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matlab.mock.constraints.WasAccessed class

Package: matlab.mock.constraints

Constraint determining property get access

Description

The WasAccessed constraint produces a qualification failure if an actual value is not a PropertyBehavior instance, or if the property that corresponds to the PropertyBehavior was not accessed the specified number of times.

The number of times a property is accessed includes the number of times that MATLAB® implicitly accesses the property. For example, if you display a mock object, MATLAB accesses the object properties to display their values.

Construction

constraint = WasAccessed provides a constraint that determines the property get access. If a property was accessed at least once, the constraint is satisfied. To qualify that a property was not accessed, negate the WasAccessed constraint with the tilde (~) operator.

constraint = WasAccessed('WithCount',n) provides a constraint that is satisfied when a property was accessed exactly n times.

If you negate WasAccessed with this syntax, if the property was not accessed exactly n times, the constraint passes. For example, if a property was accessed 4 times, ~WasAccessed('WithCount',3) passes and ~WasAccessed('WithCount',4) fails.

Input Arguments

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Number of times of property get access, specified as an integer.

Properties

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Property access count, returned as an integer. This property is read-only once the constraint is constructed. You can specify it during constraint construction.

Copy Semantics

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

Examples

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Create a mock for a person class.

testCase = matlab.mock.TestCase.forInteractiveUse;
[fakePerson,behavior] = testCase.createMock('AddedProperties',["Name" "Age"]);
fakePerson.Name = 'David';
fprintf(1,'The person''s name is %s.\n',fakePerson.Name);
The person's name is David.

Construct passing cases.

import matlab.mock.constraints.WasAccessed
testCase.verifyThat(behavior.Name,WasAccessed)
Interactive verification passed.
testCase.verifyThat(behavior.Age,~WasAccessed)
Interactive verification passed.
testCase.verifyThat(behavior.Name,WasAccessed('WithCount',1))
Interactive verification passed.

Construct failing cases.

testCase.verifyThat(behavior.Name,~WasAccessed)
Interactive verification failed.

---------------------
Framework Diagnostic:
---------------------
Negated WasAccessed failed.
--> Property 'Name' was unexpectedly accessed 1 time(s).

Specified property access:
    PropertyGetBehavior
        <Mock>.Name
testCase.verifyThat(behavior.Age,WasAccessed)
Interactive verification failed.

---------------------
Framework Diagnostic:
---------------------
WasAccessed failed.
--> Property 'Age' was never accessed.

Specified property access:
    PropertyGetBehavior
        <Mock>.Age
testCase.verifyThat(behavior.Name,WasAccessed('WithCount',5))
Interactive verification failed.

---------------------
Framework Diagnostic:
---------------------
WasAccessed failed.
--> Property 'Name' was not accessed the expected number of times.
    
    Actual property access count:
             1
    Expected property access count:
             5

Specified property access:
    PropertyGetBehavior
        <Mock>.Name

Introduced in R2017a

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