Add a lack-of-fit test

- Switch an example dataset in the test setup to a dataset with
replicates, adapt tests
- Skip the test for lrtest with an update specification as it does not
only fail when pkgdown generates static help pages, but also in testthat

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/reference/loftest-2.png b/docs/reference/loftest-2.png
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