add_dependency: Add a vdiffr dependency


It is useful to record the version number of all the packages on which your visual test cases depend. A note containing a version number is added to the DESCRIPTION file for each dependency. Dependencies on svglite and ggplot2 are automatically added. In addition, add_dependency() can be called in any testthat file to manually add a dependency to a package.





A vector containing the names of the packages for which a dependency should be added.

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