1 files changed, 5 insertions, 1 deletions
diff --git a/test/api/custom_layer.cpp b/test/api/custom_layer.cpp
index 923bf4566e..ef98b05983 100644
--- a/test/api/custom_layer.cpp
+++ b/test/api/custom_layer.cpp
@@ -13,6 +13,10 @@ using namespace mbgl;
 static const GLchar * vertexShaderSource = "attribute vec2 a_pos; void main() { gl_Position = vec4(a_pos, 0, 1); }";
 static const GLchar * fragmentShaderSource = "void main() { gl_FragColor = vec4(0, 1, 0, 1); }";
 
+// Not using any mbgl-specific stuff (other than a basic error-checking macro) in the
+// layer implementation because it is intended to reflect how someone using custom layers
+// might actually write their own implementation.
+
 class TestLayer {
 public:
     ~TestLayer() {
@@ -66,7 +70,7 @@ public:
 TEST(CustomLayer, Basic) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    OnlineFileSource fileSource(nullptr);
+    OnlineFileSource fileSource;
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");