1 files changed, 27 insertions, 0 deletions
diff --git a/test/gleam/javascript/map_test.gleam b/test/gleam/javascript/map_test.gleam
new file mode 100644
index 0000000..9620bff
--- /dev/null
+++ b/test/gleam/javascript/map_test.gleam
@@ -0,0 +1,27 @@
+import gleam/javascript/map
+import gleeunit/should
+
+pub fn map_size_test() {
+  let m = map.new()
+  should.equal(map.size(m), 0)
+
+  map.set(m, "a", 1)
+  should.equal(map.size(m), 1)
+
+  map.set(m, "b", 1)
+  should.equal(map.size(m), 2)
+
+  map.set(m, "b", 10)
+  should.equal(map.size(m), 2)
+}
+
+pub fn map_retrieve_test() {
+  let m = map.new()
+  should.equal(map.get(m, "a"), Error(Nil))
+
+  map.set(m, "a", 1)
+  should.equal(map.get(m, "a"), Ok(1))
+
+  map.set(m, "a", 2)
+  should.equal(map.get(m, "a"), Ok(2))
+}