Validate that the key contains the data

spec/helpers/commits_helper_spec.rb

@@ -291,7 +291,7 @@ RSpec.describe CommitsHelper do
   end
 
   describe "#commit_partial_cache_key" do
-    subject { helper.commit_partial_cache_key(commit, ref: ref, merge_request: merge_request, request: request) }
+    subject(:cache_key) { helper.commit_partial_cache_key(commit, ref: ref, merge_request: merge_request, request: request) }
 
     let(:commit) { create(:commit).present(current_user: user) }
     let(:commit_status) { Gitlab::Ci::Status::Running.new(pipeline, user) }
@@ -323,5 +323,12 @@ RSpec.describe CommitsHelper do
         }
       )
     end
+
+    describe "final cache key output" do
+      subject { ActiveSupport::Cache.expand_cache_key(cache_key) }
+
+      it { is_expected.to include(commit.cache_key) }
+      it { is_expected.to include(pipeline.cache_key) }
+    end
   end
 end

spec/lib/gitlab/ci/status/core_spec.rb

+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe Gitlab::Ci::Status::Core do
+  let(:subj) { double("subject", cache_key: "foo") }
+
+  subject(:status) do
+    described_class.new(subj, double("user"))
+  end
+
+  describe "#cache_key" do
+    it "uses the subject's cache key" do
+      expect(status.cache_key).to eq(subj.cache_key)
+    end
+  end
+end