Added assert_xpath and assert_no_xpath for Test::Unit support.

lib/webrat/core/matchers/have_xpath.rb

@@ -79,5 +79,15 @@ module Webrat
     end
     alias_method :match_xpath, :have_xpath
     
+    def assert_xpath(expected, &block)
+      hs = HaveXpath.new(expected, &block)
+      raise Test::Unit::AssertionFailedError.new(hs.failure_message) unless hs.matches?(response_body)
+    end
+    
+    def assert_no_xpath(expected, &block)
+      hs = HaveXpath.new(expected, &block)
+      raise Test::Unit::AssertionFailedError.new(hs.negative_failure_message) if hs.matches?(response_body)
+    end
+    
   end
 end

spec/public/matchers_spec.rb

@@ -54,6 +54,33 @@ describe Webrat::Matchers do
       }.should raise_error(Spec::Expectations::ExpectationNotMetError)
     end
     
+    describe 'asserts for xpath' do
+       before(:each) do
+          should_receive(:response_body).and_return @body
+          require 'test/unit'
+        end
+        describe "assert_xpath" do
+          it "should pass when body contains the selection" do
+            assert_xpath("//div")
+          end
+
+          it "should throw an exception when the body doesnt have matching xpath" do
+            lambda {assert_xpath("//p")}.should raise_error(Test::Unit::AssertionFailedError)
+          end
+
+        end
+
+        describe "assert_no_xpath" do
+          it "should pass when the body doesn't contan the xpath" do
+            assert_no_xpath("//p")
+          end
+
+          it "should throw an exception when the body does contain the xpath" do
+            lambda {assert_no_xpath("//div")}.should raise_error(Test::Unit::AssertionFailedError)
+          end
+        end
+    end
+    
   end
   
   describe "#have_selector" do