getcwd: enhance tests The existing getcwd was weak, and only tested things guaranteed by the new getcwd-lgpl. Move those tests into a new file and strengthen them slightly (such as guaranteeing the ERANGE error for a non-zero but too-small size). Then copy the m4 tests for PATH_MAX failures into the GPL getcwd tests, to prove that our replacement really is fixing the things that cause us to reject the system getcwd as non-robust. * tests/test-getcwd-lgpl.c: New file, taken from... * tests/test-getcwd.c: ...old contents. Rewrite this file to repeat long path stress tests from m4 probe. * modules/getcwd-lgpl-tests: New module. * modules/getcwd-tests (Depends-on): Depend on lgpl tests. * m4/getcwd-abort-bug.m4: Update comment. * m4/getcwd-path-max.m4: Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>

new file mode 100644
--- /dev/null
+++ b/modules/getcwd-lgpl-tests
@@ -0,0 +1,12 @@
+Files:
+tests/test-getcwd-lgpl.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-getcwd-lgpl
+check_PROGRAMS += test-getcwd-lgpl