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Install with packer:

use {
  "cwebster2/mocha-runner.nvim",
  config = function() require("mocha-runner").setup(options) end,
}

Where options is a table that accepts the following keys

options = {
  mocha_args = "",
  mocha_bin = "mocha",
  pass_message = " ✓ Test Passed",
  fail_message = " Test Failed",
}

You can customize the look of the pass and fail messages with the highlight groups MochaRunnerSuccess and MochaRunnerFailure.

Run :MochaRunner in a buffer that has mocha tests in it, and it will run them and annotate their pass/fail status and update it on every write of that file.