add tests repository

tests/test.php

@@ -0,0 +1,32 @@
+<?php
+class StackTest extends PHPUnit_Framework_TestCase
+{
+    public function testEmpty()
+    {
+        $stack = array();
+        $this->assertEmpty($stack);
+
+        return $stack;
+    }
+
+    /**
+     * @depends testEmpty
+     */
+    public function testPush(array $stack)
+    {
+        array_push($stack, 'foo');
+        $this->assertEquals('foo', $stack[count($stack)-1]);
+        $this->assertNotEmpty($stack);
+
+        return $stack;
+    }
+
+    /**
+     * @depends testPush
+     */
+    public function testPop(array $stack)
+    {
+        $this->assertEquals('foo', array_pop($stack));
+        $this->assertEmpty($stack);
+    }
+}