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verifyNotEmpty

Class: matlab.unittest.qualifications.Verifiable
Namespace: matlab.unittest.qualifications

Verify value is not empty

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Syntax

verifyNotEmpty(testCase,actual)
verifyNotEmpty(testCase,actual,diagnostic)

Description

verifyNotEmpty(testCase,actual) verifies that actual is a nonempty MATLAB® array.

example

verifyNotEmpty(testCase,actual,diagnostic) also associates the diagnostic information in diagnostic with the qualification.

example

Input Arguments

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Test case, specified as a matlab.unittest.qualifications.Verifiable object. Because the matlab.unittest.TestCase class subclasses matlab.unittest.qualifications.Verifiable and inherits its methods, testCase is typically a matlab.unittest.TestCase object.

Value to test, specified as an array of any data type.

Diagnostic information to display when the qualification passes or fails, specified as a string array, character array, function handle, or array of matlab.automation.diagnostics.Diagnostic objects.

Depending on the test runner configuration, the testing framework can display diagnostics when the qualification passes or fails. By default, the framework displays diagnostics only when the qualification fails. You can override the default behavior by customizing the test runner. For example, use a DiagnosticsOutputPlugin instance to display both failing and passing event diagnostics.

Example: "My Custom Diagnostic"

Example: @dir

Attributes

Sealedtrue

To learn about attributes of methods, see Method Attributes.

Examples

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Open Script

Create a test case for interactive testing.

testCase = matlab.unittest.TestCase.forInteractiveUse;

Test an empty character vector. The test fails.

verifyNotEmpty(testCase,'')

Verification failed.
    ---------------------
    Framework Diagnostic:
    ---------------------
    verifyNotEmpty failed.
    --> The value must not be empty.
    --> The value has a size of [0  0].
    
    Actual char:
      0×0 empty char array
    ------------------
    Stack Information:
    ------------------
    In C:\work\TestForNonemptyCharacterVectorsExample.m (TestForNonemptyCharacterVectorsExample) at 12
Open Script

Create a test case for interactive testing.

testCase = matlab.unittest.TestCase.forInteractiveUse;

Verify that the vector [2 3] is not empty. The test passes.

verifyNotEmpty(testCase,[2 3])

Verification passed.

Test if an array with a zero dimension is not empty. The test fails because an array with any zero dimension is empty.

verifyNotEmpty(testCase,ones(2,5,0,3))

Verification failed.
    ---------------------
    Framework Diagnostic:
    ---------------------
    verifyNotEmpty failed.
    --> The value must not be empty.
    --> The value has a size of [2  5  0  3].
    
    Actual Value:
      2×5×0×3 empty double array
    ------------------
    Stack Information:
    ------------------
    In C:\work\TestForNonemptyNumericArraysExample.m (TestForNonemptyNumericArraysExample) at 17
Open Live Script

Create a test case for interactive testing.

testCase = matlab.unittest.TestCase.forInteractiveUse;

Verify that a cell array containing empty numeric arrays is not empty.

verifyNotEmpty(testCase,{[],[],[]})
Verification passed.
Open Script

Create a test case for interactive testing.

testCase = matlab.unittest.TestCase.forInteractiveUse;

Create and test an empty test suite. The test fails.

emptyTestSuite = matlab.unittest.TestSuite.empty;
verifyNotEmpty(testCase,emptyTestSuite,"Value must be nonempty.")

Verification failed.
    ----------------
    Test Diagnostic:
    ----------------
    Value must be nonempty.
    ---------------------
    Framework Diagnostic:
    ---------------------
    verifyNotEmpty failed.
    --> The value must not be empty.
    --> The value has a size of [0  0].
    
    Actual Value:
      0×0 TestSuite array with no properties.
    ------------------
    Stack Information:
    ------------------
    In C:\work\TestForNonemptyTestSuitesExample.m (TestForNonemptyTestSuitesExample) at 13

Tips

  • verifyNotEmpty is a convenience method. For example, verifyNotEmpty(testCase,actual) is functionally equivalent to the following code.

    import matlab.unittest.constraints.IsEmpty
testCase.verifyThat(actual,~IsEmpty)

  • Use verification qualifications to produce and record failures without throwing an exception. Because verifications do not throw exceptions, all test content runs to completion even when verification failures occur. Typically, verifications are the primary qualification for a unit test because they typically do not require an early exit from the test. Use other qualification types to test for violation of preconditions or incorrect test setup:

    • Use assumption qualifications to ensure that the test environment meets preconditions that otherwise do not result in a test failure. Assumption failures result in filtered tests, and the testing framework marks the tests as Incomplete. For more information, see matlab.unittest.qualifications.Assumable.

    • Use assertion qualifications when the failure condition invalidates the remainder of the current test content but does not prevent proper execution of subsequent tests. A failure at the assertion point renders the current test as Failed and Incomplete. For more information, see matlab.unittest.qualifications.Assertable.

    • Use fatal assertion qualifications to abort the test session upon failure. These qualifications are useful when the failure is so fundamental that continuing testing does not make sense. Fatal assertion qualifications are also useful when fixture teardown does not restore the environment state correctly, and aborting testing and starting a fresh session is preferable. For more information, see matlab.unittest.qualifications.FatalAssertable.

Version History

Introduced in R2013a

See Also

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