describe :env_value, shared: true do before :each do @saved_foo = ENV["foo"] end after :each do ENV["foo"] = @saved_foo end it "returns true if ENV has the value" do ENV["foo"] = "bar" ENV.send(@method, "bar").should == true end it "returns false if ENV doesn't have the value" do ENV.send(@method, "foo").should == false end it "returns nil if the argument is not a String and does not respond to #to_str" do ENV.send(@method, Object.new).should == nil end end