[Spec] Add test for Validator#_validate_modulemap

spec/unit/validator_spec.rb

@@ -445,6 +445,16 @@ module Pod
           validator.results.map(&:to_s).first.should.match /Unable to find a license file/
           validator.result_type.should == :warning
         end
+
+        it 'checks module_map must exist if specified' do
+          file = write_podspec(stub_podspec(/.*source_files.*/, '"source_files": "JSONKit.*", "module_map": "JSONKit.modulemap",'))
+          validator = Validator.new(file, SourcesManager.master.map(&:url))
+          validator.stubs(:build_pod)
+          validator.stubs(:validate_url)
+          validator.validate
+          validator.results.map(&:to_s).first.should.match /Unable to find the specified module map file./
+          validator.result_type.should == :error
+        end
       end
 
       it 'validates a podspec with dependencies' do