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Assertions: fail() and assertInstanceOf()

Let's describe the fail() and assertInstanceOf() methods in JUnit 5.

We'll cover the following...

The fail() method

The fail() method fails a test with a given message and/or Throwable. Below are the overloaded methods of fail().

JUnit5 v5.8
fail(String message)
fail(Supplier<String> messageSupplier)
fail(Throwable cause)
fail(String message, Throwable cause)

A fail() actually has a generic return type so that a single fail() statement can be ...