fix(webhooks): correctly validate HTTP method when the given method i…

…s not a valid class name

lib/pact_broker/api/contracts/webhook_contract.rb

@@ -130,6 +130,8 @@ def self.host_error_message
 
               def valid_method?(http_method)
                 Net::HTTP.const_defined?(http_method.capitalize)
+              rescue StandardError
+                false
               end
 
               def valid_url?(url)

spec/lib/pact_broker/api/contracts/webhook_contract_spec.rb

@@ -372,6 +372,18 @@ def valid_webhook_with
               expect(subject.errors[:enabled]).to eq ["cannot have a template parameter in the host"]
             end
           end
+
+          context "with a dodgey method" do
+            let(:json) do
+              valid_webhook_with do |hash|
+                hash["request"]["method"] = "Post%0d%0a"
+              end
+            end
+
+            it "contains an error" do
+              expect(subject.errors[:"request.http_method"]).to eq ["is not a recognised HTTP method"]
+            end
+          end
         end
       end
     end