Nothing
library(xdvir)
author("This is a test: $x - \\mu$")
## Invalid engine
tools::assertError(author("test", engine=NULL))
## Explicit engine
author("test", engine=xdvir:::nullEngine)
## Engine by name
author("test", engine="null")
## Unknown engine (name)
tools::assertError(author("test", engine="unknown"))
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