Validate interface only with CI node validator

lib/gitlab/ci/config/node/cache.rb

@@ -8,30 +8,33 @@ module Gitlab
         class Cache < Entry
           include Configurable
 
+          node :key, Key,
+            description: 'Cache key used to define a cache affinity.'
+
+          node :untracked, Boolean,
+            description: 'Cache all untracked files.'
+
+          node :paths, Paths,
+            description: 'Specify which paths should be cached across builds.'
+
           validations do
-            validate :allowed_keys
+            validate :keys
 
             def unknown_keys
-              return [] unless @node.config.is_a?(Hash)
-
-              @node.config.keys - @node.class.nodes.keys
+              return [] unless config.is_a?(Hash)
+              config.keys - allowed_keys
             end
 
-            def allowed_keys
+            def keys
               if unknown_keys.any?
                 errors.add(:config, "contains unknown keys #{unknown_keys}")
               end
             end
           end
 
-          node :key, Node::Key,
-            description: 'Cache key used to define a cache affinity.'
-
-          node :untracked, Boolean,
-            description: 'Cache all untracked files.'
-
-          node :paths, Paths,
-            description: 'Specify which paths should be cached across builds.'
+          def allowed_keys
+            self.class.nodes.keys
+          end
         end
       end
     end

lib/gitlab/ci/config/node/validator.rb

@@ -8,12 +8,11 @@ module Gitlab
 
           def initialize(node)
             super(node)
-            @node = node
           end
 
           def messages
             errors.full_messages.map do |error|
-              "#{@node.key} #{error}".humanize
+              "#{key} #{error}".humanize
             end
           end
 

spec/lib/gitlab/ci/config/node/validator_spec.rb

@@ -5,7 +5,13 @@ describe Gitlab::Ci::Config::Node::Validator do
   let(:validator_instance) { validator.new(node) }
   let(:node) { spy('node') }
 
-  shared_examples 'delegated validator' do
+  describe 'delegated validator' do
+    before do
+      validator.class_eval do
+        validates :test_attribute, presence: true
+      end
+    end
+
     context 'when node is valid' do
       before do
         allow(node).to receive(:test_attribute).and_return('valid value')
@@ -40,28 +46,4 @@ describe Gitlab::Ci::Config::Node::Validator do
       end
     end
   end
-
-  describe 'attributes validations' do
-    before do
-      validator.class_eval do
-        validates :test_attribute, presence: true
-      end
-    end
-
-    it_behaves_like 'delegated validator'
-  end
-
-  describe 'interface validations' do
-    before do
-      validator.class_eval do
-        validate do
-          unless @node.test_attribute == 'valid value'
-            errors.add(:test_attribute, 'invalid value')
-          end
-        end
-      end
-    end
-
-    it_behaves_like 'delegated validator'
-  end
 end