diff --git a/tests/testthat/_snaps/treat-argument.md b/tests/testthat/_snaps/treat-argument.md
new file mode 100644
index 0000000..1099a6d
--- /dev/null
+++ b/tests/testthat/_snaps/treat-argument.md
@@ -0,0 +1,26 @@
+# spq_treat_argument() errors for no equivalent
+
+    Code
+      spq_treat_argument("something(bla)")
+    Condition
+      Error in `spq_translate_dsl()`:
+      ! x Can't find SPARQL equivalent for something().
+      i If you think there should be one, open an issue in https://github.com/lvaudor/glitter.
+
+# COUNT()
+
+    Code
+      spq_init() %>% spq_add("?film wdt:P31 wd:Q11424") %>% spq_mutate(
+        narrative_location = wdt::P840(film)) %>% spq_mutate(count = n()) %>%
+        spq_select(-film, -narrative_location)
+    Output
+      
+      SELECT (COUNT(*) AS ?count)
+      WHERE {
+      
+      ?film wdt:P31 wd:Q11424.
+      ?film wdt:P840 ?narrative_location.
+      
+      }
+      
+
diff --git a/tests/testthat/test-treat-argument.R b/tests/testthat/test-treat-argument.R
new file mode 100644
index 0000000..7e3349b
--- /dev/null
+++ b/tests/testthat/test-treat-argument.R
@@ -0,0 +1,15 @@
+test_that("spq_treat_argument() errors for no equivalent", {
+  expect_snapshot(error = TRUE, {
+    spq_treat_argument("something(bla)")
+  })
+})
+
+test_that("COUNT()", {
+  expect_snapshot(
+    spq_init() %>%
+      spq_add("?film wdt:P31 wd:Q11424") %>%
+      spq_mutate(narrative_location = wdt::P840(film)) %>%
+      spq_mutate(count = n()) %>%
+      spq_select(- film, - narrative_location)
+  )
+})