fix ruby 1.8 syntax error

Author: askreet

spec/rspec/mocks/and_invoke_spec.rb

@@ -22,10 +22,10 @@ module Mocks
         let(:callable) { lambda { nil } }
 
         it 'raises ArgumentError' do
-          expect { allow(obj).to receive(:foo).and_invoke(non_callable) }
-            .to raise_error(ArgumentError, "Arguments to `and_invoke` must be callable.")
-          expect { allow(obj).to receive(:foo).and_invoke(callable, non_callable) }
-            .to raise_error(ArgumentError, "Arguments to `and_invoke` must be callable.")
+          error = [ArgumentError, "Arguments to `and_invoke` must be callable."]
+
+          expect { allow(obj).to receive(:foo).and_invoke(non_callable) }.to raise_error(*error)
+          expect { allow(obj).to receive(:foo).and_invoke(callable, non_callable) }.to raise_error(*error)
         end
       end