echo-wait: fix tests #588

Job	Run time
homebrew-macos-test	14m 9s
distro-test (ubuntu:latest)	4m 35s
fresh-macos-test	47m 22s
login-shells-and-linting	4m 33s
distro-test (fedora:latest)	7m 32s
distro-test (debian:latest)	4m 24s
distro-test (alpine:latest)	4m 30s
distro-test (manjarolinux/base)	4m 26s
distro-test (opensuse/leap)	8m 2s
distro-test (opensuse/tumbleweed)	5m 9s
distro-test (kalilinux/kali-rolling)	5m 2s
	1h 49m 44s

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