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Compatibility with ggplot2 #130

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teunbrand
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Hi there,

Apologies for not posting an issue first and ignoring the PR template.
The ggplot2 package is planning an update for around May 2025 and a reverse dependency test identified a problem with the vaccineff package.
The details are explained in tidyverse/ggplot2#6290, but essentially ggplot2 doesn't populate the plot$labels field before plot building anymore, which violates some test assumptions in this package.

This PR changes the tests to be compatible with both versions of ggplot2.
You can test the changes yourself with the development version of ggplot2 (pak::pak("tidyverse/ggplot2"))

Best,
Teun

Comment on lines +55 to +60
labels <- if ("get_labs" %in% getNamespaceExports("ggplot2")) {
expect_identical(ggplot2::get_labs(plt)$y, "Doses per day")
} else {
expect_identical(plt$labels$y, "coverage * max(dose_plot)")
}

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I should mention that building plt here throws an error due to r-lib/scales#413. This should fix itself once scales releases the next version.

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