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The Makefile runs each test under env -i, so SHELL is unset and the server's default-shell is the login shell from the password file. It runs every pane that has no command, as a login shell, and every pane command given as one string, with -c. zsh takes HOME from the password file when it is unset, so it reads the user's startup files and history. Twenty-six tests type a command into such a pane and give it a fixed time: twenty-five type an attach to a second server and sleep for a second, and session-ops.sh types a script and waits five seconds for it. When the login shell is slow to give a prompt, the checks run before the command has. zsh, for one, waits until a lock on a non-empty history file is ten seconds old. Set SHELL=/bin/sh in the environment the tests run in.
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