diff --git a/Tests/.htaccess b/Tests/.htaccess
new file mode 100644
index 0000000..8d2f256
--- /dev/null
+++ b/Tests/.htaccess
@@ -0,0 +1 @@
+deny from all
diff --git a/Tests/TESTS b/Tests/TESTS
new file mode 100755
index 0000000..6957b34
--- /dev/null
+++ b/Tests/TESTS
@@ -0,0 +1,12 @@
+#!/bin/bash
+#To run the tests, you need "phpunit" software.
+# All the documentation is here :
+# phpunit.de/manual/current/en/writing-tests-for-phpunit.html
+
+#From the root dir of the project, run the tests like : 
+cd `dirname $0`/..
+phpunit --bootstrap Tests/autoload.php Tests/test*
+
+# You can run specific test with :
+# cd `dirname $0`/..
+# phpunit --bootstrap Tests/autoload.php Tests/testXXXXXXX.php
diff --git a/Tests/autoload.php b/Tests/autoload.php
new file mode 100644
index 0000000..3ed1e23
--- /dev/null
+++ b/Tests/autoload.php
@@ -0,0 +1,6 @@
+<?php
+// Autoload
+spl_autoload_register(function ($class) {
+  @include $class . '.php';
+});
+
diff --git a/Tests/test_outputjson.php b/Tests/test_outputjson.php
new file mode 100644
index 0000000..ba7c6b4
--- /dev/null
+++ b/Tests/test_outputjson.php
@@ -0,0 +1,24 @@
+<?php
+class test_outputjson extends PHPUnit_Framework_TestCase
+{
+  public function testoutputjson1 ()
+  {
+    $this->expectOutputString("\"\"");
+    $output = new outputjson ();
+    $output->out ("");
+  }  
+
+  public function testoutputjson2 ()
+  {
+    $this->expectOutputString("\"string\"");
+    $output = new outputjson ();
+    $output->out ("string");
+  }
+
+  public function testoutputjson3 ()
+  {
+    $this->expectOutputString("[1,2,3]");
+    $output = new outputjson ();
+    $output->out (array (1,2,3));
+  }
+}