Add some basic unit tests for the following files: (#1050)

* Add some basic unit tests for cluster, kube-auth-proxy, and kubeconfig-manager

- src/main/cluster.ts
- src/main/kube-auth-proxy.ts
- src/main/kubeconfig-manager.ts

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/main/cluster.ts

@@ -93,7 +93,7 @@ export class Cluster implements ClusterModel {
   async init(port: number) {
     try {
       this.contextHandler = new ContextHandler(this);
-      this.kubeconfigManager = new KubeconfigManager(this, this.contextHandler, port);
+      this.kubeconfigManager = await KubeconfigManager.create(this, this.contextHandler, port);
       this.kubeProxyUrl = `http://localhost:${port}${apiKubePrefix}`;
       this.initialized = true;
       logger.info(`[CLUSTER]: "${this.contextName}" init success`, {