added test around is_sandbox

Author: avigoldman

tests/specs/test-sparkpost.class.php

@@ -0,0 +1,18 @@
+<?php
+/**
+* @package wp-sparkpost
+*/
+namespace WPSparkPost;
+
+class TestSparkPost extends \WP_UnitTestCase {
+    var $SparkPost;
+
+    function setUp() {
+        $this->SparkPost = new SparkPost();
+    }
+
+    function test_is_sandbox() {
+        $this->assertTrue(SparkPost::is_sandbox('testing@sparkpostbox.com'));
+        $this->assertFalse(SparkPost::is_sandbox('testing@mydoman.com'));
+    }
+}