1 files changed, 42 insertions, 0 deletions
diff --git a/test/gleam/int_test.gleam b/test/gleam/int_test.gleam
index 87de970..90f7e8d 100644
--- a/test/gleam/int_test.gleam
+++ b/test/gleam/int_test.gleam
@@ -500,3 +500,45 @@ pub fn floor_divide_test() {
   int.floor_divide(-99, by: 2)
   |> should.equal(Ok(-50))
 }
+
+pub fn add_test() {
+  int.add(1, 2)
+  |> should.equal(3)
+
+  list.fold([1, 2, 3], 0, int.add)
+  |> should.equal(6)
+
+  3 |> int.add(2)
+  |> should.equal(5)
+}
+
+pub fn multiply_test() {
+  int.multiply(2, 4)
+  |> should.equal(8)
+
+  list.fold([2, 3, 4], 1, int.multiply)
+  |> should.equal(24)
+
+  3 |> int.multiply(2)
+  |> should.equal(6)
+}
+
+pub fn subtract_test() {
+  int.subtract(3, 1)
+  |> should.equal(2)
+
+  list.fold([1, 2, 3], 10, int.subtract)
+  |> should.equal(4)
+
+  3 |> int.subtract(_, 2)
+  |> should.equal(1)
+
+  3 |> int.subtract(2, _)
+  |> should.equal(-1)
+
+  3 |> int.subtract(subtrahend: 2)
+  |> should.equal(1)
+
+  3 |> int.subtract(minuend: 2)
+  |> should.equal(-1)
+}