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diff --git a/test/snapshots/shellset.snap b/test/snapshots/shellset.snap
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+# The Shell builtin names the binary the NEXT terminal execs. What is pinned
+# here is the case that has to hold on a machine you did not set up: the name
+# resolves to nothing, and the pane opens anyway.
+#
+# That is not a corner — it is the DEFAULT's failure mode. pardes ships
+# `Shell fish` as the default, and a box without fish must still get a working
+# shell rather than a pane whose child dies at exec and shows one EOF. So the
+# lookup falls back, and this is the proof: a name nothing resolves to, and the
+# new pane still greets and lists like any other.
+#
+# The rest of the feature is unit-tested rather than pinned here, on purpose.
+# Which family a binary belongs to, what argv each one gets and where the
+# lookup searches are in shell_bin.zig's own tests; the fish end of it cannot
+# be a golden at all, because fish's prompt carries a hostname and its greeting
+# a version number. (Every script in this suite runs bash, pinned through an
+# ordinary config file the harness writes — see snapshot.zig.)
+file cmd.txt Shell zznosuchshell
+file zmarkfile.txt x
+start 20 90 cmd.txt
+wait 8000 Shell zznosuchshell
+stable 700 20000
+snap boot
+# execute the line the way you would run any command: select it, Tab. Nothing
+# on any machine is installed under that name, so the resolver runs out of
+# directories. (A file pane, so the line executed is the line you can see —
+# typing into a terminal's overlay would leave `gg`/`x` selecting its output.)
+key g g
+key x
+stable 400 5000
+key tab
+stable 700 15000
+# NOTHING happened on screen, and that is the assertion: a name the builtin
+# parser does not know is a command line, so it would have forked a terminal
+# for this directory and printed `Shell: command not found` into it (that is
+# cmdword.snap's contract). One pane, no error — `Shell` was consumed as a
+# builtin and its argument went with it.
+snap builtin-ran
+# a new terminal, which asks for a shell that is not there. It gets the
+# fallback: the pane greets, `ls` runs, and its output is on screen.
+key space c n
+wait 15000 zmarkfile.txt
+stable 700 20000
+snap fallback-shell