+res=$(printf 'foo\n' | zpm-hash)
+okstreq $res b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c "foo"
+
+res=$(printf 'foo\n' | zpm-hash -)
+okstreq $res b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c "foo stdin"
+
+stest() {
+ res=$(printf '%s' $1 | zpm-hash -)
+ okstreq "$res" "$2" "${1:-empty string}"
+}
+
+stest abc ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
+stest '' e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+stest 'abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq' '248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1'