diff --git a/tests/testthat/test-add_alttext.R b/tests/testthat/test-add_alttext.R
index 1dbd99c2..63b5f1f5 100644
--- a/tests/testthat/test-add_alttext.R
+++ b/tests/testthat/test-add_alttext.R
@@ -106,6 +106,88 @@
 #     recursive = TRUE
 #   ), add = TRUE)
 # })
+
+test_that("add_alttext() adds tagged alt text and leaves existing text unchanged", {
+  dir <- tempfile()
+  dir.create(dir)
+  on.exit(unlink(dir, recursive = TRUE))
+
+  tex <- c(
+    "\\includegraphics[width=\\linewidth,keepaspectratio]{biomass.pdf}",
+    "\\caption{\\label{fig-biomass} Biomass}",
+    "\\includegraphics[width=\\linewidth,keepaspectratio,alt={'Existing text'}]{survey.pdf}",
+    "\\caption{\\label{fig-survey} Survey}"
+  )
+  writeLines(tex, file.path(dir, "source.tex"))
+  utils::write.csv(
+    data.frame(
+      label = c("biomass", "survey", "missing"),
+      alt_text = c("Biomass plot", "Updated text", "No figure")
+    ),
+    file.path(dir, "alttext.csv"),
+    row.names = FALSE
+  )
+
+  add_alttext(
+    x = "source.tex",
+    dir = dir,
+    alttext_csv = file.path(dir, "alttext.csv"),
+    compile = FALSE,
+    rename = "renamed"
+  )
+
+  output <- readLines(file.path(dir, "renamed.tex"))
+  expect_true(any(grepl("keepaspectratio,alt={'Biomass plot'}", output, fixed = TRUE)))
+  expect_true(any(grepl("alt={'Existing text'}", output, fixed = TRUE)))
+  expect_false(any(grepl("Updated text", output, fixed = TRUE)))
+  expect_equal(readLines(file.path(dir, "source.tex")), tex)
+})
+
+test_that("add_alttext() supports the tooltip path", {
+  dir <- tempfile()
+  dir.create(dir)
+  on.exit(unlink(dir, recursive = TRUE))
+
+  writeLines(
+    c(
+      "\\pandocbounded{\\includegraphics[width=\\linewidth,keepaspectratio]{biomass.pdf}}",
+      "\\caption{\\label{fig-biomass} Biomass}"
+    ),
+    file.path(dir, "source.tex")
+  )
+  utils::write.csv(
+    data.frame(label = "biomass", alt_text = "Biomass plot"),
+    file.path(dir, "alttext.csv"),
+    row.names = FALSE
+  )
+
+  add_alttext(
+    x = "source.tex",
+    dir = dir,
+    alttext_csv = file.path(dir, "alttext.csv"),
+    compile = FALSE,
+    tagged = FALSE
+  )
+
+  output <- readLines(file.path(dir, "source.tex"))
+  expect_true(any(grepl("Biomass plot", output, fixed = TRUE)))
+})
+
+test_that("add_alttext() reports missing input files", {
+  dir <- tempfile()
+  dir.create(dir)
+  on.exit(unlink(dir, recursive = TRUE))
+
+  expect_error(add_alttext(x = "missing.tex", dir = dir, compile = FALSE))
+
+  writeLines("text", file.path(dir, "source.tex"))
+  expect_error(add_alttext(
+    x = "source.tex",
+    dir = dir,
+    alttext_csv = file.path(dir, "missing.csv"),
+    compile = FALSE
+  ))
+})
 #
 # # test_that("add_alttext() renames altered tex file.", {
 #
diff --git a/tests/testthat/test-add_child.R b/tests/testthat/test-add_child.R
new file mode 100644
index 00000000..2a5c2ab7
--- /dev/null
+++ b/tests/testthat/test-add_child.R
@@ -0,0 +1,11 @@
+test_that("add_child() adds labeled child chunks and separates them", {
+  output <- add_child(
+    x = c("introduction.qmd", "tables.qmd"),
+    label = c("introduction", "tables")
+  )
+
+  expect_true(grepl("knit_child('introduction.qmd'", output, fixed = TRUE))
+  expect_true(grepl("knit_child('tables.qmd'", output, fixed = TRUE))
+  expect_true(grepl("{{< pagebreak >}}", output, fixed = TRUE))
+  expect_true(grepl("\\clearpage", output, fixed = TRUE))
+})
diff --git a/tests/testthat/test-add_tagging.R b/tests/testthat/test-add_tagging.R
index d86b73b7..feaf6371 100644
--- a/tests/testthat/test-add_tagging.R
+++ b/tests/testthat/test-add_tagging.R
@@ -32,3 +32,64 @@
 #                  recursive = TRUE
 #   ), add = TRUE)
 # })
+
+test_that("id_num_headers() tags tables and leaves documents without tables unchanged", {
