Try to run tests with minikube on travis

Author: LEDfan

.travis.yml

@@ -1,9 +1,43 @@
-language: java
+# loosely based on https://github.com/lilic/travis-minikube
 sudo: required
+dist: xenial
+language: java
+
+env:
+  global:
+    - CHANGE_MINIKUBE_NONE_USER=true
+    - MINIKUBE_WANTUPDATENOTIFICATION=false
+    - MINIKUBE_WANTREPORTERRORPROMPT=false
+    - MINIKUBE_HOME=$HOME
+    - CHANGE_MINIKUBE_NONE_USER=true
+    - KUBECONFIG=$HOME/.kube/config
+
 cache:
   directories:
   - "$HOME/.cache"
+
 services:
   - docker
+
 before_install:
-- docker pull openanalytics/shinyproxy-demo
+- docker pull openanalytics/shinyproxy-demo
+- sudo apt-get -qq -y install conntrack
+
+before_script:
+# Download kubectl, which is a requirement for using minikube.
+- curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/v1.18.9/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
+# Download minikube.
+- curl -Lo minikube https://storage.googleapis.com/minikube/releases/v1.8.9/minikube-linux-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/
+- mkdir -p $HOME/.kube $HOME/.minikube
+- touch $KUBECONFIG
+- sudo minikube start --profile=minikube --vm-driver=none --kubernetes-version=v1.18.9
+- minikube update-context --profile=minikube
+- "sudo chown -R travis: /home/travis/.minikube/"
+- eval "$(minikube docker-env --profile=minikube)" && export DOCKER_CLI='docker'
+
+
+script:
+# Following is just to demo that the kubernetes cluster works.
+- kubectl cluster-info
+# Wait for kube-dns to be ready.
+- JSONPATH='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}'; until kubectl -n kube-system get pods -lk8s-app=kube-dns -o jsonpath="$JSONPATH" 2>&1 | grep -q "Ready=True"; do sleep 1;echo "waiting for kube-dns to be available"; kubectl get pods --all-namespaces; done