I'm not sure what is the best way but I used jest and liked the result.

how did you use jest with clojurescript?

can you give an example file?

I have an example project, there is some setup necessary. https://github.com/mynomoto/reagent-expo/tree/jest-test

how do you run the tests?

It is on the readme.

shadow-cljs watch test?

That will build the test files. You need to run yarn jest on another terminal to run jest.

i don’t use yarn

i use npm

npm run jest

how does it know which files contain the tests?

how does jest know which directory to look at?

https://github.com/mynomoto/reagent-expo/blob/jest-test/package.json#L32

https://github.com/mynomoto/reagent-expo/blob/jest-test/shadow-cljs.edn#L19

so in my own project i have to add this in my package.json?

the testMatch keyword?

Sorry for the ignorance, I haven’t used jest

There are many ways to do it. That project is a working example, if you follow it you should get things working.

You can see the commits I did to add jest. Those will show you the necessary changes.

where are you based?

what is the snapshotResolver?

I’m getting the following error when running shadow-cljs watch test

-- Spec failed --------------------  {:target :npm-module, :output-dir “test-out”, :build-id :test} should contain key: :entries | key   | spec      | |==========+=================| | :entries | (coll-of    | |     | simple-symbol? | |     | :distinct   | |     | true      | |     | :min-count   | |     | 1       | |     | :kind     | |     | vector?)    | -- Relevant specs ------- :shadow.build.targets.npm-module/target:  (clojure.spec.alpha/keys   :req-un   [:shadow.build.targets.shared/output-dir   :shadow.build.targets.npm-module/entries]   :opt-un   [:shadow.build.targets.npm-module/runtime   :shadow.build.targets.shared/devtools]) :shadow.build.config/build+target:  (clojure.spec.alpha/and   :shadow.build.config/build   (clojure.spec.alpha/multi-spec   shadow.build.config/target-spec   :target)) ------------------------- Detected 1 error

I live in Brazil. That are for view snapshots. Google for jest snapshots to see the use case for those.

That is probably a shadow breaking change. Not sure about what goes in that key and I'm afk right now.

Actually an empty vector on :entries should work.

I’m getting the following error after adding the []

Invalid configuration -- Spec failed --------------------  {:target ...,   :output-dir ...,   :entries [],       ^^   :build-id ...} should satisfy  (<= 1 (count %) Integer/MAX_VALUE) -- Relevant specs ------- :shadow.build.targets.npm-module/entries:  (clojure.spec.alpha/coll-of   clojure.core/simple-symbol?   :distinct   true   :min-count   1   :kind   clojure.core/vector?) :shadow.build.targets.npm-module/target:  (clojure.spec.alpha/keys   :req-un   [:shadow.build.targets.shared/output-dir   :shadow.build.targets.npm-module/entries]   :opt-un   [:shadow.build.targets.npm-module/runtime   :shadow.build.targets.shared/devtools]) :shadow.build.config/build+target:  (clojure.spec.alpha/and   :shadow.build.config/build   (clojure.spec.alpha/multi-spec   shadow.build.config/target-spec   :target)) ------------------------- Detected 1 error

I have the following in my package.json

“jest”: { “preset”: “react-native”, “testPathIgnorePatterns”: [ “/node_modules/“, “/.shadow-cljs/” ], “testMatch”: [ “/test-out//*_test.js” ], “snapshotResolver”: “<rootDir>/customSnapshotResolver.js” }

but when I run npm run jest, I get the following error:

npm ERR! missing script: jest npm ERR!  npm ERR! Did you mean this? npm ERR!   test npm ERR! A complete log of this run can be found in: npm ERR!   /Users/prikshetsharma/.npm/logs/2021-01-17T2013_25_770Z-debug.log prikshetsharma@vpn13-222 Humboi % npm run jest npm ERR! missing script: jest npm ERR!  npm ERR! Did you mean this? npm ERR!   test npm ERR! A complete log of this run can be found in: npm ERR!   /Users/prikshetsharma/.npm/logs/2021-01-17T2014_42_077Z-debug.log

Oh, on npm it is npm run test

that gives the following error:

> [email protected] test /Users/prikshetsharma/Desktop/Humboi > jest sh: jest: command not found npm ERR! code ELIFECYCLE npm ERR! syscall spawn npm ERR! file sh npm ERR! errno ENOENT npm ERR! [email protected] test: jest npm ERR! spawn ENOENT npm ERR!  npm ERR! Failed at the [email protected] test script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR!   /Users/prikshetsharma/.npm/logs/2021-01-18T1422_50_869Z-debug.log

and the log file has the following content:

