added --enable-tests option which will be off during distcheck

as we have document-saver test failing always

Makefile.am

@@ -1,7 +1,11 @@
 ## Process this file with automake to produce Makefile.in
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
-SUBDIRS = pluma pixmaps po data plugin-loaders plugins docs tests help
+SUBDIRS = pluma pixmaps po data plugin-loaders plugins docs help
+
+if ENABLE_TESTS
+    SUBDIRS += tests
+endif
 
 distuninstallcheck_listfiles = find . -type f -print
 
@@ -51,7 +55,7 @@ MAINTAINERCLEANFILES = 		\
 	m4/lt~obsolete.m4	\
 	`find "$(srcdir)" -type f -name Makefile.in -print`
 
-DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc
+DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --disable-tests
 
 dist-hook:
 	@if test -d "$(srcdir)/.git"; \

configure.ac

@@ -353,6 +353,13 @@ if test "x$enable_deprecations" = "xyes"; then
    AC_SUBST(DISABLE_DEPRECATED_CFLAGS)
 fi
 
+AC_ARG_ENABLE([tests],
+	AS_HELP_STRING([--enable-tests], [Enable the tests]),
+	[enable_tests=$enableval],
+	[enable_tests=yes])
+
+AM_CONDITIONAL(ENABLE_TESTS, test x$enable_tests = xyes)
+
 PLUGIN_LIBTOOL_FLAGS="-module -avoid-version"
 LOADER_LIBTOOL_FLAGS="-module -avoid-version"
 
@@ -425,6 +432,7 @@ Configuration:
 	Python Plugins Support: $enable_python
 	Spell Plugin enabled:	$enable_enchant
 	Gvfs metadata enabled:	$enable_gvfs_metadata
+	Tests enabled:		$enable_tests
 "
 
 if expr ${PLUMA_MINOR_VERSION} % 2 > /dev/null; then