How to dynamically set method/class setup parameters

Question

Jack German 2018-7-11

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/409881-how-to-dynamically-set-method-class-setup-parameters

评论： Steven Lord 2018-7-12

hi,

I'm trying to write a parameterized test where one class setup parameter depends on another one. I'm running it from a script.

myScript.m:

suite = matlab.unittest.TestSuite.fromClass(?myTest)
runner = matlab.unittest.TestRunner.withTextOutput();
results = runner.run(suite);

The test class is defined in a seperate file:

 classdef myTest < matlab.unittest.TestCase
   properties(ClassSetupParameter)
     prop1 = foo();
     prop2 = {1,2,3};
     prop3 = bar(prop1);
   end
 end
 function foo_result = foo()
   foo_result = {3,4,5};
 end
 function bar_result = bar(prop1)
   bar_result = prop1 -1;
 end

I'm getting an error:

Error using myScript (line 1)
Invalid default value for property 'prop3' in class 'myTest':
Undefined function or variable 'prop1'.

I have also tried seperating prop1 and prop3 to Class and Method setup parameters:

   classdef myTest < matlab.unittest.TestCase
     properties(ClassSetupParameter)
       prop1 = foo();
       prop2 = {1,2,3};
     end
     properties(MethodSetupParameter)
       prop3 = bar(prop1);
     end
   end
   function foo_result = foo()
     foo_result = {3,4,5};
   end
   function bar_result = bar(prop1)
    bar_result = prop1 -1;
   end

And I'm getting the same error

Any ideas how to overcome this? I really don't want to have another loop inside any test method.

I'm on Matlab 2017a

Thank you! Jack

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Answer 1

Steven Lord 2018-7-11

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/409881-how-to-dynamically-set-method-class-setup-parameters#answer_328444

在 MATLAB Online 中打开

Try this:

classdef myTest < matlab.unittest.TestCase
    properties(ClassSetupParameter)
        prop1 = foo();
    end
      properties
          prop3;
      end
      methods(TestClassSetup)
          function setup_prop3(testcase, prop1)
              testcase.prop3 = computeProp3FromProp1(prop1);
          end
      end
      methods(Test)
          function displayProp3(testcase)
              testcase.log(sprintf('The value of prop3 is %d.\n', testcase.prop3));
          end
      end
  end
function y = foo()
y = {3, 4, 5};
end
function y = computeProp3FromProp1(p)
y = p-1;
end

To see that the prop3 property takes on the values 2, 3, and 4 run this with concise logging.

suite = matlab.unittest.TestSuite.fromClass(?myTest)
runner = matlab.unittest.TestRunner.withTextOutput();
L = matlab.unittest.plugins.LoggingPlugin.withVerbosity(matlab.unittest.Verbosity.Concise);
runner.addPlugin(L);
results = runner.run(suite)

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Steven Lord 2018-7-12

在 MATLAB Online 中打开

So you want to run your TestClassSetup method 27 (3^3) times, each with a different combination of prop1, prop2, and prop3 values? In that case, I'd make a Constant property from which prop1 and prop3 can be computed. As stated in the documentation (this page hasn't change much if at all between release R2017a and release R2018a):

"MATLAB evaluates the expressions used in the class definition without any workspace. Therefore, these expressions cannot reference variables of any kind.

MATLAB evaluates expressions in the context of the class file, so these expressions can access any functions, static methods, and constant properties of other classes that are on your path at the time MATLAB initializes the class. Expressions defining property default values can access constant properties defined in their own class."

So try running this test as before.

classdef myTest < matlab.unittest.TestCase
    properties(Constant)
        propertyFoo = foo();
    end
    properties(ClassSetupParameter)
        prop1 = myTest.propertyFoo;
        prop2 = {pi, exp(1), 42};
        prop3 = computeProp3FromProp1(myTest.propertyFoo);
    end
    methods(TestClassSetup)
        function displayPropertyValues(testcase, prop1, prop2, prop3)
            testcase.log(sprintf('The value of prop1 is %d.\n', prop1));
            testcase.log(sprintf('The value of prop2 is %f.\n', prop2));
            testcase.log(sprintf('The value of prop3 is %d.\n', prop3));
        end
    end
    methods(Test)
        function onePlusOne(testcase)
            testcase.verifyEqual(1+1, 2);
        end
    end
end
function y = foo()
y = {3, 4, 5};
end
function y = computeProp3FromProp1(p)
y = cellfun(@(x) x-1, p, 'UniformOutput', false);
end

When you run this you should see the onePlusOne test run 27 times, with each combination of values for prop1, prop2, and prop3. FYI, if running each of your tests for each of the 27 combinations is a bit much, consider specifying the ParameterCombination attribute as 'pairwise'.

methods(TestClassSetup, ParameterCombination = 'pairwise')

Jack German 2018-7-12

I'm trying to accomplish the second option. While prop1 is (say) 1 prop3 will change from 1 to a number that can be determined from prop1.

Steven Lord 2018-7-12

在 MATLAB Online 中打开

Rather than using two separate properties in that case I'd probably assemble a cell array of vectors, the first element of each vector being the value of prop1 and the second prop3, and use that cell array as the property.

prop13 = {[1 1], [1 2], [2 1], [2 2], [2 3]};

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