diff --git a/tests/testthat/test-convertedBaseFunctions.R b/tests/testthat/test-convertedBaseFunctions.R
index c903441..bfc3fe8 100644
--- a/tests/testthat/test-convertedBaseFunctions.R
+++ b/tests/testthat/test-convertedBaseFunctions.R
@@ -194,4 +194,11 @@ test_that("fix works as expected", {
 	X <- matrix(c(-1.9, -3.4, 1.6, 2.5, -4.5, 4.5), 3, byrow=TRUE)
 	Y <- matrix(c(-1, -3, 1, 2, -4, 4), 3, byrow=TRUE)
 	expect_identical(fix(X), Y)
+})
+
+test_that("isspace works as expected", {
+	chr <- '123 Main St.'
+	X <- '\t a b\tcde f'
+	expect_identical(isspace(chr), c(0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0))
+	expect_identical(isspace(X), c(1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0))
 })
\ No newline at end of file