First commit of Codeception files

tests/api/ClientCredentialsCept.php

@@ -0,0 +1,17 @@
+<?php
+$I = new ApiTester($scenario);
+$I->wantTo('get an access token using the client credentials grant');
+$I->sendPOST(
+    'access_token',
+    [
+        'grant_type'    => 'client_credentials',
+        'client_id'     => 'myawesomeapp',
+        'client_secret' => 'abc123',
+        'scope'         => 'basic'
+    ]
+);
+$I->canSeeResponseCodeIs(200);
+$I->canSeeResponseIsJson();
+$I->seeResponseJsonMatchesJsonPath('$.token_type');
+$I->seeResponseJsonMatchesJsonPath('$.expires_in');
+$I->seeResponseJsonMatchesJsonPath('$.access_token');

tests/api/_bootstrap.php

@@ -0,0 +1,2 @@
+<?php
+// Here you can initialize variables that will be available to your tests