UI testing with Detox for Expo Android: Error: No instrumentation runner found on device emulator.

Expo SDK
1

I’ve been trying to get detox working with our Expo Android app and even though I made some progress, have been stuck with this error for 2-3 days:

No instrumentation runner found on device emulator-5554 for package host.exp.exponent

These are the steps that I tried:

➜ npm install -g detox-cli
➜ npm install detox --save-dev
➜ npm install mocha --save-dev
➜ npm i detox-expo-helpers --save-dev
➜ detox init -r mocha
➜ mkdir bin

➜ ls
App.js    bin                   native-base-theme  package-lock.json  __tests__
app.json  e2e                   node_modules       README.md          themes
assets    google-services.json  package.json       src

➜ mv ~/.expo/android-apk-cache/Exponent-2.11.2.apk bin/
➜ mv bin/Exponent-2.11.2.apk bin/Exponent.apk

Here is the package.json:

{
  "name": "abc",
  "version": "0.1.0",
  "private": true,
  "main": "node_modules/expo/AppEntry.js",
  "scripts": {
    "start": "exp start",
    "eject": "exp eject",
    "android": "exp android",
    "ios": "exp ios",
    "test": "node node_modules/jest/bin/jest.js --watch"
  },
  "jest": {
    "preset": "jest-expo",
    "transformIgnorePatterns": [
      "node_modules/(?!react-native|expo|react-navigation|native-base-shoutem-theme|@shoutem/theme|@shoutem/animation|@shoutem/ui|tcomb-form-native)"
    ]
  },
  "detox": {
    "configurations": {
      "android.emu.debug": {
        "binaryPath": "bin/Exponent.apk",
        "build": "npm run android",
        "type": "android.emulator",
        "name": "New_Device_2_API_26"
      }
    }
  },
  "dependencies": {
    "@expo/vector-icons": "^6.2.1",
    "bunyan": "^1.8.12",
    "expo": "^26.0.0",
    "lodash": "^4.17.5",
    "moment": "^2.20.1",
    "moment-timezone": "^0.5.25",
    "native-base": "^2.6.1",
    "react": "16.3.0-alpha.1",
    "react-native": "https://github.com/expo/react-native/archive/sdk-26.0.0.tar.gz",
    "react-native-device-info": "^0.21.5",
    "react-native-swiper": "^1.5.14",
    "react-navigation": "1.5.8",
    "rn-prompt": "^1.0.3",
    "sentry-expo": "~1.7.0"
  },
  "devDependencies": {
    "babel-plugin-module-resolver": "^3.0.0",
    "detox": "^12.11.1",
    "detox-expo-helpers": "^0.6.0",
    "expo-detox-hook": "^1.0.10",
    "jest-expo": "^22.0.0",
    "mocha": "^6.1.4",
    "react-addons-test-utils": "^15.6.2",
    "react-dom": "^16.2.0",
    "react-native-scripts": "1.7.0",
    "react-test-renderer": "16.0.0-beta.5"
  }
}

After all of this, while trying detox test for the first time, I was met with the error:

Error: app binary not found at '../android/app/build/outputs/apk/debug/app-debug.apk', did you build it?

As a quick fix, just to get the initial tests running so that I can validate that this entire setup works, I went ahead and edited the ../node_modules/detox/src/devices/android/APKPath.js directly and hardcoded the path to the binary:

const testApkPath = '../bin/Exponent.apk';

That specific error was fixed for the time being after that. However, the next time running detox test started giving me the error of this post:

➜ detox test
detox[13573] INFO:  [test.js] node_modules/.bin/mocha --opts e2e/mocha.opts --configuration android.emu.debug --grep :ios: --invert --artifacts-location "artifacts/android.emu.debug.2019-06-19 13-31-01Z" "e2e"


detox[13586] INFO:  [DetoxServer.js] server listening on localhost:45523...
detox[13586] ERROR: [index.js/DETOX_INIT_ERROR] 
 Error: No instrumentation runner found on device emulator-5554 for package host.exp.exponent
    at ADB.getInstrumentationRunner (../node_modules/detox/src/devices/android/ADB.js:253:13)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
  1) "before all" hook in "{root}"

  0 passing (38s)
  1 failing

  1) "before all" hook in "{root}":
     Error: No instrumentation runner found on device emulator-5554 for package host.exp.exponent
      at ADB.getInstrumentationRunner (node_modules/detox/src/devices/android/ADB.js:253:13)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)


detox[13573] ERROR: [cli.js] Error: Command failed: node_modules/.bin/mocha --opts e2e/mocha.opts --configuration android.emu.debug --grep :ios: --invert --artifacts-location "artifacts/android.emu.debug.2019-06-19 13-31-01Z" "e2e"

I am not an expert, but after reading around, something tells me that this info also might be relevant:

➜ adb shell pm list instrumentation
instrumentation:com.android.emulator.smoketests/android.support.test.runner.AndroidJUnitRunner (target=com.android.emulator.smoketests)
instrumentation:com.android.smoketest.tests/com.android.smoketest.SmokeTestRunner (target=com.android.smoketest)
instrumentation:com.example.android.apis/.app.LocalSampleInstrumentation (target=com.example.android.apis)
instrumentation:org.chromium.webview_shell/.WebViewLayoutTestRunner (target=org.chromium.webview_shell)

Please let me know if you need any more info in order to help. Any pointers or help would be greatly appreciated. Thank you so much! :slight_smile:

2

I’m having the same problem and will appreciate any ideas how to proceed.
(commenting it only to extend the period before the issue is automatically closed)

3

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