Running tests in headless mode for Firefox is failing with 500 code response but ok in web browser

[austincarrig]

Describe the Bug

Running wasm-pack test --headless --firefox should show passed tests, but it fails.

Duplicate of issue #2261

Steps to Reproduce

1. -> git clone https://github.com/rustwasm/wasm_game_of_life.git
2. -> cd wasm_game_of_life
3. -> wasm-pack test --firefox --headless

If applicable, add a link to a test case (as a zip file or link to a repository we can clone).

Expected Behavior

Should pass tests.

Actual Behavior

Tests fail when they should pass

Additional Context

Add any other context about the problem here.

[alexlapa]

There are a lot of things that could go wrong. Could you please run tests with logging on?

RUST_LOG=DEBUG wasm-pack test --firefox --headless

And specify geckodriver and Firefox versions: firefox -V, geckodriver -V.

[austincarrig]

I pushed the log up to my project: log file. It's a lot, about 30,000 lines of output.

I don't have Firefox or Geckodriver installed, but this was working a few weeks ago no problem without them installed...

It's also failing in Travis CI, and I don't specify geckodriver/firefox versions for that. Example here. If you can't see that let me know, it should be public but I'm relatively new to working with Travis CI.

[alexlapa]

You have wasm-bindgen version locked at 0.2.63 on #automation-testing branch, and this issue is supposed to be fixed in 0.2.68. Try running cargo update and rerun CI.

[austincarrig]

This is such a simple thing, I can't believe I missed it... thank you @alexlapa.