Re-adding the QUnit submodule file.

diff --git a/test/qunit b/test/qunit
new file mode 160000 (submodule)
index 0000000..f55bf2d
--- /dev/null
+++ b/test/qunit
@@ -0,0 +1 @@
+Subproject commit f55bf2d53f6c0b18dd8f1addc5df4e386da5344f