tests: be robust to concurrency

* tests/defs.in: Let each test work in its own temp dir.

* tests/cmp.test, tests/trace.test, tests/overflow.test: cmp is quite
useless, use diff.

tests/cmp.test

 #! /bin/sh
-# Copyright (C) 2012  EPITA Research and Development Laboratory (LRDE)
+# Copyright (C) 2012-2016  EPITA Research and Development Laboratory (LRDE)
 #
 # This file is part of HAVM.
 #
@@ -18,13 +18,11 @@
 
 . ./tests/defs || exit 1
 
-set -e
-
 HAVM_pass --trace $srcdir/tests/cmp.lir
-cmp stdout $srcdir/tests/cmp.out
+diff -u $srcdir/tests/cmp.out stdout
 test -s stderr
 
 HAVM_pass --trace=3 $srcdir/tests/cmp.lir 3>stdtrc
-cmp stdout $srcdir/tests/cmp.out
+diff -u $srcdir/tests/cmp.out stdout
 test ! -s stderr
 test   -s stdtrc

tests/defs.in

 # -*- shell-script -*-
 # @configure_input@
 #
-# Copyright (C) 2006, 2012  EPITA Research and Development Laboratory (LRDE)
+# Copyright (C) 2006-2016  EPITA Research and Development Laboratory (LRDE)
 #
 # This file is part of HAVM.
 #
@@ -79,11 +79,13 @@ case "$srcdir" in
     ;;
 esac
 
-chmod -R a+rwx testSubDir > /dev/null 2>&1
-rm -rf testSubDir > /dev/null 2>&1
-mkdir testSubDir
+base=$(basename "$0" ".test")
+testdir=$base.dir
+chmod -R a+rwx "$testdir" > /dev/null 2>&1
+rm -rf "$testdir" > /dev/null 2>&1
+mkdir "$testdir"
 
-cd ./testSubDir
+cd ./"$testdir"
 
 echo "=== Running test $0"
 

tests/nestedseq.test

 #! /bin/sh
-# Copyright (C) 2014  EPITA Research and Development Laboratory (LRDE)
+# Copyright (C) 2014-2016  EPITA Research and Development Laboratory (LRDE)
 #
 # This file is part of HAVM.
 #

tests/overflow.test

 #! /bin/sh
-# Copyright (C) 2014  EPITA Research and Development Laboratory (LRDE)
+# Copyright (C) 2014-2016  EPITA Research and Development Laboratory (LRDE)
 #
 # This file is part of HAVM.
 #
@@ -21,10 +21,10 @@
 set -e
 
 HAVM_pass --trace $srcdir/tests/overflow.lir
-cmp stdout $srcdir/tests/overflow.out
+diff -u $srcdir/tests/overflow.out stdout
 test -s stderr
 
 HAVM_pass --trace=3 $srcdir/tests/overflow.lir 3>stdtrc
-cmp stdout $srcdir/tests/overflow.out
+diff -u $srcdir/tests/overflow.out stdout
 test ! -s stderr
 test   -s stdtrc

tests/trace.test

 #! /bin/sh
-# Copyright (C) 2006  EPITA Research and Development Laboratory (LRDE)
+# Copyright (C) 2006-2016  EPITA Research and Development Laboratory (LRDE)
 #
 # This file is part of HAVM.
 #
@@ -21,10 +21,10 @@
 set -e
 
 HAVM_pass --trace $srcdir/tests/fact.lir
-cmp stdout $srcdir/tests/fact.out
+diff -u $srcdir/tests/fact.out stdout
 test -s stderr
 
 HAVM_pass --trace=3 $srcdir/tests/fact.lir 3>stdtrc
-cmp stdout $srcdir/tests/fact.out
+diff -u $srcdir/tests/fact.out stdout
 test ! -s stderr
 test   -s stdtrc