Shell: Add test for 37d5e3e0df6 / #3073

Shell/Tests/sigpipe.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# `head -n 1` should close stdout of the `Shell -c` command, which means the
+# second echo should exit unsuccessfully and sigpipe.sh.out should not be
+# created.
+rm -f sigpipe.sh.out
+
+# FIXME: It'd be nice if there was a way to create a subshell that makes
+# fewer assumptions about cwd and the build directory name.
+Build/Meta/Lagom/shell -c 'echo foo && echo bar && echo baz > sigpipe.sh.out' | head -n 1 > /dev/null
+
+# Failing commands don't make the test fail, just an explicit `exit 1` does.
+# So the test only fails if sigpipe.sh.out exists (since then `exit 1` runs),
+# not if the `test` statement returns false.
+test -e sigpipe.sh.out && exit 1