nest-jest error of injeccion while run my test | NestJS | Page 1

somber fox Oct 28, 2022, 7:40 PM

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can you show us MasterDataModule

strong apex Oct 28, 2022, 7:44 PM

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yes I can

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somber fox Oct 28, 2022, 7:47 PM

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that's weird

mild timber Oct 28, 2022, 7:48 PM

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Full error?

strong apex Oct 28, 2022, 7:50 PM

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mild timber Oct 28, 2022, 8:13 PM

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Where does master-dataConnection come from?

strong apex Oct 28, 2022, 10:08 PM

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Is a provider

mild timber Oct 28, 2022, 10:08 PM

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Great

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Where does it come from?

strong apex Oct 28, 2022, 10:08 PM

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Wait

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in mi app.module I include my database module
this module contains the two connections I use
then the database module looks like this (image 2):

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good, Well, I imported the database module in my test and it worked, is it correct to do this?

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somber fox Oct 28, 2022, 10:21 PM

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It depends
Are you making an unit test of CalculationService?

strong apex Oct 28, 2022, 10:22 PM

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yess

somber fox Oct 28, 2022, 10:23 PM

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So I don’t see any good reason to import other modules

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Read this: https://trilon.io/blog/advanced-testing-strategies-with-mocks-in-nestjs#Unit-Testing-with-more-complex-dependencies

Trilon

Advanced Testing Strategies with Mocks

Creating unit tests requires mocks or stubs to serve as proxy for some dependencies. In some cases, these dependencies are not so easily replaceable because they have many methods and/or objects as parameters. Let's learn some strategies to easily mock them.

strong apex Oct 28, 2022, 10:24 PM

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OK, now I get an error with configService

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somber fox Oct 28, 2022, 10:25 PM

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Why?

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You aren’t exercising that service

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You shouldn’t have any error on that. Got it?

strong apex Oct 28, 2022, 10:26 PM

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My provider is used by the configServices to obtain the environment variables, is that why?

somber fox Oct 28, 2022, 10:27 PM

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Mock it then

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Otherwise you’ll end up testing that another service as a side-effect

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The post I’ve shared with you has basically everything you need to know in order to get no dependency resolution error on unit tests

strong apex Oct 28, 2022, 10:30 PM

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good

#nest-jest error of injeccion while run my test