Updated docs for testing and adding primary variables (Thanks David a…

[RoryBarnes]

…nd Sam!)

Proposed changes

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• [ ] Bugfix (non-breaking change that fixes an issue)
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• [ ] Documentation update

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[github-actions[bot]]

Test Results

19 130 tests   19 114 :white_check_mark:  3m 35s :stopwatch:      1 suites       0 :zzz:      1 files        16 :x:

For more details on these failures, see this check.

Results for commit c0b2efbb.

[github-actions[bot]]

Test Results

19 130 tests   19 114 :white_check_mark:  4m 4s :stopwatch:      1 suites       0 :zzz:      1 files        16 :x:

For more details on these failures, see this check.

Results for commit c0b2efbb.

:recycle: This comment has been updated with latest results.