\set ECHO none
    # Subtest: _null_count_test.test__definition()
    ok 1 - Function null_count(anyarray) should return integer
    ok 2 - Function null_count(anyarray) should not be strict
    ok 3 - Function null_count(anyarray) should be IMMUTABLE
    1..3
ok 1 - _null_count_test.test__definition
    # Subtest: _null_count_test.test__functionality()
    ok 1 - Test null_count(a, b, c)
    ok 2 - Test null_count(c, b, a)
    1..2
ok 2 - _null_count_test.test__functionality
ok 3
ok 4
1..4