0 info it worked if it ends with ok 1 verbose cli [ ‘/usr/local/bin/node’, ‘/usr/local/bin/npm’, ‘run’, ‘test’ ] 2 info using [email protected] 3 info using [email protected] 4 verbose run-script [ ‘pretest’, ‘test’, ‘posttest’ ] 5 info lifecycle [email protected]~pretest: [email protected] 6 info lifecycle [email protected]~test: [email protected] 7 verbose lifecycle [email protected]~test: unsafe-perm in lifecycle true 8 verbose lifecycle [email protected]test: PATH: /usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/Users/prikshetsharma/Desktop/Humboi/node_modules/.bin:/opt/X11/bin:/Users/prikshetsharma/.rbenv/shims:/usr/local/opt/ruby/bin:/usr/local/opt/ruby/lib/ruby/gems/2.7.0/bin:/usr/local/opt/ruby/bin:/usr/local/bin:/Users/prikshetsharma/Library/Android/sdk/platform-tools:/Users/prikshetsharma/Library/Android/sdk/emulator:/usr/local/opt/ruby/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/local/share/dotnet:/opt/X11/bin:/.dotnet/tools:/Library/Apple/usr/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Users/prikshetsharma/.rvm/bin:/usr/local/bin:/Users/prikshetsharma/Library/Android/sdk/emulator:/Users/prikshetsharma/Library/Android/sdk/tools:/Users/prikshetsharma/Library/Android/sdk/tools/bin:/Users/prikshetsharma/Library/Android/sdk/platform-tools 9 verbose lifecycle [email protected]~test: CWD: /Users/prikshetsharma/Desktop/Humboi 10 silly lifecycle [email protected]~test: Args: [ ‘-c’, ‘jest’ ] 11 info lifecycle [email protected]~test: Failed to exec test script 12 verbose stack Error: [email protected] test: jest 12 verbose stack spawn ENOENT 12 verbose stack at ChildProcess.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:48:18) 12 verbose stack at ChildProcess.emit (events.js:315:20) 12 verbose stack at maybeClose (internal/child_process.js:1048:16) 12 verbose stack at Process.ChildProcess.handle.onexit (internal/childprocess.js:288:5) 13 verbose pkgid [email protected] 14 verbose cwd /Users/prikshetsharma/Desktop/Humboi 15 verbose Darwin 20.2.0 16 verbose argv “/usr/local/bin/node” “/usr/local/bin/npm” “run” “test” 17 verbose node v14.15.1 18 verbose npm v6.14.8 19 error code ELIFECYCLE 20 error syscall spawn 21 error file sh 22 error errno ENOENT 23 error [email protected] test: jest 23 error spawn ENOENT 24 error Failed at the [email protected] test script. 24 error This is probably not a problem with npm. There is likely additional logging output above. 25 verbose exit [ 1, true ]

Did you add the dependencies on package.json? And run npm install after adding the dependencies?

yes I have already run npm install

but am still getting the error

how to fix it?

Is the project on github? Or can you paste your package.json?

I think this is the lock one. I want the one used for configuration.

{ "name": "Humboi", "version": "0.0.1", "private": true, "scripts": { "android": "react-native run-android", "ios": "react-native run-ios", "start": "react-native start", "test": "jest", "lint": "eslint ." }, "dependencies": { "@react-native-async-storage/async-storage": "^1.13.2", "@react-native-community/cameraroll": "^4.0.1", "@react-native-community/masked-view": "^0.1.10", "@react-navigation/bottom-tabs": "^5.11.3", "@react-navigation/native": "^5.9.0", "@unimodules/core": "^7.0.0", "create-react-class": "^15.7.0", "expo-camera": "^9.1.1", "react": "16.13.1", "react-dom": "^16.13.0", "react-native": "0.63.4", "react-native-camera": "^3.42.0", "react-native-camera-roll-picker": "^2.0.0", "react-native-elements": "^3.1.0", "react-native-gesture-handler": "^1.9.0", "react-native-google-signin": "^2.1.1", "react-native-reanimated": "^1.13.2", "react-native-safe-area-context": "^3.1.9", "react-native-screens": "^2.16.1", "react-native-vector-icons": "^7.1.0", "react-native-video": "^4.3.0" }, "devDependencies": { "@babel/core": "^7.8.4", "@babel/runtime": "^7.8.4", "@react-native-community/eslint-config": "^1.1.0", "@testing-library/react-native": "^7.1.0", "babel-jest": "^25.1.0", "eslint": "^6.5.1", "jest": "^25.1.0", "metro-react-native-babel-preset": "^0.59.0", "react-test-renderer": "16.13.1" }, "jest": { "preset": "react-native", "testPathIgnorePatterns": [ "/node_modules/", "/.shadow-cljs/" ], "testMatch": [ "/test-out//*_test.js" ], "snapshotResolver": "<rootDir>/customSnapshotResolver.js" } }

What is the output of running npm install?

