Import mspec tests to run our spec code

.streerc

@@ -25,5 +25,6 @@
 --ignore-files=lib/uri*
 --ignore-files=spec/*
 --ignore-files=test/support/version.rb*
+--ignore-files=test/support/spec_helpers/matchers/*
 
 --plugins=plugin/trailing_comma,plugin/single_quotes,plugin/disable_auto_ternary

spec/core/kernel/Complex_spec.rb

@@ -191,7 +191,7 @@
         n2 = mock_numeric("n2")
         n3 = mock_numeric("n3")
         n4 = mock_numeric("n4")
-        NATFIXME 'when passed Numerics n1 and n2 and at least one responds to #real? with false', exception: ArgumentError, message: 'comparison of MockNumeric with 0 failed' do
+        NATFIXME 'when passed Numerics n1 and n2 and at least one responds to #real? with false', exception: SpecFailedException, message: 'comparison of MockNumeric with 0 failed' do
           n1.should_receive(:real?).any_number_of_times.and_return(r1)
           n2.should_receive(:real?).any_number_of_times.and_return(r2)
           n2.should_receive(:*).with(Complex(0, 1)).and_return(n3)

test/support/mspec.rb

@@ -1,4 +1,4 @@
-class MSpec
+module MSpec
   def self.features
     @features || {}
   end