added assert_selector

lib/webrat/core/matchers/have_selector.rb

@@ -33,5 +33,20 @@ module Webrat
     end
     alias_method :match_selector, :have_selector
     
+    
+    # Asserts that the body of the response contains
+    # the supplied selector
+    def assert_selector(expected)
+      hs = HaveSelector.new(expected)
+      raise Test::Unit::AssertionFailedError.new(hs.failure_message) unless hs.matches?(response_body)
+    end
+    
+    # Asserts that the body of the response
+    # does not contain the supplied string or regepx
+    def assert_no_selector(expected)
+      hs = HaveSelector.new(expected)
+      raise Test::Unit::AssertionFailedError.new(hs.negative_failure_message) if hs.matches?(response_body)
+    end
+    
   end
 end

spec/public/matchers_spec.rb

@@ -86,6 +86,33 @@ describe Webrat::Matchers do
       }.should raise_error(Spec::Expectations::ExpectationNotMetError)
     end
     
+    describe "asserts for selector," do
+      before(:each) do
+        should_receive(:response_body).and_return @body
+        require 'test/unit'
+      end
+      describe "assert_selector" do
+        it "should pass when body contains the selection" do
+          assert_selector("div")
+        end
+        
+        it "should throw an exception when the body doesnt have matching selection" do
+          lambda {assert_selector("p")}.should raise_error(Test::Unit::AssertionFailedError)
+        end
+        
+      end
+      
+      describe "assert_not_selector" do
+        it "should pass when the body doesn't contan the selection" do
+          assert_no_selector("p")
+        end
+        
+        it "should throw an exception when the body does contain the selection" do
+          lambda {assert_no_selector("div")}.should raise_error(Test::Unit::AssertionFailedError)
+        end
+      end
+    end
+    
   end
   
   describe "#have_tag" do