Customer: add show customer

Author: glaubinix

README.md

@@ -42,6 +42,12 @@ $customers = $client->customers()->all();
 ```
 Returns an array of customers.
 
+##### Show a customer
+```php
+$customerId = 42;
+$customer = $client->customers()->show($customerId);
+```
+Returns a single customer.
 
 ##### Create a customer
 ```php

src/Api/Customers.php

@@ -11,6 +11,11 @@ public function all()
         return $this->get('/customers/');
     }
 
+    public function show($customerId)
+    {
+        return $this->get(sprintf('/customers/%s/', $customerId));
+    }
+
     public function create($name)
     {
         return $this->post('/customers/', ['name' => $name]);

src/Client.php

@@ -26,6 +26,7 @@ public function __construct(HttpPluginClientBuilder $httpClientBuilder = null, $
 
         $builder->addPlugin(new Plugin\AddHostPlugin(UriFactoryDiscovery::find()->createUri($privatePackagistUrl)));
         $builder->addPlugin(new PathPrepend('/api'));
+        $builder->addPlugin(new Plugin\RedirectPlugin());
         $builder->addPlugin(new Plugin\HeaderDefaultsPlugin([
             'User-Agent' => 'php-private-packagist-api (https://github.com/packagist/private-packagist-api-client)',
         ]));

tests/Api/CustomersTest.php

@@ -24,6 +24,24 @@ public function testAll()
         $this->assertSame($expected, $api->all());
     }
 
+    public function testShow()
+    {
+        $expected = [
+            'id' => 1,
+            'type' => 'composer-repo',
+            'name' => $name = 'Customer',
+        ];
+
+        /** @var Customers&\PHPUnit_Framework_MockObject_MockObject $api */
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with($this->equalTo('/customers/1/'))
+            ->will($this->returnValue($expected));
+
+        $this->assertSame($expected, $api->show(1));
+    }
+
     public function testCreate()
     {
         $expected = [