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Assertions are the only way to define if a unit test PASS or FAIL, by comparing the result that you get against the expected one.

An assertion is a function that compares the first two parameters and displays a message (3rd parameter) if they are different.

Through assertions, the value obtained is verified in order to check if it equals to the expected one.

You can use assertions for everything, like a test if database table rows are expected ones or to check if an SDT has the correct (expected) data.

IMPORTANT: You can add as many assertions as you want, but if at least one of them fails, the Test will be marked as FAILED and the error message will be displayed on the Test Results panel. Otherwise, the test will PASS. Currently, there are only 3 types of assertions to use inside GXtest Module:

AssertNumericEquals (in:&ExpectedValue, in:&ObtainedValue, in:&FailureMessage)
to verify that 2 numeric values are equals.
AssertStringEquals (in:&ExpectedValue, in:&ObtainedValue, in:&FailureMessage)
to verify that 2 strings are equals.
AssertBoolEquals(in:&ExpectedValue, in:&ObtainedValue,in:&FailureMessage)
to verify that 2 boolean values are equals.

AssertStringEquals is the most generic and useful function since almost any structure can be serialized as a string.

For example, if you want to test a procedure that uses an SDT as output, you can check its value by comparing the SDT as a JSON string like this:
AssertStringEquals(&SDTcountryExpected.ToJSON(), &SDTcountryObtained.ToJSON(), “The country data is different”)

You might also want to check a specific field of the SDT. You can do this by using something like:

AssertStringEquals(&SDTexpected.fieldX, &SDTobtained.fieldX, “Field X is wrong”)

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