The following environment variables should be set:

1. E2E_NAMESPACE is the namespace where the tests should be run.
2. OPERATOR_ID is set so that all stacks are only managed by the controller being currently tested.
3. KUBECONFIG with the path to the kubeconfig file

To run the tests run the command:

go test -parallel $NUM_PARALLEL github.com/zalando-incubator/es-operator/cmd/e2e

Over here $NUM_PARALLEL can be set to a sufficiently high value which indicates how many of the parallel type tests can be run concurrently.