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Require only minitest.
minitest/autorun required minitest/spec and we are avoiding to require
Alias refute methods to assert_not and perfer assert_not on tests
Inherit from MiniTest::Unit::TestCase instead of MiniTest::Spec
Revert "minitest provides "it" and "describe""
This reverts commit 22bc12e.
REASON: We will remove the MiniTest::Spec from Rails and we need these