(rename unit folder back as Unit)

tests/Unit/Billing/FakePaymentGatewayTest.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Tests\Unit\Billing;
+
+use Tests\TestCase;
+use App\Billing\FakePaymentGateway;
+
+class FakePaymentGatewayTest extends TestCase
+{
+    use PaymentGatewayContractTests;
+
+    protected function getPaymentGateway()
+    {
+        return new FakePaymentGateway;
+    }
+
+    /** @test */
+    function running_a_hook_before_the_first_charge()
+    {
+        $paymentGateway = new FakePaymentGateway;
+        $timesCallbackRan = 0;
+
+        $paymentGateway->beforeFirstCharge(function ($paymentGateway) use (&$timesCallbackRan) {
+            $timesCallbackRan++;
+            $paymentGateway->charge(2500, $paymentGateway->getValidTestToken());
+            $this->assertEquals(2500, $paymentGateway->totalCharges());
+        });
+
+        $paymentGateway->charge(2500, $paymentGateway->getValidTestToken());
+        $this->assertEquals(1, $timesCallbackRan);
+        $this->assertEquals(5000, $paymentGateway->totalCharges());
+    }
+}

tests/Unit/Billing/PaymentGatewayContractTests.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Tests\Unit\Billing;
+
+use App\Billing\PaymentFailedException;
+
+trait PaymentGatewayContractTests
+{
+    abstract protected function getPaymentGateway();
+
+    /** @test */
+    function charges_with_a_valid_payment_token_are_successful()
+    {
+        $paymentGateway = $this->getPaymentGateway();
+
+        $newCharges = $paymentGateway->newChargesDuring(function ($paymentGateway) {
+            $paymentGateway->charge(2500, $paymentGateway->getValidTestToken());
+        });
+
+        $this->assertCount(1, $newCharges);
+        $this->assertEquals(2500, $newCharges->map->amount()->sum());
+    }
+
+    /** @test */
+    function can_get_details_about_a_successful_charge()
+    {
+        $paymentGateway = $this->getPaymentGateway();
+
+        $charge = $paymentGateway->charge(2500, $paymentGateway->getValidTestToken($paymentGateway::TEST_CARD_NUMBER));
+
+        $this->assertEquals(substr($paymentGateway::TEST_CARD_NUMBER, -4), $charge->cardLastFour());
+        $this->assertEquals(2500, $charge->amount());
+    }
+
+    /** @test */
+    function charges_with_an_invalid_payment_token_fail()
+    {
+        $paymentGateway = $this->getPaymentGateway();
+
+        $newCharges = $paymentGateway->newChargesDuring(function ($paymentGateway) {
+            try {
+                $paymentGateway->charge(2500, 'invalid-payment-token');
+            } catch (PaymentFailedException $e) {
+                return;
+            }
+
+            $this->fail("Charging with an invalid payment token did not throw a PaymentFailedException.");
+        });
+
+        $this->assertCount(0, $newCharges);
+    }
+
+    /** @test */
+    function can_fetch_charges_created_during_a_callback()
+    {
+        $paymentGateway = $this->getPaymentGateway();
+        $paymentGateway->charge(2000, $paymentGateway->getValidTestToken());
+        $paymentGateway->charge(3000, $paymentGateway->getValidTestToken());
+
+        $newCharges = $paymentGateway->newChargesDuring(function ($paymentGateway) {
+            $paymentGateway->charge(4000, $paymentGateway->getValidTestToken());
+            $paymentGateway->charge(5000, $paymentGateway->getValidTestToken());
+        });
+
+        $this->assertCount(2, $newCharges);
+        $this->assertEquals([5000, 4000], $newCharges->map->amount()->all());
+    }
+}

tests/Unit/Billing/StripePaymentGatewayTest.php

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+<?php
+
+namespace Tests\Unit\Billing;
+
+use Tests\TestCase;
+use App\Billing\StripePaymentGateway;
+
+/**
+ * @group integration
+ */
+class StripePaymentGatewayTest extends TestCase
+{
+    use PaymentGatewayContractTests;
+
+    protected function getPaymentGateway()
+    {
+        return new StripePaymentGateway(config('services.stripe.secret'));
+    }
+}