dkim keys are needed for the test

src/mail.js

@@ -678,11 +678,11 @@ function addDnsRecords(domain, callback) {
     assert.strictEqual(typeof domain, 'string');
     assert.strictEqual(typeof callback, 'function');
 
-    if (process.env.BOX_ENV === 'test') return callback();
-
     var error = ensureDkimKeySync(domain);
     if (error) return callback(error);
 
+    if (process.env.BOX_ENV === 'test') return callback();
+
     var dkimKey = readDkimPublicKeySync(domain);
     if (!dkimKey) return callback(new MailError(MailError.INTERNAL_ERROR, new Error('Failed to read dkim public key')));