[spec/sh-usage] Forgot this file in the last commit.

spec/sh-usage.test.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+#
+# Usage:
+#   ./sh-usage.test.sh <function name>
+
+#### sh -c
+$SH -c 'echo hi'
+## stdout: hi
+## status: 0
+
+#### empty -c input
+# had a bug here
+$SH -c ''
+## stdout-json: ""
+## status: 0
+
+#### empty stdin
+# had a bug here
+echo -n '' | $SH
+## stdout-json: ""
+## status: 0
+
+#### args are passed
+$SH -c 'argv.py "$@"' dummy a b
+## stdout: ['a', 'b']
+
+#### args that look like flags are passed after script
+script=$TMP/sh1.sh
+echo 'argv.py "$@"' > $script
+chmod +x $script
+$SH $script --help --help -h
+## stdout: ['--help', '--help', '-h']
+
+#### args that look like flags are passed after -c
+$SH -c 'argv.py "$@"' --help --help -h
+## stdout: ['--help', '-h']
+
+#### exit with explicit arg
+exit 42
+## status: 42
+
+#### exit with no args
+false
+exit
+## status: 1