Dynamic import spy not working

[amprew]

• Operating System: macOS Sierra: 10.12.6
• Node Version: 8.11.3
• NPM Version: 5.6.0
• webpack Version: 3.12.0
• karma-webpack Version: 3.0.5

Expected Behavior

When I spy upon System.import like:

spyOn(System, 'import').and.returnValue(Promise.resolve('value to be returned'));

and call like this:

System.import('not real route');

I expect to receive:

Promise -> 'value to be returned'

Actual Behavior

when run:

Code

    spyOn(System, 'import').and.returnValue(Promise.resolve('value to be returned'));

    console.log(System.import('not real route'));

How Do We Reproduce?

Follow expected behavior.

[alexander-akait]

@MountainDrew System.import deprecated in webpack@4 and will be remove in webpack@5, better avoid using this

[amprew]

@evilebottnawi - good to know, thanks! With the alternative being import (https://whatwg.github.io/loader/#loader-import), would you recommend spyOn(Loader, 'import')?

[alexander-akait]

@MountainDrew what is spyOn?

[amprew]

@evilebottnawi - ah my bad. It's just a method to overwrite the implemented function, effectively stubbing it. It checks a number of things like called with/number of times... I was effectively asking which Prototype it is built off?

[amprew]

Happy to close this issue. I guess it's a no need to fix 👍

[alexander-akait]

@MountainDrew Feel free to feedback

It's just a method to overwrite the implemented function, effectively stubbing it. It checks a number of things like called with/number of times

Depends on what tool you use for testing, it is better to check it in the documentation for testing tool.