Add trace to Project API

Get a trace of a specific build of a project

Author: benmag

lib/Gitlab/Api/Projects.php

@@ -149,6 +149,16 @@ public function build($project_id, $build_id)
         return $this->get($this->getProjectPath($project_id, 'builds/'.$this->encodePath($build_id)));
     }
 
+    /**
+     * @param $project_id
+     * @param $build_id
+     * @return mixed
+     */
+    public function trace($project_id, $build_id)
+    {
+        return $this->get($this->getProjectPath($project_id, 'builds/'.$this->encodePath($build_id).'/trace'));
+    }
+
     /**
      * @param int $project_id
      * @param string $username_query

test/Gitlab/Tests/Api/ProjectsTest.php

@@ -254,6 +254,23 @@ public function shouldGetBuild()
 
         $this->assertEquals($expectedArray, $api->build(1, 2));
     }
+    
+    /**
+     * @test
+     */
+    public function shouldGetTrace()
+    {
+        $expectedString = 'runner trace of a specific build';
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with('projects/1/builds/2/trace')
+            ->will($this->returnValue($expectedString))
+        ;
+
+        $this->assertEquals($expectedString, $api->trace(1, 2));
+    }
 
     /**
      * @test