Fix ci config cache validation in legacy processor

lib/ci/gitlab_ci_yaml_processor.rb

@@ -127,8 +127,8 @@ module Ci
 
     def validate_global_cache!
       @cache.keys.each do |key|
-        unless ALLOWED_CACHE_KEYS.include? key
-          raise ValidationError, "#{name} cache unknown parameter #{key}"
+        unless ALLOWED_CACHE_KEYS.include?(key)
+          raise ValidationError, "Cache config has unknown parameter: #{key}"
         end
       end
 

spec/lib/ci/gitlab_ci_yaml_processor_spec.rb

@@ -591,7 +591,20 @@ module Ci
       end
     end
 
-    describe "Caches" do
+    describe 'cache' do
+      context 'when cache definition has unknown keys' do
+        it 'raises relevant validation error' do
+          config = YAML.dump(
+            { cache: { untracked: true, invalid: 'key' },
+              rspec: { script: 'rspec' } })
+
+          expect { GitlabCiYamlProcessor.new(config) }.to raise_error(
+            GitlabCiYamlProcessor::ValidationError,
+            'Cache config has unknown parameter: invalid'
+          )
+        end
+      end
+
       it "returns cache when defined globally" do
         config = YAML.dump({
                              cache: { paths: ["logs/", "binaries/"], untracked: true, key: 'key' },