fix: rename test module to tests

examples/acceptance_tests/017/lib/tests.ak

@@ -0,0 +1,13 @@
+use aiken/builtin
+
+pub fn slice(bytes: ByteArray, start: Int, end: Int) -> ByteArray {
+  builtin.slice_bytearray(start, end, bytes)
+}
+
+pub fn take(bytes: ByteArray, n: Int) -> ByteArray {
+  slice(bytes, 0, n)
+}
+
+test take_1() {
+  take(#[1, 2, 3], 2) == #[1, 2]
+}