AssertAbsEqual

Similar to the AssertEqual method, this method is also used to verify whether the expected value of a test preparation step matches the actual result.

Similarly, a message is displayed here as well in the event of an error. However, the “AssertAbsEqual” method checks whether the expected value and the result are close enough to each other in terms of magnitude (absolute value). The amount must fall within the tolerance range, which you can also specify.

Syntax

METHOD PROTECTED AssertAbsEqual
VAR_INPUT
    actual         : LREAL;
    expected     : LREAL;
    tolerance     : LREAL;
    message        : STRING(255) := ''; // optional assert message
END_VAR

Inputs

Name	Type	Description
actual	LREAL	Value determined by the test performed
expected	LREAL	Expected value for the test case.
tolerance	LREAL	Permissible tolerance for this test case between the expected value and the calculated value.
message	STRING(255)	Error message if the test fails.

Example

AssertAbsEqual(actualValue, expectedValue, tolerance);