[Validator] Validate that resource bundles contain resources

lib/cocoapods/validator.rb

@@ -556,6 +556,13 @@ module Pod
       end
     end
 
+    def _validate_resource_bundles
+      file_accessor.resource_bundles.each do |bundle, resource_paths|
+        next unless resource_paths.empty?
+        error('file patterns', "The `resource_bundles` pattern for `#{bundle}` did not match any file.")
+      end
+    end
+
     # Ensures that a list of header files only contains header files.
     #
     def _validate_header_files(attr_name)

spec/unit/validator_spec.rb

@@ -642,6 +642,23 @@ module Pod
           validator.results.map(&:to_s).first.should.match /Unexpected file extension for modulemap file \(JSONKit\.m\)/
           validator.result_type.should == :error
         end
+
+        it 'checks resource bundles have resources' do
+          file = write_podspec(stub_podspec(/.*source_files.*/, <<-JSON))
+            "source_files": "JSONKit.*",
+            "resource_bundles": {
+              "bundle1": ["CHANGELOG.md", "*.md"],
+              "bundle2": "foo.bar*"
+            },
+          JSON
+
+          validator = Validator.new(file, config.sources_manager.master.map(&:url))
+          validator.stubs(:build_pod)
+          validator.stubs(:validate_url)
+          validator.validate
+          validator.results.map(&:to_s).first.should.include 'The `resource_bundles` pattern for `bundle2` did not match any file'
+          validator.result_type.should == :error
+        end
       end
 
       it 'validates a podspec with dependencies' do