junit5 - How to use lambdas for TestNG failed assertion messages? - Stack Overflow

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JUnit 5 introduced lambdas for messages of failed assertions. So the message is only evaluated after a failed assertion.

For example, if I have this in TestNG:

Optional<Data> data = ...;
assertTrue(data.isEmpty(), data.get().toString());

it will cause an exception if data is isEmpty, although the test should pass. In JUnit 5 I can use this instead:

Optional<Data> data = ...;
assertTrue(data.isEmpty(), () -> data.get().toString());

So data.get().toString() is only run if it has data. No exception happens, the unit-test runs normal.

I know I can mix TestNG and JUnit, but I would prefer not to do this, because it can become confusing (for example, the parameter order for many identical named assertions is switched).

Is there any possibility to do this in TestNG, maybe with a another library, which extends TestNG?

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