+  no_tables <- c("\\section{Introduction}", "Text")
+  expect_identical(id_num_headers(no_tables), no_tables)
+
+  tables <- c(
+    "\\begin{table}",
+    "Table contents",
+    "\\end{table}",
+    "\\begin{longtable}",
+    "Long table contents",
+    "\\end{longtable}"
+  )
+  output <- id_num_headers(tables)
+
+  expect_equal(sum(grepl("table/header-rows", output, fixed = TRUE)), 2)
+  expect_lt(
+    match("\\tagpdfsetup{table/header-rows={1}}", output),
+    match("\\begin{table}", output)
+  )
+  expect_lt(
+    match("\\tagpdfsetup{table/header-rows={1}}", output),
+    match("\\begin{longtable}", output)
+  )
+})
+
+test_that("add_tagging() writes tagged TeX and accessibility metadata without compiling", {
+  dir <- tempfile()
+  dir.create(dir)
+  on.exit(unlink(dir, recursive = TRUE))
+
+  writeLines(
+    c(
+      "\\PassOptionsToPackage{dvipsnames,svgnames,x11names}{xcolor}",
+      "\\hypersetup{linkcolor=}",
+      "\\IfFileExists{microtype.sty}{% use microtype if available",
+      "microtype line 2",
+      "microtype line 3",
+      "microtype line 4",
+      "\\begin{table}",
+      "Table contents",
+      "\\end{table}"
+    ),
+    file.path(dir, "source.tex")
+  )
+
+  add_tagging(
+    x = "source.tex",
+    dir = dir,
+    compile = FALSE,
+    rename = "tagged"
+  )
+
+  output <- readLines(file.path(dir, "tagged.tex"))
+  expect_true(any(grepl("\\input{accessibility.tex}", output, fixed = TRUE)))
+  expect_true(any(grepl("\\hypersetup{linkcolor=.}", output, fixed = TRUE)))
+  expect_true(any(grepl("table/header-rows={1}", output, fixed = TRUE)))
+  expect_true(grepl("^% ", output[grep("microtype.sty", output)]))
+  expect_true(file.exists(file.path(dir, "accessibility.tex")))
+  expect_true(any(grepl("tagging = on", readLines(file.path(dir, "accessibility.tex")), fixed = TRUE)))
+})
diff --git a/tests/testthat/test-export_split_tbls.R b/tests/testthat/test-export_split_tbls.R
index d3aabb85..dd6a04c7 100644
--- a/tests/testthat/test-export_split_tbls.R
+++ b/tests/testthat/test-export_split_tbls.R
@@ -27,6 +27,26 @@
 #   file.remove(fs::path(getwd(), "key_quantities.csv"))
 #   unlink(fs::path(getwd(), "tables"), recursive = T)
 # })
+
+test_that("export_split_tbls() exports a table that fits in one part", {
+  tables_dir <- tempfile()
+  dir.create(file.path(tables_dir, "tables"), recursive = TRUE)
+  on.exit(unlink(tables_dir, recursive = TRUE))
+
+  rda <- list(
+    table = gt::gt(data.frame(Year = 2020:2021, Estimate = c(1, 2)))
+  )
+  save(rda, file = file.path(tables_dir, "tables", "summary.rda"))
+
+  n_tables <- export_split_tbls(
+    tables_dir = tables_dir,
+    plot_name = "summary.rda",
+    essential_columns = 1
+  )
+
+  expect_equal(n_tables, 1)
+  expect_true(file.exists(file.path(tables_dir, "tables", "summary_split.rda")))
+})
 #
 #
 # test_that("Number of split tables is calculated correctly for 3 tables", {
diff --git a/tests/testthat/test-format_quarto.R b/tests/testthat/test-format_quarto.R
new file mode 100644
index 00000000..b3202c8d
--- /dev/null
+++ b/tests/testthat/test-format_quarto.R
@@ -0,0 +1,15 @@
+test_that("format_quarto() builds PDF and HTML formatting", {
+  pdf <- format_quarto(format = "pdf", type = "pfmc")
+  pdf_sar <- format_quarto(format = "pdf", type = "sar")
+  html <- format_quarto(format = "html")
+
+  expect_true(grepl("support_files/pfmc.tex", pdf, fixed = TRUE))
+  expect_false(grepl("support_files/pfmc.tex", pdf_sar, fixed = TRUE))
+  expect_true(grepl("support_files/theme.scss", html, fixed = TRUE))
+  expect_false(grepl("support_files/pfmc.tex", html, fixed = TRUE))
+})
+
+test_that("format_quarto() reports unsupported formats", {
+  expect_error(format_quarto(format = "docx"), "not yet a functional format")
+  expect_error(format_quarto(format = "other"), "Invalid render format")
+})