1. In go project

- Export port 41000 for debugging.

- Install dlv: `go install github.com/go-delve/delve/cmd/dlv@latest`
- Restart service if it is running
- Run dlv command:
dlv test --listen :41000 --api-version 2 --headless=true {path/to/test/file} -- -test.v -test.parallel=1 -test.count=1 -test.run={test name pattern}

The part after -- is what you want to pass into go test command.

- Set breakpoint in vscode

2. In Vscode

  • Install Go extension for vscode

  • Install dlv for vscode: Press Cmd + Shift + P → Choose Go: Install/Update Tools → Choose dlv@latest

  • Set .vscode/launch.json file:

// .vscode/launch.json
{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "Debug unit test",
			"type": "go",
			"request": "attach",
			"mode": "remote",
			"remotePath": "",
			"port":41000,
			"host":"localhost",
			"showLog": true,
			"trace": "log",
			"logOutput": "rpc"
		}
	]
}

  • Set breakpoint within vscode

  • Run debug within vscode

Note: After the test is finished, the dlv test process will be stopped immediately, so you need to start again for another debug