Where in the limma package's directory are the unit tests located? Are they all in one file?

As with most R packages, the unit tests are in the 'tests' directory of the source package. But do note that this dir doesn't end up in the installed package.

git clone https//git.bioconductor.org/packages/limma
<things happen>
$ ls limma/
DESCRIPTION  inst  man  NAMESPACE  R  src  tests  vignettes

$ ls limma/tests/
limma-Tests.R  limma-Tests.Rout.save

## and from within R

> dir(path.package("limma"))
 [1] "CITATION"    "DESCRIPTION" "doc"         "help"        "html"       
 [6] "INDEX"       "libs"        "MD5"         "Meta"        "NAMESPACE"  
[11] "NEWS.Rd"     "R"