I am fairly new to Kubernetes and I have recently exposed a service using miniKube using NodePort type. I want to test the running of my application but I dont
NodePort
As you are using minikube, the command minikube ip will return the IP you are looking for.
minikube
minikube ip
In case you are not using minikube, kubectl get nodes -o yaml will show you, amongst other data, the IP address of the node.
kubectl get nodes -o yaml