The expectation failure message contains a list of made requests.

lib/webmock/request_execution_verifier.rb

@@ -27,21 +27,29 @@ def does_not_match?
 
     def failure_message
       expected_times_executed = @expected_times_executed || 1
-      %Q(The request #{request_pattern.to_s} was expected to execute #{times(expected_times_executed)} but it executed #{times(times_executed)})
+      text = %Q(The request #{request_pattern.to_s} was expected to execute #{times(expected_times_executed)} but it executed #{times(times_executed)})
+      text << executed_requests
+      text
     end
 
     def negative_failure_message
-      if @expected_times_executed
+      text = if @expected_times_executed
         %Q(The request #{request_pattern.to_s} was not expected to execute #{times(expected_times_executed)} but it executed #{times(times_executed)})
       else
         %Q(The request #{request_pattern.to_s} was expected to execute 0 times but it executed #{times(times_executed)})
       end
+      text << executed_requests
+      text
     end
 
     private
 
     def times(times)
       "#{times} time#{ (times == 1) ? '' : 's'}"
     end
+
+    def executed_requests
+      "\n\nThe following requests were made:\n\n#{RequestRegistry.instance.to_s}\n" + "="*60
+    end
   end
 end

spec/request_execution_verifier_spec.rb

@@ -5,6 +5,8 @@
     @verifier = WebMock::RequestExecutionVerifier.new
     @request_pattern = mock(WebMock::RequestPattern, :to_s => "www.example.com")
     @verifier.request_pattern = @request_pattern
+    WebMock::RequestRegistry.instance.stub(:to_s).and_return("executed requests")
+    @executed_requests_info = "\n\nThe following requests were made:\n\nexecuted requests\n" + "="*60
   end
 
 
@@ -13,13 +15,17 @@
     it "should report failure message" do
       @verifier.times_executed = 0
       @verifier.expected_times_executed = 2
-      @verifier.failure_message.should == "The request www.example.com was expected to execute 2 times but it executed 0 times"
+      expected_text = "The request www.example.com was expected to execute 2 times but it executed 0 times"
+      expected_text << @executed_requests_info
+      @verifier.failure_message.should == expected_text  
     end
 
     it "should report failure message correctly when executed times is one" do
       @verifier.times_executed = 1
       @verifier.expected_times_executed = 1
-      @verifier.failure_message.should == "The request www.example.com was expected to execute 1 time but it executed 1 time"
+      expected_text = "The request www.example.com was expected to execute 1 time but it executed 1 time"
+      expected_text << @executed_requests_info
+      @verifier.failure_message.should == expected_text
     end
 
   end
@@ -29,12 +35,16 @@
     it "should report failure message if it executed number of times specified" do
       @verifier.times_executed = 2
       @verifier.expected_times_executed = 2
-      @verifier.negative_failure_message.should == "The request www.example.com was not expected to execute 2 times but it executed 2 times"
+      expected_text = "The request www.example.com was not expected to execute 2 times but it executed 2 times"
+      expected_text << @executed_requests_info
+      @verifier.negative_failure_message.should == expected_text
     end
 
     it "should report failure message when not expected request but it executed" do
       @verifier.times_executed = 1
-      @verifier.negative_failure_message.should == "The request www.example.com was expected to execute 0 times but it executed 1 time"
+      expected_text = "The request www.example.com was expected to execute 0 times but it executed 1 time"
+      expected_text << @executed_requests_info
+      @verifier.negative_failure_message.should == expected_text
     end
 
   end