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matlab.unittest.plugins.codecoverage.CoverageReport class

Package: matlab.unittest.plugins.codecoverage

Format for HTML code coverage report

Since R2019a


The matlab.unittest.plugins.codecoverage.CoverageReport class provides a way to generate code coverage reports in HTML format. To generate a code coverage report in this format, create a CodeCoveragePlugin instance using a CoverageReport object, and then add the plugin to the test runner.



format = matlab.unittest.plugins.codecoverage.CoverageReport creates a CoverageReport object that instructs CodeCoveragePlugin to generate a report in HTML format and save it to a temporary folder. By default, the main file of the report is index.html.


format = matlab.unittest.plugins.codecoverage.CoverageReport(folderName) specifies the name of the code coverage report folder.

format = matlab.unittest.plugins.codecoverage.CoverageReport(___,"MainFile",filename) sets the MainFile property to the specified name. You can specify the filename as the last argument in any of the previous syntaxes. For example, format = matlab.unittest.plugins.codecoverage.CoverageReport("MainFile","main.html") creates a CoverageReport object with its MainFile property set to 'main.html'.

Input Arguments

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Name of the code coverage report folder, specified as a string scalar or character vector. The value can be a relative path, but the relative path must be in the current folder. Otherwise, the value must be a full path. If the folder does not exist, CoverageReport creates it.

Example: "myCoverageReport"

Example: "C:\work\myCoverageReport"


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Name of the main HTML file, returned as a character vector ending in .html or .htm. If not set, the main file of the report is index.html.

Example: 'main.html'




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Run a suite of tests and generate a code coverage report in HTML format for your source code.

In a folder named sourceFolder in your current folder, create the quadraticSolver function. The function takes as inputs the coefficients of a quadratic polynomial and returns the roots of that polynomial. If the coefficients are specified as nonnumeric values, the function throws an error.

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.")

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


To test the quadraticSolver function, create the SolverTest class in a folder named testsFolder in your current folder. Define three Test methods that test the function against real solutions, imaginary solutions, and nonnumeric inputs.

classdef SolverTest < matlab.unittest.TestCase
        function realSolution(testCase)
            actSolution = quadraticSolver(1,-3,2);
            expSolution = [2 1];
        function imaginarySolution(testCase)
            actSolution = quadraticSolver(1,2,10);
            expSolution = [-1+3i -1-3i];
        function nonnumericInput(testCase)
            testCase.verifyError(@()quadraticSolver(1,"-3",2), ...

To run the tests and generate a code coverage report, first add sourceFolder to the path.


Create a test suite from testsFolder.

suite = testsuite("testsFolder");

Create a test runner and customize it using a plugin that generates an HTML code coverage report for the code in sourceFolder. Specify that the plugin writes its output to a folder named coverageReport in your current folder.

import matlab.unittest.plugins.CodeCoveragePlugin
import matlab.unittest.plugins.codecoverage.CoverageReport
runner = testrunner("textoutput");
sourceCodeFolder = "sourceFolder";
reportFolder = "coverageReport";
reportFormat = CoverageReport(reportFolder);
p = CodeCoveragePlugin.forFolder(sourceCodeFolder,"Producing",reportFormat);

Run the tests. In this example, all the tests pass and the source code receives full coverage. The plugin generates an HTML code coverage report in the specified folder coverageReport, created in your current folder. By default, the main file of the report is index.html.

results =;
Running SolverTest
Done SolverTest

MATLAB code coverage report has been saved to:

Open the main file of the report.


Version History

Introduced in R2019a

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