hush: reinstate hush_test, add testcases for process subst
diff --git a/shell/hush_test/hush-parsing/process_subst.right b/shell/hush_test/hush-parsing/process_subst.right
new file mode 100644
index 0000000..8f9ab9d
--- /dev/null
+++ b/shell/hush_test/hush-parsing/process_subst.right
@@ -0,0 +1,2 @@
+TESTzzBEST
+TEST$(echo zz)BEST