Handle missing link elements

lib/webcat.rb

@@ -3,6 +3,7 @@ module Webcat
 
   class WebcatError < StandardError; end
   class DriverNotFoundError < WebcatError; end
+  class ElementNotFound < WebcatError; end
 
   class << self
     attr_accessor :debug

lib/webcat/session.rb

@@ -22,13 +22,21 @@ class Webcat::Session
   end
   
   def click_link(locator)
-    link = driver.find("//a[@id='#{locator}']").first
-    link ||= driver.find(%{//a[text()="#{locator}"]}).first
-    link ||= driver.find(%{//a[@title="#{locator}"]}).first
-    link.click
+    find_element("//a[@id='#{locator}']", %{//a[text()="#{locator}"]}, %{//a[@title="#{locator}"]}).click
   end
 
   def body
     driver.body
   end
+
+private
+
+  def find_element(*locators)
+    locators.each do |locator|
+      element = driver.find(locator).first
+      return element if element
+    end
+    raise Webcat::ElementNotFound, "element not found"
+  end
+  
 end

spec/session_spec.rb

@@ -18,9 +18,12 @@ describe Webcat::Session do
     end
     
     describe '#click_link' do
+      before do
+        @session.visit('/with_html')
+      end
+
       context "with id given" do
         it "should take user to the linked page" do
-          @session.visit('/with_html')
           @session.click_link('foo')
           @session.body.should == 'Another World'
         end
@@ -28,7 +31,6 @@ describe Webcat::Session do
       
       context "with text given" do
         it "should take user to the linked page" do
-          @session.visit('/with_html')
           @session.click_link('labore')
           @session.body.should == '<h1>Bar</h1>'
         end
@@ -36,11 +38,18 @@ describe Webcat::Session do
 
       context "with title given" do
         it "should take user to the linked page" do
-          @session.visit('/with_html')
           @session.click_link('awesome title')
           @session.body.should == '<h1>Bar</h1>'
         end
       end
+
+      context "with a locator that doesn't exist" do
+        it "should raise an error" do
+          running do
+            @session.click_link('does not exist')
+          end.should raise_error(Webcat::ElementNotFound)
+        end
+      end
     end
   end