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Jest is giving an error of function undefined even when the function is defined in the specified file. I'm testing a function defined in cards.js but jest is also executing my reducer file when I run my test using 'npm
test' and it is giving an error in reducer file that fun is not defined but that function is defined in helper.js and also working perfectly when I run my app. It only gives an error in npm test console.

Error: ● Test suite failed to run
TypeError: (0 , _helper.addValue) is not a function

helper.js

export const addValue = (a, b) => a+ b

filter.reducer.js

import addValue from '../helper';
const result = addValue(5,4);
.
.
.
.

cards.js

import pipe, prop from 'ramda'
exprot const transformCardData = (response) =>
 if(isEmpty(response))
 return 
 
 return pip(
 prop('values)
 )
 

`
cards.test.js

describe('testing transformCardData function ', ()=>
 it('testing empty response',()=>
 expect(transformCardData()).toBe()
 

package.json jest config

"scripts": 
 "analyze": "source-map-explorer build/static/js/main.*",
 "start": "node scripts/start.js",
 "build": "NODE_ENV='production' GENERATE_SOURCEMAP=false node scripts/build.js",
 "test": "node scripts/test.js"
 ,
 "jest": 
 "collectCoverageFrom": [
 "src/**/*.js,jsx,mjs"
 ],
 "setupFiles": [
 "<rootDir>/config/polyfills.js"
 ],
 "testMatch": [
 "<rootDir>/src/**/__tests__/**/*.js,jsx,mjs",
 "<rootDir>/src/**/?(*.)(spec,
"devDependencies": 
 "babel-jest": "20.0.3",
 "jest": "^23.6.0",
 "jest-cli": "^23.6.0",
.
.
.

test.js

'use strict';

// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'test';
process.env.NODE_ENV = 'test';
process.env.PUBLIC_URL = '';

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => 
 throw err;
);

// Ensure environment variables are read.
require('../config/env');

const jest = require('jest');
const argv = process.argv.slice(2);

// Watch unless on CI or in coverage mode
if (!process.env.CI && argv.indexOf('--coverage') < 0) 
 argv.push('--watch');



jest.run(argv);