I'm using BluebirdJS promise library and I have .catch that I can't mock that is why I can't cover it with my code coverage using istanbul.

.then(() => ....)
/* istanbul ignore next */ -> Does not work
.catch((err) => err) /// I want to ignore this

Is this possible with istanbul library?

This is the full code, my test can't reach the .catch because it's always passing and I can't seem to another way to force mongoose to throw an error

 const { payload } = request

 const group = new LocationGroups(payload)

 group.save()
   .then(reply)
   .catch((error) => reply(boomify(error)))

I'm using BluebirdJS promise library and I have .catch that I can't mock that is why I can't cover it with my code coverage using istanbul.

.then(() => ....)
/* istanbul ignore next */ -> Does not work
.catch((err) => err) /// I want to ignore this

Is this possible with istanbul library?

This is the full code, my test can't reach the .catch because it's always passing and I can't seem to another way to force mongoose to throw an error

 const { payload } = request

 const group = new LocationGroups(payload)

 group.save()
   .then(reply)
   .catch((error) => reply(boomify(error)))

• javascript
• promise
• code-coverage
• istanbul

• Try making it testable? Why do you think you can't mock it? – Bergi Commented Sep 18, 2017 at 0:53
• How about putting the ment inside the callback that should be ignored? – Bergi Commented Sep 18, 2017 at 0:53
• @Bergi Please see my edit. I'm not sure how to force mongoose to force an error with .save – kdlcruz Commented Sep 18, 2017 at 1:04
• @Bergi putting the ment inside won't work because I can't reach it. Thanks btw, for the ment :) – kdlcruz Commented Sep 18, 2017 at 1:07
• You can't force mongoose to do anything, but you could just mock save?What libraries do you use for testing? – Bergi Commented Sep 18, 2017 at 1:08

2 Answers 2

try {

} catch (err) /* istanbul ignore next */ {

}

In your case

group.save()
   .then(reply)
   .catch(  /* istanbul ignore next */(error) => reply(boomify(error)))

Alternatively, you can wrap your catch in another block

 try {
    stuff()
  } catch (err) {
    /* istanbul ignore next */ {
      console.error(err)
      throw err
    }
  }