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": [
    {
      "type": "node",
      "request": "launch",
      "name": "Test suite",
      "program": "${workspaceFolder}/node_modules/.bin/_mocha",
      "args": ["--timeout", "9999999999"],
      "skipFiles": [
        "<node_internals>/**" // Prevent stepping through async_hooks.js et al.
      ],
      "internalConsoleOptions": "openOnSessionStart",
      "console": "internalConsole",
      "outputCapture": "std"
    },
    {
      "type": "node",
      "request": "launch",
      "name": "Mocha current file",
      "cwd": "${workspaceRoot}",
      "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/mocha",
      "windows": {
        "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/mocha.cmd"
      },
      "runtimeArgs": [
        "--timeout",
        "999999",
        "--colors",
        "--recursive",
        "${file}"
      ],
      "skipFiles": [
        "<node_internals>/**" // Prevent stepping through async_hooks.js et al.
      ],
      "internalConsoleOptions": "openOnSessionStart",
      "console": "internalConsole",
      "outputCapture": "std"
    }
  ]
}