What Is Assert in Scala

assert is a precondition in Scala that evaluates a boolean expression as true or false. It’s generally used to validate the execution of the program during runtime. We can see assert is used commonly in testing the functionality of programs.

What does an assert do?

An assert is a preprocessor macro that is used to evaluate a conditional expression. If the conditional expression evaluates false, then the program is terminated after displaying the error message.

What is assert message?

From a test readability perspective, assertion messages are code comments. Instead of relying on them, refactor tests to be self-documenting. In terms of ease of diagnostics, a better alternative to assertion messages is: Making tests verify a single unit of behavior.