A minimal version that creates a temporary cluster without affecting ~/.kube/config, provide configured kube::Client, and clean up when it's dropped can be done using k3d easily.

https://gist.github.com/kazk/3419b8dd0468e1640c4575c638ef590b

#[tokio::test]
async fn test_integration() {
    let test_env = TestEnv::new();
    let client = test_env.client().await;

    let pods: Api<Pod> = Api::default_namespaced(client);
    let _pod = pods.get("example").await.unwrap();
}
// Multiple tests each creating a cluster can run in parallel too

running 1 test
INFO[0000] Prep: Network                                
INFO[0000] Created network 'k3d-c308jevs3ok61t88c0dg' (832b6396535a5538cb87bf2f29a47849011dc1d80e13e567c3c06bd23ede4cdf) 
INFO[0000] Created volume 'k3d-c308jevs3ok61t88c0dg-images' 
INFO[0001] Creating node 'k3d-c308jevs3ok61t88c0dg-server-0' 
INFO[0001] Creating LoadBalancer 'k3d-c308jevs3ok61t88c0dg-serverlb' 
INFO[0001] Starting cluster 'c308jevs3ok61t88c0dg'      
INFO[0001] Starting servers...                          
INFO[0001] Starting Node 'k3d-c308jevs3ok61t88c0dg-server-0' 
INFO[0009] Starting agents...                           
INFO[0009] Starting helpers...                          
INFO[0009] Starting Node 'k3d-c308jevs3ok61t88c0dg-serverlb' 
INFO[0010] Cluster 'c308jevs3ok61t88c0dg' created successfully! 
INFO[0010] You can now use it like this:                
export KUBECONFIG=$(k3d kubeconfig write c308jevs3ok61t88c0dg)
kubectl cluster-info

thread 'test_integration' panicked at 'called `Result::unwrap()` on an `Err` value: Api(ErrorResponse { status: "Failure", message: "pods \"example\" not found", reason: "NotFound", code: 404 })', tests/integration_test.rs:13:42

Deleting k3d cluster c308jevs3ok61t88c0dg...
INFO[0000] Deleting cluster 'c308jevs3ok61t88c0dg'      
INFO[0000] Deleted k3d-c308jevs3ok61t88c0dg-serverlb    
INFO[0000] Deleted k3d-c308jevs3ok61t88c0dg-server-0    
INFO[0000] Deleting cluster network 'k3d-c308jevs3ok61t88c0dg' 
INFO[0000] Deleting image volume 'k3d-c308jevs3ok61t88c0dg-images' 
INFO[0000] Removing cluster details from default kubeconfig... 
INFO[0000] Removing standalone kubeconfig file (if there is one)... 
INFO[0000] Successfully deleted cluster c308jevs3ok61t88c0dg! 
test test_integration ... FAILED

failures:

failures:
    test_integration

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 12.11s

I think we can extend this (make it configurable, load CRDs, assertion helpers, etc.) to get a pretty good test helper.

Uh oh!

Envtest #382

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