Minitest-ok 0.1.0 released. Using Minitest::Ok, you can write:

ok {1+1} == 2      # instead of: assert_equal 2, 1+1
ok {1+1} > 0       # instead of: assert_operator 1+1, :>, 0
ok {5}.in?(1..9)   # instead of: assert_include 1..9, 5

and so on.

See README for details.