Add message for missing license when using coverage fuzzing

changelogs/unreleased/add_msg_for_missing_license_covfuzz.yml

+---
+title: Show error in pipeline when Coverage Fuzzing not licensed
+merge_request: 46652
+author:
+type: changed

ee/spec/lib/gitlab/ci/templates/coverage_fuzzing_gitlab_ci_yaml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Coverage-Fuzzing.gitlab-ci.yml' do
+  subject(:template) { Gitlab::Template::GitlabCiYmlTemplate.find('Coverage-Fuzzing') }
+
+  describe 'the created pipeline' do
+    let(:user) { create(:admin) }
+    let(:default_branch) { 'master' }
+    let(:project) { create(:project, :custom_repo, files: { 'README.txt' => '' }) }
+    let(:service) { Ci::CreatePipelineService.new(project, user, ref: 'master' ) }
+    let(:pipeline) { service.execute!(:push) }
+    let(:build_names) { pipeline.builds.pluck(:name) }
+
+    before do
+      stub_ci_pipeline_yaml_file(template.content)
+      allow_any_instance_of(Ci::BuildScheduleWorker).to receive(:perform).and_return(true)
+      allow(project).to receive(:default_branch).and_return(default_branch)
+    end
+
+    context 'when project has no license' do
+      it 'includes job to display error' do
+        expect(build_names).to match_array(%w[coverage_fuzzing_unlicensed])
+      end
+    end
+
+    context 'when project has Ultimate license' do
+      let(:license) { create(:license, plan: License::ULTIMATE_PLAN) }
+
+      before do
+        allow(License).to receive(:current).and_return(license)
+      end
+
+      context 'by default' do
+        it 'includes no job' do
+          expect { pipeline }.to raise_error(Ci::CreatePipelineService::CreateError)
+        end
+      end
+
+      context 'when COVFUZZ_DISABLED=1' do
+        before do
+          create(:ci_variable, project: project, key: 'COVFUZZ_DISABLED', value: '1')
+        end
+
+        it 'includes no jobs' do
+          expect { pipeline }.to raise_error(Ci::CreatePipelineService::CreateError)
+        end
+      end
+    end
+  end
+end

lib/gitlab/ci/templates/Security/Coverage-Fuzzing.gitlab-ci.yml

@@ -11,6 +11,14 @@ variables:
   COVFUZZ_URL_PREFIX: "https://gitlab.com/gitlab-org/security-products/analyzers/gitlab-cov-fuzz/-/raw"
 
 
+coverage_fuzzing_unlicensed:
+  stage: test
+  allow_failure: true
+  rules:
+    - if: $GITLAB_FEATURES !~ /\bcoverage_fuzzing\b/ && $COVFUZZ_DISABLED == null
+  script:
+    - echo "ERROR Your GitLab project is missing licensing for Coverage Fuzzing" && exit 1
+
 .fuzz_base:
   stage: fuzz
   allow_failure: true