Add a simple regression test framework.
diff --git a/libacc/tests/hello.c b/libacc/tests/hello.c
new file mode 100644
index 0000000..585ce6c
--- /dev/null
+++ b/libacc/tests/hello.c
@@ -0,0 +1,3 @@
+main(a,b) {
+    printf("Hello, world\n");
+}