This seems a bit weird to me. I'm trying to test an actual (ie. real network) request with Jest.
These are the tested scenarios:
- Test an external API (fixer.io) with no headers <--- This works
- Test a local API server with headers <--- This does NOT work
- Test same local API with headers from
node
terminal <--- This works
What could be the reason behind this behavior? And what is the solution?
//This WORKS
test('testing no headers', () => {
return axios.get('http://api.fixer.io/latest')
.then( res => console.log(res) )
});
//This DOES NOT work
test('testing no headers', () => {
return axios.get('http://localhost:3000/users/4/profile',
{headers:{authorization:`Bearer ${mytoken}`}})
.then( res => console.log(res) )
});
//...
//Node Terminal
//This WORKS
> axios.get('http://localhost:3000/users/4/profile',
{headers:{authorization:`Bearer ${mytoken}`}})
.then( res => console.log(res) )
It can be a Jest configuration issue. I solved forcing "node" as jest environment in package.json:
"jest": { "testEnvironment": "node" }
see docs: https://facebook.github.io/jest/docs/configuration.html#testenvironment-string
Jest allows you to set a setup script file. This file will be required before everything else and gives you a chance to modify the environment in which the tests will run. This way you can unset XMLHttpRequest before axios is loaded and the adapter type evaluated since imports are hoisted. https://facebook.github.io/jest/docs/configuration.html#setuptestframeworkscriptfile-string
This worked for me:
package.json
__tests__/setup.js
I resolved it by adding
for a specific test case file, as setting global.XMLHttpRequest = undefined or env=node was causing my other test cases to fail.
That is funny,that the axios used XMLHttpRequest by primary,and ajax request can't access across domain,so your test failed ,so you can let your code pass by set the axios adapter.
The Reason by axios/defaults.js
Solution change axios adapter to http
Solution change jest testURL in package.json
then the test can be access http via ajax