Add spec for some strategy methods

spec/unit/mutant/strategy_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe Mutant::Strategy do
+
+  let(:class_under_test) do
+    Class.new(described_class)
+  end
+
+  let(:object) { class_under_test.new }
+
+  describe '#teardown' do
+    subject { object.teardown }
+    it_should_behave_like 'a command method'
+  end
+
+  describe '#setup' do
+    subject { object.setup }
+    it_should_behave_like 'a command method'
+  end
+end
+