Django: is there a way to count SQL queries from an unit test?

Since Django 1.3 there is a assertNumQueries available exactly for this purpose.

One way to use it (as of Django 3.2) is as a context manager:

# measure queries of some_func and some_func2
with self.assertNumQueries(2):
    result = some_func()
    result2 = some_func2()