print

Class: matlab.unittest.plugins.OutputStream
Package: matlab.unittest.plugins

Print text to output stream

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Syntax

print(stream,formatSpec,A1,...,An)

Description

print(stream,formatSpec,A1,...,An) formats the data in arrays A1,...,An according to formatSpec, and sends the result to the output stream, stream. Assign formatSpec and A1,...,An using the same interface that you use for sprintf and fprintf.

Input Arguments

stream

Output stream, specified as an instance of the OutputStream class

formatSpec

Format of text in output stream, specified as a character vector. For information on the construction of formatSpec, see the input argument entry on the fprintf or sprint reference pages.

A

Numeric or character arrays, specified as a scalar, vector, matrix, or multidimensional array.

Examples

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In a file in your working directory, create a new output stream class in the file ToFigure.m. This class allows plugin output to be redirected to a figure.

classdef ToFigure < matlab.unittest.plugins.OutputStream
    
    properties(SetAccess=private)
        Figure
    end
    properties(Access=private)
        ListBox
    end

This class uses two properties. Figure is the figure that receives and displays the output. ListBox is a handle to the list box that displays the text.

In the same file, add the following methods block.

    methods
        function print(stream,formatSpec,varargin)
            % Create the figure
            if isempty(stream.Figure) || ~ishghandle(stream.Figure)
                stream.createFigure
            end
            newStr = sprintf(formatSpec,varargin{:});
            oldStr = strjoin(stream.ListBox.String', '\n');
            
            % Create the full message
            fullStr = [oldStr,newStr];
            fullStrCell = strsplit(fullStr,'\n','CollapseDelimiters',false);
            
            % Set the string and selection
            stream.ListBox.String = fullStrCell';
            stream.ListBox.Value = numel(fullStrCell);
            drawnow
        end
    end

You must implement the print method for any subclass of OutputStream. In this example, the method creates a new figure (if necessary), formats the incoming text, and then adds it to the output stream.

In the same file, add the following methods block containing a helper function to create the figure.

    methods(Access=private)
        function createFigure(stream)
            stream.Figure = figure(...
                'Name',         'Unit Test Output', ...
                'WindowStyle',  'docked');
            
            stream.ListBox = uicontrol( ...
                'Parent',       stream.Figure, ...
                'Style',        'listbox', ...
                'String',       {}, ...
                'Units',        'normalized', ...
                'Position',     [.05 .05 .9 .9], ...
                'Max',          2, ...
                'FontName',     'Monospaced', ...
                'FontSize',      13);
        end
    end
end

In an new file in your working folder, create ExampleTest.m containing the following test class.

classdef ExampleTest < matlab.unittest.TestCase
    methods(Test)
        function testOne(testCase)  % Test fails
            testCase.verifyEqual(5, 4, 'Testing 5==4' );
        end
        function testTwo(testCase)  % Test passes
            testCase.verifyEqual(5, 5, 'Testing 5==5' );
        end
        function testThree(testCase)
            % test code
        end
    end
end

The verifyEqual qualification in testOne causes a test failure. The qualifications in testOne and testTwo include an instance of a matlab.unittest.diagnostics.StringDiagnostic.

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

import matlab.unittest.TestSuite
import matlab.unittest.TestRunner
import matlab.unittest.plugins.DiagnosticsValidationPlugin

suite = TestSuite.fromClass(?ExampleTest);

Create a test runner that displays output to the command window.

runner = TestRunner.withTextOutput;

Create a DiagnosticsValidationPlugin that explicitly specifies that its output should go to a figure via the ToFigure output stream.

plugin = DiagnosticsValidationPlugin(ToFigure);

Add the plugin to the TestRunner and run the suite. 

runner.addPlugin(plugin)
result = runner.run(suite);
Running ExampleTest

================================================================================
Verification failed in ExampleTest/testOne.

    ----------------
    Test Diagnostic:
    ----------------
    Testing 5==4

    ---------------------
    Framework Diagnostic:
    ---------------------
    verifyEqual failed.
    --> The values are not equal using "isequaln".
    --> Failure table:
                Actual    Expected    Error    RelativeError
                ______    ________    _____    _____________
            
                5         4           1        0.25         
    
    Actual double:
             5
    Expected double:
             4

    ------------------
    Stack Information:
    ------------------
    In C:\work\ExampleTest.m (ExampleTest.testOne) at 4
================================================================================
...
Done ExampleTest
__________

Failure Summary:

     Name                 Failed  Incomplete  Reason(s)
    ==================================================================
     ExampleTest/testOne    X                 Failed by verification.

Only the test failures produce output to the screen. By default, TestRunner.withTextOutput uses a FailureDiagnosticsPlugin to display output on the screen.

In addition to the default text output being displayed on the screen, the DiagnosticsValidationPlugin output is directed to a docked figure. The figure shows the following text.

------------------------------
Validation of Test Diagnostic:
------------------------------
Testing 5==4
------------------------------
Validation of Test Diagnostic:
------------------------------
Testing 5==5

The DiagnosticsValidationPlugin displays the diagnostic information regardless of whether the tests encounter failure conditions.

See Also

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Introduced in R2014a

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