[9.19] Add issue reorder method (#564)

Co-authored-by: Graham Campbell <GrahamCampbell@users.noreply.github.com>

Author: marcoraddatz

lib/Gitlab/Api/Issues.php

@@ -88,6 +88,18 @@ public function update($project_id, $issue_iid, array $params)
         return $this->put($this->getProjectPath($project_id, 'issues/'.$this->encodePath($issue_iid)), $params);
     }
 
+    /**
+     * @param int|string $project_id
+     * @param int        $issue_iid
+     * @param array      $params
+     *
+     * @return mixed
+     */
+    public function reorder($project_id, $issue_iid, array $params)
+    {
+        return $this->put($this->getProjectPath($project_id, 'issues/'.$this->encodePath($issue_iid)).'/reorder', $params);
+    }
+
     /**
      * @param int|string $project_id
      * @param int        $issue_iid

test/Gitlab/Tests/Api/IssuesTest.php

@@ -177,6 +177,21 @@ public function shouldUpdateIssue()
         $this->assertEquals($expectedArray, $api->update(1, 2, ['title' => 'A renamed issue', 'labels' => 'foo']));
     }
 
+    /**
+     * @test
+     */
+    public function shouldReorderIssue()
+    {
+        $expectedArray = ['id' => 2, 'title' => 'A reordered issue'];
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('put')
+            ->with('projects/1/issues/2/reorder', ['move_after_id' => 3, 'move_before_id' => 4])
+            ->will($this->returnValue($expectedArray))
+        ;
+        $this->assertEquals($expectedArray, $api->reorder(1, 2, ['move_after_id' => 3, 'move_before_id' => 4]));
+    }
+
     /**
      * @test
      */