1 files changed, 22 insertions, 0 deletions
diff --git a/release/src/router/busybox/shell/hush_test/hush-vars/param_expand_alt.tests b/release/src/router/busybox/shell/hush_test/hush-vars/param_expand_alt.tests
new file mode 100755
index 00000000..dcdca86d
--- /dev/null
+++ b/release/src/router/busybox/shell/hush_test/hush-vars/param_expand_alt.tests
@@ -0,0 +1,22 @@
+# first try some invalid patterns (do in subshell due to parsing error)
+"$THIS_SH" -c 'echo ${+}  ; echo moo'
+"$THIS_SH" -c 'echo ${:+} ; echo moo'
+
+# now some funky ones
+echo _${#+} _${#:+}
+
+# now some valid ones
+set --
+echo _$1 _${1+} _${1:+} _${1+word} _${1:+word}
+
+set -- aaaa
+echo _$1 _${1+} _${1:+} _${1+word} _${1:+word}
+
+unset f
+echo _$f _${f+} _${f:+} _${f+word} _${f:+word}
+
+f=
+echo _$f _${f+} _${f:+} _${f+word} _${f:+word}
+
+f=fff
+echo _$f _${f+} _${f:+} _${f+word} _${f:+word}