Cert manager model spec and email presence validation

app/models/clusters/applications/cert_manager.rb

@@ -14,6 +14,8 @@ module Clusters
 
       default_value_for :version, VERSION
 
+      validates :hostname, presence: true
+
       def chart
         'stable/cert-manager'
       end

spec/models/clusters/applications/cert_manager_spec.rb

+require 'rails_helper'
+
+describe Clusters::Applications::CertManager do
+  let(:cert_manager) { create(:clusters_applications_cert_managers) }
+
+  include_examples 'cluster application core specs', :clusters_applications_cert_managers
+
+  describe '#make_installing!' do
+    before do
+      application.make_installing!
+    end
+
+    context 'application install previously errored with older version' do
+      let(:application) { create(:clusters_applications_cert_managers, :scheduled, version: 'v0.4.0') }
+
+      it 'updates the application version' do
+        expect(application.reload.version).to eq('v0.5.0')
+      end
+    end
+  end
+
+  describe '#install_command' do
+    let(:cluster_issuer_file) { {:"cluster_issuer.yaml" => "---\napiVersion: certmanager.k8s.io/v1alpha1\nkind: ClusterIssuer\nmetadata:\n  name: letsencrypt-prod\nspec:\n  acme:\n    server: https://acme-v02.api.letsencrypt.org/directory\n    email: admin@example.com\n    privateKeySecretRef:\n      name: letsencrypt-prod\n    http01: {}\n"} }
+    subject { cert_manager.install_command }
+
+    it { is_expected.to be_an_instance_of(Gitlab::Kubernetes::Helm::InstallCommand) }
+
+    it 'should be initialized with cert_manager arguments' do
+      expect(subject.name).to eq('certmanager')
+      expect(subject.chart).to eq('stable/cert-manager')
+      expect(subject.version).to eq('v0.5.0')
+      expect(subject).not_to be_rbac
+      expect(subject.files).to eq(cert_manager.files.merge(cluster_issuer_file))
+      expect(subject.postinstall).to eq(['/usr/bin/kubectl create -f /data/helm/certmanager/config/cluster_issuer.yaml'])
+    end
+
+    context 'for a specific user' do
+      before do
+        cert_manager.email = 'abc@xyz.com'
+        cluster_issuer_file[:'cluster_issuer.yaml'].gsub! 'admin@example.com', 'abc@xyz.com'
+      end
+
+      it 'should use his/her email to register issuer with certificate provider' do
+        expect(subject.files).to eq(cert_manager.files.merge(cluster_issuer_file))
+      end  
+    end
+
+    context 'on a rbac enabled cluster' do
+      before do
+        cert_manager.cluster.platform_kubernetes.rbac!
+      end
+
+      it { is_expected.to be_rbac }
+    end
+
+    context 'application failed to install previously' do
+      let(:cert_manager) { create(:clusters_applications_cert_managers, :errored, version: '0.0.1') }
+
+      it 'should be initialized with the locked version' do
+        expect(subject.version).to eq('v0.5.0')
+      end
+    end
+  end
+
+  describe '#files' do
+    let(:application) { cert_manager }
+    let(:values) { subject[:'values.yaml'] }
+
+    subject { application.files }
+
+    it 'should include cert_manager specific keys in the values.yaml file' do
+      expect(values).to include('ingressShim')
+    end
+  end
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:email) }
+  end
+end