VS Code debugger configuration for debugging a single test of the currently open test file.

launch.json

{
	// Use IntelliSense to learn about possible attributes.
	// Hover to view descriptions of existing attributes.
	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
	"version": "0.2.0",
	"configurations": [
		{
			"name": "Test Current File",
			"type": "go",
			"request": "launch",
			"mode": "test",
			"program": "${workspaceFolder}/${relativeFileDirname}",
			"args": [
				"-test.run",
				"Test_Bidder_size_ope/004"
			]
		}
	]
}

go test ./... -run Test_Bidder_size_ope/004