Debugging Go unit tests with Delve in VS Code

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch test function",
            "type": "go",
            "request": "launch",
            "mode": "test",
            "program": "${workspaceFolder}/bootstrap/kubeadm/internal/controllers",
            "args": [
                "-test.run",
                "TestIgnitionBootstrapData"
            ],
            "env": {
                "KUBEBUILDER_ASSETS": "/home/me/.local/share/kubebuilder-envtest/k8s/1.22.0-linux-amd64"
            },
        }
    ]
}