diff --git a/tests/testthat/test-gitbook.R b/tests/testthat/test-gitbook.R
index abf1345dd..5e62f92bb 100644
--- a/tests/testthat/test-gitbook.R
+++ b/tests/testthat/test-gitbook.R
@@ -54,3 +54,56 @@ test_that("gitbook() correctly handles extra_dependency after its own", {
   extra_css <- xml2::xml_find_all(gitbook_css, "./following-sibling::link[contains(@href, 'font-awesome')]")
   expect_gt(length(extra_css), 0L)
 })
+
+test_that("gitbook() correctly splits with a specified numeric", {
+      
+  skip_on_cran()
+  skip_if_not_pandoc()
+  skip_if_not_installed("xml2")
+ 
+  rmd <- local_rmd_file(
+    c("---", "title: test split_by as numeric", "---", "",
+    "# CHAPTER 1", "## SECTION 1", "### SUBSECTION 1", 
+    "#### SUBSUBSECTION 1",
+    "", "# CHAPTER 2", "## SECTION 2")
+  )
+  res <- local_render_book(rmd, output_format = gitbook(split_by = "4", toc_depth = 4))
+  content <- xml2::read_html(res)
+  
+  TOC <- xml2::xml_find_all(content, "//div[@class='book-summary']/nav/ul//li")
+  
+  expect_equal(
+    xml2::xml_attr(TOC, "data-level"), 
+    c("1", "1.1", "1.1.1", "1.1.1.1", "2", "2.1")
+  )
+  expect_equal(
+    xml2::xml_attr(TOC, "data-path"), 
+    c("chapter-1.html", "section-1.html", "subsection-1.html", 
+      "subsubsection-1.html", "chapter-2.html", "section-2.html")
+  )
+  
+})
+
+test_that("gitbook() split by section is equivalent of split by 2", {
+      
+  skip_on_cran()
+  skip_if_not_pandoc()
+  skip_if_not_installed("xml2")
+      
+  rmd <- local_rmd_file(
+    c("---", "title: test split_by section", "---", "",
+      "# CHAPTER 1", "## SECTION 1", "### SUBSECTION 1",
+      "# CHAPTER 2", "## SECTION 2")
+  )
+
+  resSection <- local_render_book(rmd, 
+    output_format = gitbook(split_by = "section"))
+  contentSection <- xml2::read_html(resSection)
+
+  res2 <- local_render_book(rmd, 
+    output_format = gitbook(split_by = "2"))
+  content2 <- xml2::read_html(res2)
+
+  expect_equal(object = content2, expected = contentSection)
+  
+})