Testing Bazel rules?

[Jonathan Lange]

Hello,

Is there any guidance for testing Bazel rules?

I notice that rules_go has a pretty impressive test infrastructure, but there's little in the way of commentary, so it would take rather a lot of work to figure out how rules for another language could do likewise.

Is there a blog post or a document or something I could take a look at?

Thanks,

jml

[Jon Brandvein]

Have you seen the Skylark testing page?

https://g3doc.corp.google.com/devtools/blaze/rules/g3doc/testing.md?cl=head

[Jonathan Lange]

I don't have access to that any more. Is there a public URL?

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[Jon Brandvein]

Apologies for the non-functional link.

We don't yet have a dedicated framework for unit testing Skylark rules. The general trick in the meantime is to put assertions (using fail()) inside dummy rules that depend on the rules under test, so that they have access to the returned providers. And of course, you can also have assertions over helper functions without having to depend on anything. Any assertion failures will be treated as a failure to build the dummy rule.

We'll be looking to add stronger Skylark testing support in the future. In the meantime we should externalize that doc.

On Fri, Sep 22, 2017 at 2:17 AM, Jonathan Lange <j...@mumak.net> wrote:

I don't have access to that any more. Is there a public URL?

On Fri, 22 Sep 2017 at 01:11, 'Jon Brandvein' via bazel-discuss <bazel-discuss@googlegroups.com> wrote:

Have you seen the Skylark testing page?

https://g3doc.corp.google.com/devtools/blaze/rules/g3doc/testing.md?cl=head

On Thursday, September 21, 2017 at 2:54:07 AM UTC-4, Jonathan Lange wrote:

Hello,

Is there any guidance for testing Bazel rules?

I notice that rules_go has a pretty impressive test infrastructure, but there's little in the way of commentary, so it would take rather a lot of work to figure out how rules for another language could do likewise.

Is there a blog post or a document or something I could take a look at?

Thanks,

jml

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[ittai zeidman]

There is also work being done by Damien to enable end to end testing with Bazel as part of a bazel Build.
Not sure when it will be exposed but you can take a look at rules scala's bash script to get a sense of our e2es. Once Damien's work will be released we'll probably migrate to using it (currently our e2es don't run in Bazel)