t/test-lib.sh: resolve symlinks in working directory, for pathname comparisons

Without this, some tests will fail because they compare command output
of subprocesses (such as git) with $PWD -- but subprocesses have the
physical path as their working directory, whereas $PWD contains the
symlinked path.  This fixes it.

Signed-off-by: Lea Wiemann <LeWiemann@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/test-lib.sh

@@ -419,7 +419,9 @@ rm -fr "$test" || {
 }
 
 test_create_repo "$test"
-cd "$test" || exit 1
+# Use -P to resolve symlinks in our working directory so that the cwd
+# in subprocesses like git equals our $PWD (for pathname comparisons).
+cd -P "$test" || exit 1
 
 this_test=$(expr "./$0" : '.*/\(t[0-9]*\)-[^/]*$')
 for skp in $GIT_SKIP_TESTS