1 files changed, 74 insertions, 1 deletions
diff --git a/spec/models/concerns/deployment_platform_spec.rb b/spec/models/concerns/deployment_platform_spec.rb
index 7bb89fe41dc..19ab4382b53 100644
--- a/spec/models/concerns/deployment_platform_spec.rb
+++ b/spec/models/concerns/deployment_platform_spec.rb
@@ -43,13 +43,86 @@ describe DeploymentPlatform do
       it { is_expected.to be_nil }
     end
 
-    context 'when user configured kubernetes from CI/CD > Clusters' do
+    context 'when project has configured kubernetes from CI/CD > Clusters' do
       let!(:cluster) { create(:cluster, :provided_by_gcp, projects: [project]) }
       let(:platform_kubernetes) { cluster.platform_kubernetes }
 
       it 'returns the Kubernetes platform' do
         expect(subject).to eq(platform_kubernetes)
       end
+
+      context 'with a group level kubernetes cluster' do
+        let(:group_cluster) { create(:cluster, :provided_by_gcp, :group) }
+
+        before do
+          project.update!(group: group_cluster.group)
+        end
+
+        it 'returns the Kubernetes platform from the project cluster' do
+          expect(subject).to eq(platform_kubernetes)
+        end
+      end
+    end
+
+    context 'when group has configured kubernetes cluster' do
+      let!(:group_cluster) { create(:cluster, :provided_by_gcp, :group) }
+      let(:group) { group_cluster.group }
+
+      before do
+        project.update!(group: group)
+      end
+
+      it 'returns the Kubernetes platform' do
+        is_expected.to eq(group_cluster.platform_kubernetes)
+      end
+
+      context 'when child group has configured kubernetes cluster', :nested_groups do
+        let!(:child_group1_cluster) { create(:cluster, :provided_by_gcp, :group) }
+        let(:child_group1) { child_group1_cluster.group }
+
+        before do
+          project.update!(group: child_group1)
+          child_group1.update!(parent: group)
+        end
+
+        it 'returns the Kubernetes platform for the child group' do
+          is_expected.to eq(child_group1_cluster.platform_kubernetes)
+        end
+
+        context 'deeply nested group' do
+          let!(:child_group2_cluster) { create(:cluster, :provided_by_gcp, :group) }
+          let(:child_group2) { child_group2_cluster.group }
+
+          before do
+            child_group2.update!(parent: child_group1)
+            project.update!(group: child_group2)
+          end
+
+          it 'returns most nested group cluster Kubernetes platform' do
+            is_expected.to eq(child_group2_cluster.platform_kubernetes)
+          end
+
+          context 'cluster in the middle of hierarchy is disabled' do
+            before do
+              child_group2_cluster.update!(enabled: false)
+            end
+
+            it 'returns closest enabled Kubenetes platform' do
+              is_expected.to eq(child_group1_cluster.platform_kubernetes)
+            end
+          end
+        end
+      end
+
+      context 'feature flag disabled' do
+        before do
+          stub_feature_flags(group_clusters: false)
+        end
+
+        it 'returns nil' do
+          is_expected.to be_nil
+        end
+      end
     end
 
     context 'when user configured kubernetes integration from project services' do