Merge pull request #669 from lilic/test-against-1.19

Test against 1.18 and 1.19

README.md

@@ -96,7 +96,7 @@ The following versions are supported and work as we test against these versions
 | `release-0.3`         | ✔               | ✔               | ✔               | ✔               | ✗               | ✗               |
 | `release-0.4`         | ✗               | ✗               | ✔ (v1.16.5+)    | ✔               | ✗               | ✗               |
 | `release-0.5`         | ✗               | ✗               | ✗               | ✗               | ✔               | ✗               |
-| `release-0.6`         | ✗               | ✗               | ✗               | ✗               | ✔               | ✗               |
+| `release-0.6`         | ✗               | ✗               | ✗               | ✗               | ✔               | ✔               |
 | `HEAD`                | ✗               | ✗               | ✗               | ✗               | ✔               | ✗               |
 
 Note: Due to [two](https://github.com/kubernetes/kubernetes/issues/83778) [bugs](https://github.com/kubernetes/kubernetes/issues/86359) in Kubernetes v1.16.1, and prior to Kubernetes v1.16.5 the kube-prometheus release-0.4 branch only supports v1.16.5 and higher.  The `extension-apiserver-authentication-reader` role in the kube-system namespace can be manually edited to include list and watch permissions in order to workaround the second issue with Kubernetes v1.16.2 through v1.16.4.

tests/e2e/travis-e2e.sh

@@ -13,7 +13,10 @@ chmod +x kubectl
 curl -Lo kind https://github.com/kubernetes-sigs/kind/releases/download/v0.7.0/kind-linux-amd64
 chmod +x kind
 
-./kind create cluster --image=kindest/node:v1.18.0
+run_e2e_tests() {
+    cluster_version=$1
+
+    ./kind create cluster --image=kindest/node:$cluster_version
     # the default kube config location used by kind
     export KUBECONFIG="${HOME}/.kube/config"
     
@@ -27,3 +30,13 @@ until ./kubectl get servicemonitors --all-namespaces ; do date; sleep 1; echo ""
     ./kubectl create -f manifests/
 
     make test-e2e
+
+    ./kind delete cluster
+}
+
+cluster_compatible_versions=("v1.18.8" "v1.19.0")
+
+for cluster_version in "${cluster_compatible_versions[@]}"
+do
+    run_e2e_tests $cluster_version
+done