ensure precedence of local modules when testing executables

Makefile.am

@@ -17,4 +17,5 @@ EXTRA_DIST = \
 	README.md \
 	CHANGES.md \
 	t/edugain.xml \
+	t/lib.pm \
 	$(TESTS)

t/cli.t

@@ -214,7 +214,7 @@ sub run_executable {
 
     my @args = $args ? split(/\s+/, $args) : ();
     run(
-        [ $EXECUTABLE_NAME, '-I', 'lib', 'bin/' . $executable, @args ],
+        [ $EXECUTABLE_NAME, '-I', 'lib', '-I', 't', 'bin/' . $executable, @args ],
         \my ($in, $out, $err)
     );
     return ($out, $err, $CHILD_ERROR >> 8);

t/lib.pm

+package lib;
+
+# this module overrides the system one, in order to ensure precedence of local
+# module version specificed on command-line over those already installed
+
+sub import {
+    # do nothing
+};
+
+1;