launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch",
            "type": "node",
            "request": "launch",
            "program": "${workspaceRoot}/node_modules/gulp/bin/gulp.js",
            "stopOnEntry": true,
            "args": ["test"],
            "cwd": "${workspaceRoot}",
            "preLaunchTask": null,
            "runtimeExecutable": null,
            "runtimeArgs": [
                "--nolazy"
            ],
            "env": {
                "NODE_ENV": "development"
            },
            "console": "integratedTerminal",
            "sourceMaps": true,
            "outFiles": []
        },
        {
            "name": "Attach",
            "type": "node",
            "request": "attach",
            "port": 5858,
            "address": "localhost",
            "restart": false,
            "sourceMaps": false,
            "outFiles": [],
            "localRoot": "${workspaceRoot}",
            "remoteRoot": null
        },
        {
            "name": "Attach to Process",
            "type": "node",
            "request": "attach",
            "processId": "${command.PickProcess}",
            "port": 5858,
            "sourceMaps": false,
            "outFiles": []
        },
        		{
			// Name of configuration; appears in the launch configuration drop down menu.
			"name": "Run mocha",
			// Type of configuration. Possible values: "node", "mono".
			"type": "node",
			// Workspace relative or absolute path to the program.
			"program": "${workspaceRoot}/src/node_modules/mocha/bin/_mocha",
			// Automatically stop program after launch.
			"stopOnEntry": true,
			// Command line arguments passed to the program.
			"args": ["test/"],
			// Workspace relative or absolute path to the working directory of the program being debugged. Default is the current workspace.
			"cwd": ".",
			// Workspace relative or absolute path to the runtime executable to be used. Default is the runtime executable on the PATH.
			"runtimeExecutable": null,
			// Environment variables passed to the program.
			"env": { "NODE_ENV": "production"}
		}
    ]
}