tests/testthat/_snaps/plot.md

In ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics

ggplot() throws informative errors

`mapping` must be created by `aes()`.
x You've supplied a character vector.

`data` cannot be a function.
i Have you misspelled the `data` argument in `ggplot()`?

Arguments in `...` must be used.
x Problematic argument:
* foobar = "nonsense"
i Did you misspell an argument name?

construction have user friendly errors

Cannot use `+` with a single argument.
i Did you accidentally put `+` on a new line?

Cannot add <ggproto> objects together.
i Did you forget to add this object to a <ggplot> object?

Can't add `1` to a <ggplot> object.

Can't add `geom_point` to a <ggplot> object
i Did you forget to add parentheses, as in `geom_point()`?

ggplot2 documentation built on Sept. 11, 2025, 9:10 a.m.