add Apps endpoint get /repos/:owner/:repo/installation

Author: jamiehuson

lib/Github/Api/Apps.php

@@ -79,6 +79,20 @@ public function getInstallationForOrganization($org)
         return $this->get('/org/'.rawurldecode($org).'/installation');
     }
 
+    /**
+     * Get an installation of the application for a repository
+     *
+     * @link https://developer.github.com/v3/apps/#get-a-repository-installation
+     *
+     * @param $owner the owner of a repository
+     * @param $repo the name of the repository
+     * @return array
+     */
+    public function getInstallationForRepo($owner, $repo)
+    {
+        return $this->get('/repos/'.rawurldecode($owner).'/'.rawurldecode($repo).'/installation');
+    }
+
     /**
      * Delete an installation of the application
      *

test/Github/Tests/Api/AppTest.php

@@ -72,6 +72,22 @@ public function shouldGetInstallationForOrganization()
         $this->assertEquals($result, $api->getInstallationForOrganization('1234'));
     }
 
+    /**
+     * @test
+     */
+    public function shouldGetInstallationForRepo()
+    {
+        $result = ['installation1'];
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with('/repos/MyOrg/MyRepo/installation')
+            ->willReturn($result);
+
+        $this->assertEquals($result, $api->getInstallationForRepo('MyOrg', 'MyRepo'));
+    }
+
     /**
      * @test
      */