1 files changed, 63 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/config/entry/tags_spec.rb b/spec/lib/gitlab/ci/config/entry/tags_spec.rb
new file mode 100644
index 00000000000..79317de373b
--- /dev/null
+++ b/spec/lib/gitlab/ci/config/entry/tags_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Ci::Config::Entry::Tags do
+  let(:entry) { described_class.new(config) }
+
+  describe 'validation' do
+    context 'when tags config value is correct' do
+      let(:config) { %w[tag1 tag2] }
+
+      describe '#value' do
+        it 'returns tags configuration' do
+          expect(entry.value).to eq config
+        end
+      end
+
+      describe '#valid?' do
+        it 'is valid' do
+          expect(entry).to be_valid
+        end
+      end
+    end
+
+    context 'when entry value is not correct' do
+      describe '#errors' do
+        context 'when tags config is not an array of strings' do
+          let(:config) { [1, 2] }
+
+          it 'reports error' do
+            expect(entry.errors)
+              .to include 'tags config should be an array of strings'
+          end
+        end
+
+        context 'when tags limit is reached' do
+          let(:config) { Array.new(50) {|i| "tag-#{i}" } }
+
+          context 'when ci_build_tags_limit is enabled' do
+            before do
+              stub_feature_flags(ci_build_tags_limit: true)
+            end
+
+            it 'reports error' do
+              expect(entry.errors)
+                .to include "tags config must be less than the limit of #{described_class::TAGS_LIMIT} tags"
+            end
+          end
+
+          context 'when ci_build_tags_limit is disabled' do
+            before do
+              stub_feature_flags(ci_build_tags_limit: false)
+            end
+
+            it 'does not report an error' do
+              expect(entry.errors).to be_empty
+            end
+          end
+        end
+      end
+    end
+  end
+end