How to unit test expressions

[nreese]

Is there any way to unit test expressions? For example, I am working on an expression to pull a value from features and would like to set up a unit test that takes the expression and provides the output when passed features. Is this possible.

[ryanhamley]

@nreese We have separate tests for expressions which aren't unit tests. The expression test runner is https://github.com/mapbox/mapbox-gl-js/blob/master/test/expression.test.js

Is this something you're planning on submitting as a PR for inclusion in the library?

[nreese]

Is this something you're planning on submitting as a PR for inclusion in the library?

No. Testing the output of expressions in isolation seems like a common use case across mapbox users. I am just curious if there was an easy way to test expressions.

[ryanhamley]

Ah ok, it sounds like you're thinking more of a way to evaluate an expression outside of GL JS like #7670

[nreese]

it sounds like you're thinking more of a way to evaluate an expression outside of GL JS like #7670

Yes.

[ryanhamley]

Cool, I'm going to close this as a duplicate so we can focus discussion in one ticket. Thanks!