Add some trivial synchronous subprocess tests.

diff --git a/tests/runtime/test-syncproc.scm b/tests/runtime/test-syncproc.scm
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+++ b/tests/runtime/test-syncproc.scm
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+#| -*-Scheme-*-
+
+Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+    2006, 2007, 2008, 2009, 2010, 2011 Massachusetts Institute of
+    Technology
+
+This file is part of MIT/GNU Scheme.
+
+MIT/GNU Scheme is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+MIT/GNU Scheme is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with MIT/GNU Scheme; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
+USA.
+
+|#
+
+;;;; Tests of synchronous subprocess support
+
+(declare (usual-integrations))
+\f
+(define (shell command)
+  (run-shell-command command 'INPUT #f 'OUTPUT #f))
+
+(define-test 'SUBPROCESS-EXITED-ZERO
+  (lambda ()
+    (assert-eqv (shell ":") 0)))
+
+(define-test 'SUBPROCESS-EXITED-NONZERO
+  (lambda ()
+    (assert-eqv (shell "exit 1") 1)))
+
+(define-test 'SUBPROCESS-SIGNALLED
+  (lambda ()
+    (assert-error (lambda () (shell "kill $$"))
+                  (list condition-type:subprocess-signalled))))
+
+(define-test 'SUBPROCESS-STOPPED
+  (lambda ()
+    (assert-error
+     (lambda ()
+       ;; Run a subshell that will continue the parent shell just in
+       ;; case Scheme fails the test.
+       (shell "pid=$$; (sleep 2; kill -CONT $pid) & sleep 1; kill -STOP $pid"))
+     (list condition-type:subprocess-stopped))))