React-native-reanimated: Jest error when using .interpolate

[thiagoferolla]

I wrote an animation using timing and interpolate but when testing the component with Jest it fails with the error buttonAnimationState.interpolate is not a function even though I'm using the official mock from react-native-reanimated.

jest.mock("react-native-reanimated", () => require("react-native-reanimated/mock"))

Checking the mock provided, I found an .interpolate definition so I don't know what's happening. Maybe it's missing in the new Animated.Value() mock

[jakub-gonet]

Hard to say, could you provide snack with said component and jest test case?

[josephluck]

Also running in to this. @thiagoferolla did you find a solution?

[mym0404]

@jakub-gonet

I inspected react-native-reanimated/mock file and recognized one.
There is no interpolate function in exported Value.

Quick fix : Add interpolate in Value constructor function

This resolved my case. But it seems to need PR for this.

I am using typescript. Is is related to this issue?

[Darapsas]

When are you planning to merge this issue? It is getting old, going, and changing this line of code in the node_modules everytime I need to run tests after openning it in vs code.

[satya164]

@Darapsas just use https://github.com/ds300/patch-package

[Darapsas]

Holy shit - thanks a lot (@satya164 ). The more you know.