I tend to use Hamcrest’s AssertThat now, but I still write Assert in some of my example code.
JUnit has a tendency to move code around, but it deprecates the old code, and there is usually a comment in the JUnit code somewhere explaining what to use instead.
These changes are usually for the better, so keeping our code up to date and changing the import statements is a small price to pay.
Short Answer? Use the import from