setup database config for testing

config/database.php

@@ -0,0 +1,42 @@
+<?php
+
+return [
+    'default' => env('DB_CONNECTION', 'sqlite'),
+    'connections' => [
+        'sqlite' => [
+            'driver' => 'sqlite',
+            'url' => env('DATABASE_URL'),
+            'database' => env('DB_DATABASE', database_path('default.sqlite')),
+            'prefix' => '',
+            'foreign_key_constraints' => env('DB_FOREIGN_KEYS', true),
+        ],
+        'mysql' => [
+            'driver' => 'mysql',
+            'url' => env('DATABASE_URL'),
+            'host' => env('DB_HOST', '127.0.0.1'),
+            'port' => env('DB_PORT', '3306'),
+            'database' => env('DB_DATABASE', 'default_db'),
+            'username' => env('DB_USERNAME', 'default_user'),
+            'password' => env('DB_PASSWORD', ''),
+            'unix_socket' => env('DB_SOCKET', ''),
+            'charset' => 'utf8mb4',
+            'collation' => 'utf8mb4_unicode_ci',
+            'prefix' => '',
+            'prefix_indexes' => true,
+            'strict' => true,
+            'engine' => null,
+            'options' => extension_loaded('pdo_mysql') ? array_filter([
+                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
+            ]) : [],
+        ],
+        'sqlite_testing' => [
+            'driver'   => 'sqlite',
+            'database' => ':memory:',
+            'prefix'   => '',
+        ]
+    ],
+    'fetch' => PDO::FETCH_CLASS, // Returns DB objects in an array format.
+    'migrations' => 'migrations'
+];
+
+?>

phpunit.xml

@@ -21,6 +21,8 @@
     <php>
         <env name="APP_ENV" value="testing"/>
         <env name="CACHE_DRIVER" value="array"/>
+        <env name="SESSION_DRIVER" value="array"/>
         <env name="QUEUE_CONNECTION" value="sync"/>
+        <env name="DB_CONNECTION" value="sqlite_testing" />
     </php>
 </phpunit>