npm WARN @react-native-community/[email protected] requires a peer of react-native@>=0.57 <=0.62 but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-barcode-scanner-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-camera-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-face-detector-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-file-system-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-permissions-interface@* but none is installed. You must install peer dependencies yourself. removed 9 packages and audited 1380 packages in 4.168s 14 packages are looking for funding  run npm fund for details found 4 low severity vulnerabilities  run npm audit fix to fix them, or npm audit for details prikshetsharma@vpn13-222 Humboi % npm run test > [email protected] test /Users/prikshetsharma/Desktop/Humboi > jest sh: jest: command not found npm ERR! code ELIFECYCLE npm ERR! syscall spawn npm ERR! file sh npm ERR! errno ENOENT npm ERR! [email protected] test: jest npm ERR! spawn ENOENT npm ERR!  npm ERR! Failed at the [email protected] test script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR!   /Users/prikshetsharma/.npm/logs/2021-01-18T1442_54_628Z-debug.log prikshetsharma@vpn13-222 Humboi % npm install npm WARN @react-native-community/[email protected] requires a peer of react-native@>=0.57 <=0.62 but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-barcode-scanner-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-camera-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-face-detector-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-file-system-interface@* but none is installed. You must install peer dependencies yourself. npm WARN [email protected] requires a peer of unimodules-permissions-interface@* but none is installed. You must install peer dependencies yourself. removed 9 packages and audited 1380 packages in 5.365s 14 packages are looking for funding  run npm fund for details found 4 low severity vulnerabilities  run npm audit fix to fix them, or npm audit for details

Try to run npm run test. You did not installed jest globally so running jest is not expected to work.

But npm run test gives the following:

> [email protected] test /Users/prikshetsharma/Desktop/Humboi > jest sh: jest: command not found npm ERR! code ELIFECYCLE npm ERR! syscall spawn npm ERR! file sh npm ERR! errno ENOENT npm ERR! [email protected] test: jest npm ERR! spawn ENOENT npm ERR!  npm ERR! Failed at the [email protected] test script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR!   /Users/prikshetsharma/.npm/logs/2021-01-19T0135_32_701Z-debug.log’]

You should remove the test entry on package.json scripts.

after removing and running npm run test, I get the following:

> [email protected] test /Users/prikshetsharma/Desktop/Humboi > echo ‘Error: no test specified’ Error: no test specified

Do you have tests on the project?

nope

Then that is expected. It is telling you that you have no tests.

you said remove the test from package.json

and npm run jest doesn’t work either

Here’s my package.json currently with test script removed:

{ “name”: “Humboi”, “version”: “0.0.1", “private”: true, “scripts”: { “android”: “react-native run-android”, “ios”: “react-native run-ios”, “start”: “react-native start”, “lint”: “eslint .” }, “dependencies”: { “@react-native-async-storage/async-storage”: “^1.13.2”, “@react-native-community/cameraroll”: “^4.0.1”, “@react-native-community/masked-view”: “^0.1.10”, “@react-navigation/bottom-tabs”: “^5.11.3”, “@react-navigation/native”: “^5.9.0”, “@unimodules/core”: “^7.0.0”, “@unimodules/react-native-adapter”: “^6.0.0”, “create-react-class”: “^15.7.0”, “expo-camera”: “^9.1.1”, “expo-media-library”: “^10.0.0”, “react”: “16.13.1”, “react-dom”: “^16.13.0”, “react-native”: “0.63.4”, “react-native-beautiful-video-recorder”: “^2.0.1”, “react-native-camera”: “^3.42.0”, “react-native-camera-roll-picker”: “^2.0.0”, “react-native-elements”: “^3.1.0”, “react-native-gesture-handler”: “^1.9.0”, “react-native-google-signin”: “^2.1.1”, “react-native-reanimated”: “^1.13.2”, “react-native-safe-area-context”: “^3.1.9”, “react-native-screens”: “^2.16.1”, “react-native-unimodules”: “^0.12.0”, “react-native-vector-icons”: “^7.1.0”, “react-native-video”: “^4.3.0”, “unimodules-permissions-interface”: “^5.4.0” }, “devDependencies”: { “@babel/core”: “^7.8.4", “@babel/runtime”: “^7.8.4", “@react-native-community/eslint-config”: “^1.1.0", “@testing-library/react-native”: “^7.1.0", “babel-jest”: “^25.1.0", “eslint”: “^6.5.1", “jest”: “^25.5.4", “metro-react-native-babel-preset”: “^0.59.0", “react-test-renderer”: “16.13.1" }, “jest”: { “preset”: “react-native”, “testPathIgnorePatterns”: [ “/node_modules/“, “/.shadow-cljs/” ], “testMatch”: [ “/test-out//*_test.js” ], “snapshotResolver”: “<rootDir>/customSnapshotResolver.js” } }

Now the command is working but it could not find any tests. You need some tests on the project.

I have the tests in the test/myapp/core_test.cljs directory

Did you compile the tests to javascript with shadow-cljs watch test?

yes

And you can find the compiled test on the test-out folder?

yes

but there are no test scripts for npm run test.

what test script should I add?

Jest works without a test script. The message you are receiving says that it could not find any tests.