From a1782481393ad7fe5fa976bda348127248c6bd3b Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Fri, 21 Jul 2017 10:12:43 -0700
Subject: [node] Reset Style::Impl::lastError when loading a new style

---
 platform/node/test/js/request.test.js | 51 +++++++++++++++++++++++++++++++++++
 src/mbgl/style/style_impl.cpp         |  2 ++
 2 files changed, 53 insertions(+)

diff --git a/platform/node/test/js/request.test.js b/platform/node/test/js/request.test.js
index ec2b084f4e..4f8d1cabb0 100644
--- a/platform/node/test/js/request.test.js
+++ b/platform/node/test/js/request.test.js
@@ -114,3 +114,54 @@ test(`render ignores request functions calling the callback a second time`, func
     });
 });
 
+test(`render reports an error from loading the current style`, function(t) {
+    var map = new mbgl.Map({
+        request: function(req, callback) {
+            var data = mockfs.dataForRequest(req);
+            if (mockfs.source_vector === data) {
+                callback(new Error('message'));
+            } else {
+                callback(null, { data: data });
+            }
+        }
+    });
+    map.load(mockfs.style_vector);
+    map.render({ zoom: 16 }, function(err, pixels) {
+        t.assert(err);
+        t.assert(/message/.test(err.message));
+        t.assert(!pixels);
+
+        map.render({ zoom: 16 }, function(err, pixels) {
+            t.assert(err);
+            t.assert(/message/.test(err.message));
+            t.assert(!pixels);
+            t.end();
+        });
+    });
+});
+
+test(`render does not report an error from rendering a previous style`, function(t) {
+    var map = new mbgl.Map({
+        request: function(req, callback) {
+            var data = mockfs.dataForRequest(req);
+            if (mockfs.source_vector === data) {
+                callback(new Error('message'));
+            } else {
+                callback(null, { data: data });
+            }
+        }
+    });
+    map.load(mockfs.style_vector);
+    map.render({ zoom: 16 }, function(err, pixels) {
+        t.assert(err);
+        t.assert(/message/.test(err.message));
+        t.assert(!pixels);
+
+        map.load(mockfs.style_raster);
+        map.render({ zoom: 16 }, function(err, pixels) {
+            t.error(err);
+            t.assert(pixels);
+            t.end();
+        });
+    });
+});
diff --git a/src/mbgl/style/style_impl.cpp b/src/mbgl/style/style_impl.cpp
index 9cc2588ca7..604af4be20 100644
--- a/src/mbgl/style/style_impl.cpp
+++ b/src/mbgl/style/style_impl.cpp
@@ -38,6 +38,7 @@ Style::Impl::Impl(Scheduler& scheduler_, FileSource& fileSource_, float pixelRat
 Style::Impl::~Impl() = default;
 
 void Style::Impl::loadJSON(const std::string& json_) {
+    lastError = nullptr;
     observer->onStyleLoading();
 
     url.clear();
@@ -45,6 +46,7 @@ void Style::Impl::loadJSON(const std::string& json_) {
 }
 
 void Style::Impl::loadURL(const std::string& url_) {
+    lastError = nullptr;
     observer->onStyleLoading();
 
     loaded = false;
-- 
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