diff --git a/examples/tests/e/aiken.toml b/examples/tests/e/aiken.toml
new file mode 100644
index 00000000..eeade47c
--- /dev/null
+++ b/examples/tests/e/aiken.toml
@@ -0,0 +1,2 @@
+name = "test_e"
+version = "0.0.0"
diff --git a/examples/tests/e/lib/main.ak b/examples/tests/e/lib/main.ak
new file mode 100644
index 00000000..ce9644a7
--- /dev/null
+++ b/examples/tests/e/lib/main.ak
@@ -0,0 +1,16 @@
+use aiken/builtin.{head_list}
+
+pub fn head(xs: List<a>) -> Option<a> {
+  when xs is {
+    [] -> None
+    _ -> Some(head_list(xs))
+  }
+}
+
+test head_1() {
+  head([1, 2, 3]) == Some(1)
+}
+
+test head_2() {
+  head([]) == None
+}