Fix CD plot warning #46
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Closes #45.
I also switched the deprecated
is.ggplot()with the alternativeis_ggplot()ggplot2 messages about when running tests interactively.I think it might also be a good idea to maybe refactor tests a little, at least to use
expect_s3_class(class = "ggplot2")rather thanexpect_true(is_ggplot(...))but that's another issue/PR.