Add support for filtering on getCategories() (#1)

Support for filtering product categories to those the vendor
can upload designs for was added to the api.
The change here makes this usable by this client implementation.

src/DesignsClient.php

@@ -118,10 +118,18 @@ public function resubmitDesign($id, $resubmissionData)
         return json_decode($res->getBody()->getContents(), true);
     }
 
-    public function getCategories()
+    /**
+     * Returns a list of product categories
+     *
+     * Supports passing additional filter params, i.e., "'licensed' => 1"
+     * @see http://apidocs.affinitygateway.com/#operation/listCategories
+     * @param array $params key/value pairs of additional params
+     * @return array Product categories listing
+     */
+    public function getCategories(array $params = [])
     {
         $path = '/product_categories';
-        $res = $this->client->request('GET', $path);
+        $res = $this->client->request('GET', $path, ['query' => $params]);
 
         if ($res->getStatusCode() !== 200) {
             $this->throwInvalidResponseException($res);

tests/Affinity/ListCategoriesTest.php

@@ -35,6 +35,16 @@ public function request_has_appropriate_headers()
         $this->assertEquals('test-api-key', $requestHeaders['X-Api-Key'][0]);
     }
 
+    /** @test */
+    public function request_includes_parameters()
+    {
+        $this->designs->getCategories(['is_available' => true]);
+
+        $request = $this->historyContainer[0]['request'];
+
+        $this->assertEquals('is_available=1', $request->getUri()->getQuery());
+    }
+
     /** @test */
     public function throws_exception_on_non_200_response()
     {