Fix spec failures

lib/gitlab/kubernetes/deployment.rb

@@ -14,7 +14,7 @@ module Gitlab
       end
 
       def track
-        labels.fetch('track') || 'stable'
+        labels.fetch('track', nil) || 'stable'
       end
 
       def stable?

spec/lib/gitlab/kubernetes/deployment_spec.rb

@@ -107,7 +107,7 @@ describe Gitlab::Kubernetes::Deployment do
 
     context 'with track label' do
       let(:labels) { { 'track' => track } }
-      let(:params) { combine(named('foo'), generation(1, 0), instances(1, 1, 1, labels)) }
+      let(:params) { combine(named('foo', labels), generation(1, 0), instances(1, 1, 1, labels)) }
 
       context 'when marked as stable' do
         let(:track) { 'stable' }
@@ -148,7 +148,6 @@ describe Gitlab::Kubernetes::Deployment do
 
   def instances(replicas = 4, available = 1, updated = 2, labels = {})
     combine(
-      named('foo', labels),
       make('spec', 'replicas' => replicas),
       make('status', 'availableReplicas' => available, 'updatedReplicas' => updated),
     )

spec/support/kubernetes_helpers.rb

@@ -93,7 +93,7 @@ module KubernetesHelpers
         "labels" => {
           "app" => app,
           "track" => track
-        },
+        }.compact,
       },
       "spec" => { "replicas" => 3 },
       "status" => {