Jest not found while running JEST in docker container - node.js

Question

I have created below simple Dockerfile:
FROM node:16.7.0
WORKDIR /app
COPY . .
RUN npm install
# ENTRYPOINT [ "npm" ]
CMD ["sh", "-c", "tail -f /dev/null"]
I have added a cmd line with "tail -f /dev/null" to check exactly what's the issue if I issue npm test inside the container.
As soon as I run npm test inside the container --> It throws me below error
# npm test
> docker-jest#1.0.0 test
> jest --verbose
sh: 1: jest: not found
my package.json
{
"name": "docker-jest",
"version": "1.0.0",
"description": "Package for Jest",
"scripts": {
"test": "jest --verbose"
},
"Dependencies": {
"#babel/node": "*",
"#babel/core": "*",
"#babel/preset-env": "*",
"babel-jest": "*",
"jest": "*"
},
"license": "ISC"
}
sum.js
function sum(a, b) {
return a + b;
}
module.exports = sum;
sum.test.js
const sum = require('./sum');
test('adds 1 + 2 to equal 3', () => {
expect(sum(1, 2)).toBe(3);
});
Even if I disable CMD and enable ENTRYPOINT and after the build, if I issue:
docker run -it <imagename> test
It throws me the same error, I see the npm install is installing but can't find the jest # /usr/local/lib/node_modules/ as I see the node modules are deployed in location/usr/local/lib/node_modules/ inside the container, and if I issue jest it says jest not found. If I, run the same without the container it works fine. I mean just in the command line after running npm install and then npm run test.
Can anyone assist me with why I'm getting this error and how to fix it?
-----------UPDATE-------------
Found the fix, it was because of my corrupted package-lock file. When I tested in local without the docker, I somehow corrupted the lock file, and later stage when I build and try to run using docker, the corrupted lock file was causing a whole lot of issues. So I deleted it and again ran thru docker...It's working as expected.

Answer 1

I had the same issue and the fix for me was running npm install -g jest (or yarn global add jest).
To add this to your package.json do the following:
"scripts: {
"test": "npm install -g jest && jest --verbose"
},