tests: move to subdir, move to meson

De-clutter the source directories a bit. Ensure tests build with meson, and
remove from autotools in a few places (no need to do things twice).

lib/tests/test-mu-common.hh

@@ -0,0 +1,58 @@
+/*
+** Copyright (C) 2008-2013 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+**
+** This program 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 3, or (at your option) any
+** later version.
+**
+** This program 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 this program; if not, write to the Free Software Foundation,
+** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+**
+*/
+
+#ifndef __TEST_MU_COMMON_H__
+#define __TEST_MU_COMMON_H__
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+/**
+ * get a dir name for a random temporary directory to do tests
+ *
+ * @return a random dir name, g_free when it's no longer needed
+ */
+char* test_mu_common_get_random_tmpdir(void);
+
+/**
+ * set the output to /dev/null
+ *
+ */
+void black_hole(void);
+
+/**
+ * set the timezone
+ *
+ * @param tz timezone
+ *
+ * @return the old timezone
+ */
+const char* set_tz(const char* tz);
+
+/**
+ * switch the locale to en_US.utf8, return TRUE if it succeeds
+ *
+ * @return TRUE if the switch succeeds, FALSE otherwise
+ */
+gboolean set_en_us_utf8_locale(void);
+
+G_END_DECLS
+
+#endif /*__TEST_MU_COMMON_H__*/