Nothing

```
# Test of the MergeLevels class
#
# Author: jasonm
###############################################################################
library(testthat)
library(Causata)
context("MergeLevels")
numbers <- factor(c(
"one",
"two","two",
"three","three","three",
"four","four","four","four",
"five","five","five","five","five",
"six","six","six","six","six","six"))
num.original.factors <- length(levels(numbers))
#test that you get the number of levels your request
#test that you get an 'other' category where appropriate
#iterate from 2 levels all the way to the original number of levels
for (max.levels in seq(2,num.original.factors)){
mergedNumbers <- MergeLevels(numbers,max.levels)
#test that we have the expected number of levels after merging (including if we ask for the same number we start with
test_that(paste("Correctly reduce to",max.levels,"levels"),
expect_equal(max.levels, length(levels(mergedNumbers)))
)
#test that if we have reduced the number of levels, an 'Other' category has appeared, but not otherwise
if (max.levels < num.original.factors){
test_that("Other category has been created when categories merged",
expect_that("Other" %in% levels(mergedNumbers), is_true())
)
}
else {
test_that("Other category has not been created",
expect_that("Other" %in% levels(mergedNumbers), is_false())
)
}
}
#Check that you get an error if requesting fewer than 2 levels
expect_that(MergeLevels(numbers,0), throws_error())
expect_that(MergeLevels(numbers,1), throws_error())
#Check that you get an error if you call MergeLevels on a variable that is not a factor
expect_that(MergeLevels(c("a","b","c"),2), throws_error())
```

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