assertThat: Make a test assertion
In bedatadriven/hamcrest: Hamcrest framework for writing unit tests in R

Description Usage Arguments Details Examples

Use the assertThat() function to write your unit test. The first argument is the result you want to test and the second argument is the matcher that embodies the rule against which you want to test the result.

1	assertThat(actual, matcher)

`actual`	object to be matched
`matcher`	one of the matcher functions, see Details

The second argument matcher of assertThat should be a matcher function. Matcher function returns a function which references the expected value. The actual value is passed to the resulting matcher function.

assertThat(actual, equalTo(expected)) checks that actual is equal to (using the == comparison operator) expected. The equalTo() matcher function can therefore also be used to compare strings.
assertThat(actual, closeTo(expected, delta)) checks that actual is close to expected with a maximum allowed difference of delta.
assertThat(actual, identicalTo(expected)) checks if actual is identical to (using the identical function) expected.
assertThat(actual, isTrue()) and its shorthand assertTrue(value) check that actual or value is identical to TRUE (i.e. the logical vector or length 1). This is the same as assertThat(actual, identicalTo(TRUE)). Use assertThat(actual, isFalse()) or assertFalse(value) to check if actual or value are FALSE.
assertThat(actual, instanceOf(expected)) checks if actual has class (using the inherits function) expected.

## Not run: 
assertThat(-0.50557992900139, closeTo(-0.50557, delta = 1e4))
assertThat(floor(-1.5), identicalTo(-2))
assertThat(qnorm(0, 0, 1,  TRUE,  FALSE), equalTo(-Inf))
assertThat(is.integer(1L), isTrue())
assertThat(is.character(seq(10)), isFalse())
assertThat(log("a"), throwsError())
assertThat(any(range(2.0,3.0)), emitsWarning())
assertThat(1, not(identicalTo(2)))

## End(Not run)