Converted YML to JSON and fixed test_page option (test_file was wrong). Your routes may vary.

testem-browserstack-qunit-example.json

{
  "test_page": "test.html",
  "port": 7357,

  "routes": {
    "/js": "../../../js"
  },

  "framework": "qunit",
  "on_start": {
    "command": "browserstack tunnel localhost:7357",
    "wait_for_text": "You can now access your local server(s) in our remote browser"
  },

  "launchers": {

    "bs_opera": {
      "command": "browserstack launch --attach opera:12.11 http://localhost:7357",
      "protocol": "browser"
    },

    "bs_safari_5": {
      "command": "browserstack launch --attach safari:5.0 http://localhost:7357",
      "protocol": "browser"
    },
    "bs_safari_51": {
      "command": "browserstack launch --attach safari:5.1 http://localhost:7357",
      "protocol": "browser"
    },
    "bs_safari_6": {
      "command": "browserstack launch --attach safari:6.0 http://localhost:7357",
      "protocol": "browser"
    },

    "bs_chrome_25": {
      "command": "browserstack launch --attach chrome:25.0 http://localhost:7357",
      "protocol": "browser"
    },

    "bs_ie_7": {
      "command": "browserstack launch --attach ie:7.0 http://localhost:7357",
      "protocol": "browser"
    },
    "bs_ie_8": {
      "command": "browserstack launch --attach ie:8.0 http://localhost:7357",
      "protocol": "browser"
    },
    "bs_ie_9": {
      "command": "browserstack launch --attach ie:9.0 http://localhost:7357",
      "protocol": "browser"
    },
    "bs_ie_10": {
      "command": "browserstack launch --attach ie:10.0 http://localhost:7357",
      "protocol": "browser"
    },

    "bs_firefox": {
      "command": "browserstack launch --attach firefox:16.0 http://localhost:7357",
      "protocol": "browser"
    },
    "bs_iphone_3GS": {
      "command": "browserstack launch --attach \"iPhone 3GS\" http://localhost:7357",
      "protocol": "browser"
    },

    "bs_ipad_32": {
      "command": "browserstack launch --attach iPad http://localhost:7357",
      "protocol": "browser"
    },
    "bs_ipad_6": {
      "command": "browserstack launch --attach \"iPad 3rd (6.0)\" http://localhost:7357",
      "protocol": "browser"
    },
    "bs_iphone_5": {
      "command": "browserstack launch --attach \"iPhone 5\" http://localhost:7357",
      "protocol": "browser"
    },

    "bs_samsung_tab": {
      "command": "browserstack launch --attach \"Samsung Galaxy Tab 10.1\" http://localhost:7357",
      "protocol": "browser"
    },
    "bs_google_nexus": {
      "command": "browserstack launch --attach \"Google Nexus 7\" http://localhost:7357",
      "protocol": "browser"
    },
    "bs_htc_wildfire": {
      "command": "browserstack launch --attach \"HTC Wildfire\" http://localhost:7357",
      "protocol": "browser"
    }
  },
  "launch_in_dev": [
    "bs_ie_10"
  ],
  "launch_in_ci": [
    "bs_opera",
    "bs_firefox",
    "bs_safari_6",
    "bs_ie_10",
    "bs_iphone_5"
  ]

}