diff --git a/tests/map.npp b/tests/map.npp
new file mode 100644
index 0000000..6af0b46
--- /dev/null
+++ b/tests/map.npp
@@ -0,0 +1,8 @@
+# Map type operator and function tests
+
+a = [:]
+
+println("to_str")
+println(a)
+println(['a': 1])
+println(['b': 2 + 2])
diff --git a/tests/map.npp.expect b/tests/map.npp.expect
new file mode 100644
index 0000000..1aac46a
--- /dev/null
+++ b/tests/map.npp.expect
@@ -0,0 +1,4 @@
+to_str
+[:]
+['a': 1]
+['b': 4]