add tests

.gitignore

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+/vendor
+/.env
+composer.phar
+composer.lock
+.DS_Store
+Thumbs.db
+/phpunit.xml

.travis.yml

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+language: php
+
+php:
+  - 5.6
+  - 7.0
+  - 7.1
+
+sudo: false
+
+install: travis_retry composer install --no-interaction --prefer-source
+
+script: vendor/bin/phpunit --verbose

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) <Taylor Otwell>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

tests/TNTSearchEngineTest.php

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+<?php
+
+use TeamTNT\Scout\Engines\TNTSearchEngine;
+use Illuminate\Database\Eloquent\Collection;
+
+class AlgoliaEngineTest extends PHPUnit_Framework_TestCase
+{
+    public function tearDown()
+    {
+        Mockery::close();
+    }
+}
+
+class TNTSearchEngineTestModel
+{
+    public function searchableAs()
+    {
+        return 'table';
+    }
+
+    public function getKey()
+    {
+        return 1;
+    }
+
+    public function toSearchableArray()
+    {
+        return ['id' => 1];
+    }
+}