverTest.m file. Each test is a local function that follows the

naming convention of having ’test’ at the beginning or end of the function name. Local

functions that do not follow this convention are not included in the test array. Test

functions must accept a single input argument into which the test framework passes a

function test case object. The function uses this object for verifications, assertions,

assumptions, and fatal assertions. It contains a TestData structure that allows data to be

passed between setup, test, and teardown functions.

33 Unit Testing