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Plugin to Generate Custom Test Output Format

This example shows how to create a plugin that uses a custom format to write finalized test results to an output stream.

Create Plugin

In a file in your working folder, create a class, ExampleCustomPlugin, that inherits from the matlab.unittest.plugins.TestRunnerPlugin class. In the plugin class:

  • Define a Stream property on the plugin that stores the OutputStream instance. By default, the plugin writes to standard output.

  • Override the default runTestSuite method of TestRunnerPlugin to output text that indicates the test runner is running a new test session. This information is especially useful if you are writing to a single log file, as it allows you to differentiate the test runs.

  • Override the default reportFinalizedResult method of TestRunnerPlugin to write finalized test results to the output stream. You can modify the print method to output the test results in a format that works for your test logs or continuous integration system.

classdef ExampleCustomPlugin < matlab.unittest.plugins.TestRunnerPlugin
    properties (Access=private)
        Stream
    end
    
    methods
        function p = ExampleCustomPlugin(stream)
            if ~nargin
                stream = matlab.unittest.plugins.ToStandardOutput;
            end
            validateattributes(stream,...
                {'matlab.unittest.plugins.OutputStream'},{})
            p.Stream = stream;
        end
    end
    
    methods (Access=protected)
        function runTestSuite(plugin,pluginData)
            plugin.Stream.print('\n--- NEW TEST SESSION at %s ---\n',...
                char(datetime))
            runTestSuite@...
                matlab.unittest.plugins.TestRunnerPlugin(plugin,pluginData);
        end
        
        function reportFinalizedResult(plugin,pluginData)
            thisResult = pluginData.TestResult;
            if thisResult.Passed
                status = 'PASSED';
            elseif thisResult.Failed
                status = 'FAILED';
            elseif thisResult.Incomplete
                status = 'SKIPPED';
            end
            plugin.Stream.print(...
                '### YPS Company - Test %s ### - %s in %f seconds.\n',...
                status,thisResult.Name,thisResult.Duration)
            
            reportFinalizedResult@...
                matlab.unittest.plugins.TestRunnerPlugin(plugin,pluginData)
        end
    end
end

Create Test Class

In your working folder, create the file ExampleTest.m containing the following test class. In this test class, two of the tests pass and the others result in a verification or assumption failure.

classdef ExampleTest < matlab.unittest.TestCase
    methods(Test)
        function testOne(testCase)
            testCase.assertGreaterThan(5,1)
        end
        function testTwo(testCase)
            wrongAnswer = 'wrong';
            testCase.verifyEmpty(wrongAnswer,'Not Empty')
            testCase.verifyClass(wrongAnswer,'double','Not double')
        end
        function testThree(testCase)
            testCase.assumeEqual(7*2,13,'Values not equal')
        end
        function testFour(testCase)
            testCase.verifyEqual(3+2,5);
        end
    end
end

Add Plugin to Test Runner and Run Tests

At the command prompt, create a test suite from the ExampleTest class, and create a test runner.

import matlab.unittest.TestSuite
import matlab.unittest.TestRunner

suite = TestSuite.fromClass(?ExampleTest);
runner = TestRunner.withNoPlugins;

Create an instance of ExampleCustomPlugin and add it to the test runner. Run the tests.

import matlab.unittest.plugins.ToFile
fname = 'YPS_test_results.txt';
p = ExampleCustomPlugin(ToFile(fname));

runner.addPlugin(p)
result = runner.run(suite);

View the contents of the output file.

type(fname)
--- NEW TEST SESSION at 26-Jan-2015 10:41:24 ---
### YPS Company - Test PASSED ### - ExampleTest/testOne in 0.123284 seconds.
### YPS Company - Test FAILED ### - ExampleTest/testTwo in 0.090363 seconds.
### YPS Company - Test SKIPPED ### - ExampleTest/testThree in 0.518044 seconds.
### YPS Company - Test PASSED ### - ExampleTest/testFour in 0.020599 seconds.

Rerun the Incomplete tests using the same test runner. View the contents of the output file.

suiteFiltered = suite([result.Incomplete]);
result2 = runner.run(suiteFiltered);

type(fname)
--- NEW TEST SESSION at 26-Jan-2015 10:41:24 ---
### YPS Company - Test PASSED ### - ExampleTest/testOne in 0.123284 seconds.
### YPS Company - Test FAILED ### - ExampleTest/testTwo in 0.090363 seconds.
### YPS Company - Test SKIPPED ### - ExampleTest/testThree in 0.518044 seconds.
### YPS Company - Test PASSED ### - ExampleTest/testFour in 0.020599 seconds.

--- NEW TEST SESSION at 26-Jan-2015 10:41:58 ---
### YPS Company - Test SKIPPED ### - ExampleTest/testThree in 0.007892 seconds.

See Also

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