vscode/extensions/vscode-api-tests/.vscode/launch.json

// A launch configuration that compiles the extension and then opens it inside a new window
{
	"version": "0.1.0",
	"configurations": [
		{
			"name": "Launch Tests",
			"type": "extensionHost",
			"request": "launch",
			"args": [
				"${workspaceFolder}/../../",
				"${workspaceFolder}/testWorkspace",
				"--extensionDevelopmentPath=${workspaceFolder}",
				"--extensionTestsPath=${workspaceFolder}/out"
			],
			"outFiles": [
				"${workspaceFolder}/out/**/*.js"
			],
			"preLaunchTask": "npm"
		}
	]
}