1 files changed, 30 insertions, 0 deletions
diff --git a/test/gleam/string_test.gleam b/test/gleam/string_test.gleam
index 8ad1080..14b034c 100644
--- a/test/gleam/string_test.gleam
+++ b/test/gleam/string_test.gleam
@@ -388,3 +388,33 @@ pub fn last_test() {
   |> string.last
   |> should.equal(Some(" "))
 }
+
+pub fn capitalize_test() {
+  ""
+  |> string.capitalize
+  |> should.equal("")
+
+  "gleam"
+  |> string.capitalize
+  |> should.equal("Gleam")
+
+  "GLEAM"
+  |> string.capitalize
+  |> should.equal("Gleam")
+
+  "g l e a m"
+  |> string.capitalize
+  |> should.equal("G l e a m")
+
+  "1GLEAM"
+  |> string.capitalize
+  |> should.equal("1gleam")
+
+  "_gLeAm1"
+  |> string.capitalize
+  |> should.equal("_gleam1")
+
+  " gLeAm1"
+  |> string.capitalize
+  |> should.equal(" gleam1")
+}