"`label_color` must be a single non-NA character string"
"`set_color` must be a single non-NA character string"
"`title_color` must be a single non-NA character string"
"`title` must be a single non-NA character string"
"`label_sep` must be a single non-NA character string"
"`palette` must be a single non-NA character string"
"`preview` must be a single logical value"
"`return_sets` must be a single logical value"
"`auto_scale` must be a single logical value"
"`label_alpha` must be a numeric value between 0 and 1"
"`fill_alpha` must be a numeric value between 0 and 1"
"plot_venn() gradient method returns a ggplot"
"plot_venn() return_sets returns a named list"
"plot_venn() category.names mismatch handled gracefully"
"plot_venn() non-vector input triggers error"
"plot_venn() empty input triggers error"
"plot_venn() type mismatch triggers warning"
"plot_venn() handles custom colors and styling"
"plot_venn() handles different label types"
"plot_venn() handles gradient method parameters"

plot_venn() return_sets returns a named list

plot_venn() category.names mismatch handled gracefully

plot_venn() type mismatch triggers warning

plot_venn() handles custom colors and styling

plot_venn() handles different label types