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matlab.mock.actions.AssignOutputs Class

Namespace: matlab.mock.actions

Define return values for method called or property accessed


To specify the values that the framework returns when a mock object method is invoked or a mock object property is accessed, use the AssignOutputs class.

If you call a mocked method with fewer outputs than specified by AssignOutputs, the remaining outputs are discarded. If you call a mocked method with more outputs than specified by AssignOutputs, MATLAB® throws an error.


action = AssignOutputs(A1,...,An) defines the values for the mock object to return for a method call or property access. The AssignOutputs constructor accepts one or more values, A1,...,An, that correspond to the values for the output arguments of the mock object method or the value of the mock object property.

Input Arguments

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Return values, specified as scalars, vectors, matrices, or multidimensional arrays. Return values can be any data type.

Example: "mySpecifiedValue"

Example: 7,13,42

Example: [1 2 3;4 5 6]


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Predefined return values, returned as a cell array of arguments. Return values are specified during class construction, and can be any data type.

Data Types: cell


repeatRepeat defining return values
thenAction for mock object interaction or action subsequent to defining return values

Copy Semantics

Value. To learn how value classes affect copy operations, see Copying Objects.


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Create a mock for a quadrilateral class.

testCase = matlab.mock.TestCase.forInteractiveUse;
[mock,behavior] = testCase.createMock('AddedMethods',"sideLengths");

Set up behavior.

import matlab.mock.actions.AssignOutputs;

Use the mock.

[a,b,c,d] = mock.sideLengths


  • The AssignOutputs action defines the value of the output at instance creation time. To specify that a mock object method invoke a function handle to determine output values when a mock object method is called, use the Invoke class.


For simple definition of outputs, you can use the assignOutputsWhen method of the matlab.mock.TestCase class. However, there is more functionality when you use the AssignOutputs action.

Version History

Introduced in R2017a