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unit-test builder with vitest runner does not support vi.mock() #31609
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- changed the title
[-]`unit-test` builder does not support `vi.mock()`[/-][+]`unit-test` builder with `vitest` runner does not support `vi.mock()`[/+]on Oct 27, 2025 This feature request is now candidate for our backlog! In the next phase, the community has 60 days to upvote. If the request receives more than 20 upvotes, we'll move it to our consideration list.
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- marked Vitest module mocking doesn't work in Angular 21 #32212 as a duplicate of this issue
on Dec 31, 2025 Does an issue get reopened if it gets 20 votes after the 20 day polling process? We seems to have missed the deadline by less than 2 days
Reacted by Ramiro Jr. Franco- added a commit that references this issue
on Feb 9, 2026 This issue has been automatically locked due to inactivity.
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on Mar 12, 2026
Command
test
Description
When using the new
unit-testbuilder with Vitest runner, some Vitest features such as the module graph or module "mocking" withvi.mock()(https://vitest.dev/guide/mocking/modules.html) do not work.This is due to the fact that the builder is building the tests and then providing the built chunks to Vitest so Vitest is not aware of the real module graph.
Luckily, Angular developers have the luxury of dependency injection that avoids relying on test framework for replacing things with test doubles.
That said, there are some use cases, specially when relying on 3rd party libraries that might require module "mocking".
For instance, AFAIK, the main approach to achieve Shallow testing in AOT without altering production code is to use this feature (cf. https://marmicode.io/blog/angular-template-code-coverage-and-future-proof-testing#:~:text=Shallow%20Testing%20is%20More%20Challenging)
Describe the solution you'd like
Let vitest resolve modules 😇
Describe alternatives you've considered
In the mean time, it would be nice to monkey patch
vi.mockand make it throw an error indicating that the feature is not supported.