Added the migrations to the base test case.

tests/Unit/TestCase.php

@@ -49,5 +49,27 @@ protected function getEnvironmentSetUp($app)
             'driver'   => 'sqlite',
             'database' => ':memory:',
         ]);
+
+        $this->migrateDatabase();
+    }
+
+    /**
+     * Include each of the migrations and migrate them to
+     * finish preparing the database for running the
+     * tests.
+     */
+    private function migrateDatabase(): void
+    {
+        include_once __DIR__.'/../../database/migrations/2019_12_22_015115_create_short_urls_table.php';
+        include_once __DIR__.'/../../database/migrations/2019_12_22_015214_create_short_url_visits_table.php';
+        include_once __DIR__.'/../../database/migrations/2020_02_11_224848_update_short_url_table_for_version_two_zero_zero.php';
+        include_once __DIR__.'/../../database/migrations/2020_02_12_008432_update_short_url_visits_table_for_version_two_zero_zero.php';
+        include_once __DIR__.'/../../database/migrations/2020_04_10_224546_update_short_url_table_for_version_three_zero_zero.php';
+
+        (new \CreateShortUrlsTable)->up();
+        (new \CreateShortUrlVisitsTable)->up();
+        (new \UpdateShortURLTableForVersionTwoZeroZero)->up();
+        (new \UpdateShortURLVisitsTableForVersionTwoZeroZero)->up();
+        (new \UpdateShortURLTableForVersionThreeZeroZero)->up();
     }
 }