Validation Package Testing

- Added More Unit Tests to Validation Classes
- Updated Logic accordingly

tests/PayPal/Test/Validation/ArgumentValidatorTest.php

@@ -0,0 +1,51 @@
+<?php
+namespace PayPal\Test\Validation;
+
+use PayPal\Validation\ArgumentValidator;
+
+class ArgumentValidatorTest extends \PHPUnit_Framework_TestCase
+{
+
+    public static function positiveProvider()
+    {
+        return array(
+            array("1"),
+            array("something here"),
+            array(1),
+            array(array(1,2,3)),
+            array(0.123),
+            array(true),
+            array(false),
+            array(array()),
+        );
+    }
+
+    public static function invalidProvider()
+    {
+        return array(
+            array(null),
+            array(''),
+            array('     ')
+        );
+    }
+
+    /**
+     *
+     * @dataProvider positiveProvider
+     */
+    public function testValidate($input)
+    {
+        $this->assertTrue(ArgumentValidator::validate($input, "Name"));
+    }
+
+    /**
+     *
+     * @dataProvider invalidProvider
+     * @expectedException \InvalidArgumentException
+     */
+    public function testInvalidDataValidate($input)
+    {
+        $this->assertTrue(ArgumentValidator::validate($input, "Name"));
+    }
+
+}