Laravel 5 Travis CI config

.env.travis

APP_ENV=testing
APP_KEY=SomeRandomString

DB_CONNECTION=testing
DB_TEST_USERNAME=root
DB_TEST_PASSWORD=

CACHE_DRIVER=array
SESSION_DRIVER=array
QUEUE_DRIVER=sync

.travis.yml

language: php

php:
  - 5.6

before_script:
  - cp .env.travis .env
  - mysql -e 'create database homestead_test;'
  - composer self-update
  - composer install --no-interaction

script:
  - vendor/bin/phpunit

database.php

<?php

return [

    //...

    'default' => env('DB_CONNECTION', 'mysql'),

    //...

    'connections' => [

        'mysql' => [
            'driver'    => 'mysql',
            'host'      => env('DB_HOST', 'localhost'),
            'database'  => env('DB_DATABASE', 'homestead'),
            'username'  => env('DB_USERNAME', 'homestead'),
            'password'  => env('DB_PASSWORD', 'secret'),
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
            'strict'    => false,
        ],

        'testing' => [
            'driver'    => 'mysql',
            'host'      => env('DB_TEST_HOST', 'localhost'),
            'database'  => env('DB_TEST_DATABASE', 'homestead_test'),
            'username'  => env('DB_TEST_USERNAME', 'homestead'),
            'password'  => env('DB_TEST_PASSWORD', 'secret'),
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
            'strict'    => false,
        ],

    ],

    //...

];

phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit backupGlobals="false"
         backupStaticAttributes="false"
         bootstrap="bootstrap/autoload.php"
         colors="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false"
         syntaxCheck="false">
    <testsuites>
        <testsuite name="Application Test Suite">
            <directory>./tests/</directory>
        </testsuite>
    </testsuites>
    <filter>
        <whitelist>
            <directory suffix=".php">app/</directory>
        </whitelist>
    </filter>
    <php>
        <env name="APP_ENV" value="testing"/>
        <env name="DB_CONNECTION" value="testing"/>
        <env name="CACHE_DRIVER" value="array"/>
        <env name="SESSION_DRIVER" value="array"/>
        <env name="QUEUE_DRIVER" value="sync"/>
    </php>
</phpunit>

I'm using SQLite as service may you show me how my .travis.yml should look like ?