Add build prerequisite for Kubernetes namespaces

Builds that have deployments require Kubernetes resources
to be created before the build can be deployed. These
resources are no longer created when the cluster is
created, which allows us to only create the resources
required by each specific build.

1 files changed, 72 insertions, 0 deletions

diff --git a/spec/lib/gitlab/ci/build/prerequisite/kubernetes_namespace_spec.rb b/spec/lib/gitlab/ci/build/prerequisite/kubernetes_namespace_spec.rb
new file mode 100644
index 00000000000..6f6e4abc0c8
--- /dev/null
+++ b/spec/lib/gitlab/ci/build/prerequisite/kubernetes_namespace_spec.rb
@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Ci::Build::Prerequisite::KubernetesNamespace do
+  let(:build) { create(:ci_build) }
+
+  describe '#unmet?' do
+    subject { described_class.new(build).unmet? }
+
+    context 'build has no deployment' do
+      before do
+        expect(build.deployment).to be_nil
+      end
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'build has a deployment, and no existing kubernetes namespace' do
+      let!(:deployment) { create(:deployment, deployable: build) }
+      let!(:cluster) { create(:cluster, projects: [build.project]) }
+
+      before do
+        expect(build.project.kubernetes_namespaces).to be_empty
+      end
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'build has a deployment and kubernetes namespaces' do
+      let!(:deployment) { create(:deployment, deployable: build) }
+      let!(:cluster) { create(:cluster, projects: [build.project]) }
+      let!(:kubernetes_namespace) { create(:cluster_kubernetes_namespace, cluster: cluster) }
+
+      it { is_expected.to be_falsey }
+    end
+  end
+
+  describe '#complete!' do
+    let(:cluster) { create(:cluster, projects: [build.project]) }
+    let(:service) { double(execute: true) }
+
+    subject { described_class.new(build).complete! }
+
+    context 'completion is required' do
+      let!(:deployment) { create(:deployment, deployable: build) }
+
+      it 'creates a kubernetes namespace' do
+        expect(Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService)
+          .to receive(:new)
+          .with(cluster: cluster, kubernetes_namespace: instance_of(Clusters::KubernetesNamespace))
+          .and_return(service)
+
+        expect(service).to receive(:execute).once
+
+        subject
+      end
+    end
+
+    context 'completion is not required' do
+      before do
+        expect(build.deployment).to be_nil
+      end
+
+      it 'does not create a namespace' do
+        expect(Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService).not_to receive(:new)
+
+        subject
+      end
+    end
+  end
+end