From fa549b380a473c378c422235e615553be12c5085 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Thu, 23 Mar 2017 14:58:39 +0000
Subject: [PATCH] GeoJSON IO test - ensure geometries round-trip.

---
 test/unit/datasource/geojson.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/test/unit/datasource/geojson.cpp b/test/unit/datasource/geojson.cpp
index 3ce44506c..88e89c24e 100644
--- a/test/unit/datasource/geojson.cpp
+++ b/test/unit/datasource/geojson.cpp
@@ -29,9 +29,10 @@
 #include <mapnik/geometry.hpp>
 #include <mapnik/geometry_type.hpp>
 #include <mapnik/json/geometry_parser.hpp> // from_geojson
+#include <mapnik/util/geometry_to_geojson.hpp>
 #include <mapnik/util/fs.hpp>
 #include <cstdlib>
-
+#include <algorithm>
 #include <boost/optional/optional_io.hpp>
 
 /*
@@ -128,10 +129,19 @@ TEST_CASE("geojson") {
                     "{ \"type\": \"MultiPolygon\", \"coordinates\": [[ []] ] }"
                 };
 
-            for (auto const& json  : valid_empty_geometries)
+            for (auto const& in  : valid_empty_geometries)
             {
+                std::string json(in);
                 mapnik::geometry::geometry<double> geom;
                 CHECK(mapnik::json::from_geojson(json, geom));
+                // round trip
+                std::string json_out;
+                CHECK(mapnik::util::to_geojson(json_out, geom));
+                json.erase(std::remove_if(
+                               std::begin(json), std::end(json),
+                               [l = std::locale{}](auto ch) { return std::isspace(ch, l); }
+                               ), std::end(json));
+                REQUIRE(json == json_out);
             }
 
             auto invalid_empty_geometries =