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Debugging tests
================
You can use the `TEST_FILTER` environment variable, e.g., `TEST_FILTER=xxx`
will filter test named `test_xxx`.
Setting `TEST_GECKODRIVER_TRACE` to any value will make Selenium dump a trace
log for debugging.
You can control running headless or not with `TEST_NO_HEADLESS`. Currently,
the copy/paste image test required NOT to run headless.
More useful for local repro, you can set `TEST_NO_QUIT` if you need to keep
inspecting the browser at the end of a test.
Data URL containing the diff screenshot will be dumped to stdout/stderr when
`TEST_DUMP_DIFF` is set in the environment.
Updating reference screenshots
==============================
- `./mach try fuzzy --push-to-lando --full --env TEST_COLLECT_REFERENCE=1 -q "'snap-upstream-test"`
- note the successfull task id you want to source
- you need curl and jq installed
- ./update-references.sh <TASK_ID>
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