remove example test

tests/ExampleTest.php

@@ -1,23 +0,0 @@
-<?php
-
-namespace Tests;
-
-use Laravel\Lumen\Testing\DatabaseMigrations;
-use Laravel\Lumen\Testing\DatabaseTransactions;
-
-class ExampleTest extends TestCase
-{
-    /**
-     * A basic test example.
-     *
-     * @return void
-     */
-    public function test_that_base_endpoint_returns_a_successful_response()
-    {
-        $this->get('/');
-
-        $this->assertEquals(
-            $this->app->version(), $this->response->getContent()
-        );
-    }
-}