R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> ## These tests need to be last of all tests, otherwise
> ## covr::package_coverage() gives an error.
> cat("1. Loading package\n")
1. Loading package
> loadNamespace("matrixStats")
<environment: namespace:matrixStats>
> stopifnot("matrixStats" %in% loadedNamespaces())
> 
> cat("2. Unloading package\n")
2. Unloading package
> unloadNamespace("matrixStats")
> stopifnot(!"matrixStats" %in% loadedNamespaces())
> 
> if (FALSE) {
+   ## 'covr' gives "Error in library("matrixStats") :
+   ## there is no package called 'matrixStats'" here, cf.
+   ## https://travis-ci.org/HenrikBengtsson/matrixStats/builds/48015577
+ 
+   cat("3. Attaching package\n")
+   library("matrixStats")
+   stopifnot("package:matrixStats" %in% search())
+ 
+   cat("4. Detaching package\n")
+   detach("package:matrixStats")
+   stopifnot(!"package:matrixStats" %in% search())
+   stopifnot("matrixStats" %in% loadedNamespaces())
+ 
+   cat("5. Unloading package\n")
+   unloadNamespace("matrixStats")
+   stopifnot(!"matrixStats" %in% loadedNamespaces())
+ 
+   cat("6. Attaching package (again)\n")
+   library("matrixStats")
+   stopifnot("package:matrixStats" %in% search())
+ 
+   cat("7. Detaching package (again)\n")
+   detach("package:matrixStats")
+   stopifnot(!"package:matrixStats" %in% search())
+   stopifnot("matrixStats" %in% loadedNamespaces())
+ }
> 
> cat("7. DONE\n")
7. DONE
> 
> proc.time()
   user  system elapsed 
   0.14    0.01    0.14