class RuboCop::Cop::Minitest::AssertInstanceOf

This cop enforces the test to use `assert_instance_of(Class, object)` over `assert(object.instance_of?(Class))`.

@example

# bad
assert(object.instance_of?(Class))
assert(object.instance_of?(Class), 'message')

# good
assert_instance_of(Class, object)
assert_instance_of(Class, object, 'message')