diff --git a/tests/src/Kernel/BraintreeApiIntegrationTest.php b/tests/src/Kernel/BraintreeApiIntegrationTest.php
new file mode 100644
index 0000000..fbe420d
--- /dev/null
+++ b/tests/src/Kernel/BraintreeApiIntegrationTest.php
@@ -0,0 +1,181 @@
+<?php
+
+namespace Drupal\Tests\commerce_braintree\Kernel;
+
+use Drupal\commerce_braintree\Plugin\Commerce\PaymentGateway\HostedFields;
+use Drupal\commerce_order\Entity\Order;
+use Drupal\commerce_payment\Entity\Payment;
+use Drupal\commerce_payment\Entity\PaymentGateway;
+use Drupal\commerce_payment\Entity\PaymentMethod;
+use Drupal\commerce_payment\Exception\InvalidRequestException;
+use Drupal\commerce_payment\Exception\InvalidResponseException;
+use Drupal\commerce_payment\Exception\SoftDeclineException;
+use Drupal\commerce_price\Price;
+use Drupal\profile\Entity\Profile;
+use Drupal\Tests\commerce\Kernel\CommerceKernelTestBase;
+
+class BraintreeApiIntegrationTest extends CommerceKernelTestBase {
+
+  public static $modules = [
+    'profile',
+    'entity_reference_revisions',
+    'state_machine',
+    'commerce_order',
+    'commerce_payment',
+    'commerce_braintree',
+  ];
+
+  /**
+   * The test gateway.
+   *
+   * @var \Drupal\commerce_payment\Entity\PaymentGateway
+   */
+  protected $gateway;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $this->installEntitySchema('profile');
+    $this->installEntitySchema('commerce_order');
+    $this->installEntitySchema('commerce_order_item');
+    $this->installEntitySchema('commerce_payment');
+    $this->installEntitySchema('commerce_payment_method');
+    $this->installConfig('commerce_order');
+    $this->installConfig('commerce_payment');
+
+    /** @var \Drupal\commerce_payment\Entity\PaymentGateway $gateway */
+    $gateway = PaymentGateway::create([
+      'id' => 'braintree',
+      'label' => 'Braintree',
+      'plugin' => 'braintree_hostedfields',
+    ]);
+    $gateway->getPlugin()->setConfiguration([
+      'merchant_id' => 'hy3tktc463w6g7pw',
+      'public_key' => 'fsspfgwhnm6by9gk',
+      'private_key' => '671d13c9dee5815425f954df590bfc98',
+      'merchant_account_id' => [
+        'USD' => 'commerceguys',
+      ],
+      'display_label' => 'Braintree',
+      'payment_method_types' => ['credit_card'],
+    ]);
+    $gateway->save();
+    $this->gateway = $gateway;
+  }
+
+  public function testGatewayConstruction() {
+    $plugin = $this->gateway->getPlugin();
+    $this->assertTrue($plugin instanceof HostedFields);
+  }
+
+  /**
+   * Tests creating a payment.
+   */
+  public function testCreatePayment() {
+    /** @var \Drupal\commerce_braintree\Plugin\Commerce\PaymentGateway\HostedFieldsInterface $gateway_plugin */
+    $gateway_plugin = $this->gateway->getPlugin();
+    $gateway_plugin->createPayment($this->generateTestPayment('10.00'));
+  }
+
+  /**
+   * Tests creating a payment, with invalid CVV error.
+   *
+   * @group debug
+   */
+  public function testCreatePaymentInsufficentFunds() {
+    $this->setExpectedException(SoftDeclineException::class, 'Insufficient Funds (2001 : Insufficient Funds)');
+    /** @var \Drupal\commerce_braintree\Plugin\Commerce\PaymentGateway\HostedFieldsInterface $gateway_plugin */
+    $gateway_plugin = $this->gateway->getPlugin();
+    $gateway_plugin->createPayment($this->generateTestPayment('2001.00'));
+    throw new \Exception('Charge should not have been successful.');
+  }
+
+  /**
+   * Tests creating a payment, with invalid CVV error.
+   *
+   * @group debug
+   */
+  public function testCreatePaymentProcessorDeclined() {
+    $this->setExpectedException(SoftDeclineException::class, 'Processor Declined (2101 : )');
+    /** @var \Drupal\commerce_braintree\Plugin\Commerce\PaymentGateway\HostedFieldsInterface $gateway_plugin */
+    $gateway_plugin = $this->gateway->getPlugin();
+    $gateway_plugin->createPayment($this->generateTestPayment('2101.00'));
+    throw new \Exception('Charge should not have been successful.');
+  }
+
+  public function testCreatePaymentRejectedConsumedNonce() {
+    $this->setExpectedException(InvalidRequestException::class, 'Cannot use a paymentMethodNonce more than once.');
+    /** @var \Drupal\commerce_braintree\Plugin\Commerce\PaymentGateway\HostedFieldsInterface $gateway_plugin */
+    $gateway_plugin = $this->gateway->getPlugin();
+    $gateway_plugin->createPayment($this->generateTestPayment('10.00', \Braintree_Test_Nonces::$consumed));
+  }
+
+  /**
+   * Generates a test payment to send over the Braintree gateway.
+   *
+   * @param string $amount
+   *   The test amount.
+   * @param string $nonce
+   *   The test nonce.
+   *
+   * @return \Drupal\commerce_payment\Entity\PaymentInterface The test payment.
+   * The test payment.
+   * @see https://developers.braintreepayments.com/reference/general/testing/php#test-amounts
+   */
+  protected function generateTestPayment($amount, $nonce = NULL) {
+    if ($nonce === NULL) {
+      $nonce = \Braintree_Test_Nonces::$transactable;
+    }
+
+    $user = $this->createUser();
+    $order = Order::create([
+      'type' => 'default',
+      'store_id' => $this->store->id(),
+      'state' => 'draft',
+      'mail' => 'text@example.com',
+      'uid' => $user->id(),
+      'ip_address' => '127.0.0.1',
+    ]);
+    $order->save();
+
+    /** @var \Drupal\profile\Entity\ProfileInterface $profile */
+    $profile = Profile::create([
+      'type' => 'customer',
+      'address' => [
+        'country_code' => 'US',
+        'postal_code' => '53177',
+        'locality' => 'Milwaukee',
+        'address_line1' => 'Pabst Blue Ribbon Dr',
+        'administrative_area' => 'WI',
+        'given_name' => 'Frederick',
+        'family_name' => 'Pabst',
+      ],
+      'uid' => $user->id(),
+    ]);
+    $profile->save();
+
+    /** @var \Drupal\commerce_payment\Entity\PaymentMethodInterface $payment_method */
+    $payment_method = PaymentMethod::create([
+      'type' => 'credit_card',
+      'payment_gateway' => $this->gateway->id(),
+      'uid' => $user->id(),
+      'remote_id' => $nonce,
+    ]);
+    $payment_method->setBillingProfile($profile);
+    $payment_method->setReusable(FALSE);
+    $payment_method->save();
+
+    $payment = Payment::create([
+      'state' => 'new',
+      'amount' => new Price($amount, 'USD'),
+      'payment_gateway' => $this->gateway->id(),
+      'order_id' => $order->id(),
+    ]);
+    $payment->payment_method = $payment_method;
+    return $payment;
+  }
+
+}