Adding old unit tests to test suite.

These tests are copied straight over. They'll still run, but they're
using the old system.

Change-Id: If494519e52ddf858a9febfc55bdae830468cb3c8
diff --git a/test/013-math2/expected.txt b/test/013-math2/expected.txt
new file mode 100644
index 0000000..d36c468
--- /dev/null
+++ b/test/013-math2/expected.txt
@@ -0,0 +1 @@
+a:32003