add min/max to gleam/list

1 files changed, 36 insertions, 0 deletions

diff --git a/test/gleam/list_test.gleam b/test/gleam/list_test.gleam
index 79795e0..0e7e4de 100644
--- a/test/gleam/list_test.gleam
+++ b/test/gleam/list_test.gleam
@@ -1281,3 +1281,39 @@ pub fn shuffle_test() {
   list.range(0, recursion_test_cycles)
   |> list.shuffle()
 }
+
+pub fn max_test() {
+  []
+  |> list.max(int.compare)
+  |> should.equal(Error(Nil))
+
+  [1, 3, 2]
+  |> list.max(int.compare)
+  |> should.equal(Ok(3))
+
+  [-1.0, 1.2, 1.104]
+  |> list.max(float.compare)
+  |> should.equal(Ok(1.2))
+
+  ["a", "c", "b"]
+  |> list.max(string.compare)
+  |> should.equal(Ok("c"))
+}
+
+pub fn min_test() {
+  []
+  |> list.min(int.compare)
+  |> should.equal(Error(Nil))
+
+  [1, 3, 2]
+  |> list.min(int.compare)
+  |> should.equal(Ok(1))
+
+  [-1.0, 1.2, 1.104]
+  |> list.min(float.compare)
+  |> should.equal(Ok(-1.0))
+
+  ["a", "c", "b"]
+  |> list.min(string.compare)
+  |> should.equal(Ok("a"))
+}