msh: create testsuite (based on hush one)
hush: add TODO (doesn't know ":" command)

diff --git a/shell/msh_test/msh-bugs/shift.tests b/shell/msh_test/msh-bugs/shift.tests
new file mode 100755
index 0000000..53ef249
--- /dev/null
+++ b/shell/msh_test/msh-bugs/shift.tests
@@ -0,0 +1,14 @@
+if test $# = 0; then
+    exec "$THIS_SH" $0 abc "d e" 123
+fi
+echo $0 $1 $2
+shift
+echo $0 $1 $2
+shift 999
+echo $0 $1 $2
+shift 2
+echo $0 $1 $2
+shift 2
+echo $0 $1 $2
+shift
+echo $0 $1 $2