[core] #6071 - extract GeoJSONOptions conversion from GeoJSONSource conversion

* [core] geojson_options - retain original error message

* [core] tests - initial style conversion stub methods

* [core] geojsonoptions conversion - initial unit tests

* [core] tests - fix forward reference issue

* [core] geojsonoptions conversion - unit tests

* [core] geojsonoptions conversion - renamed Holder to Value

1 files changed, 68 insertions, 0 deletions

diff --git a/test/style/conversion/geojson_options.cpp b/test/style/conversion/geojson_options.cpp
new file mode 100644
index 0000000000..46a2aa950b
--- /dev/null
+++ b/test/style/conversion/geojson_options.cpp
@@ -0,0 +1,68 @@
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/style/conversion.hpp>
+#include <mbgl/style/conversion/geojson_options.hpp>
+#include <mbgl/test/conversion_stubs.hpp>
+
+#include <mbgl/platform/log.hpp>
+
+using namespace mbgl::style;
+using namespace mbgl::style::conversion;
+
+TEST(GeoJSONOptions, Basic) {
+    ValueMap map;
+    Value raw(map);
+    Result<GeoJSONOptions> converted = convert<GeoJSONOptions>(raw);
+    ASSERT_TRUE((bool) converted);
+}
+
+TEST(GeoJSONOptions, ErrorHandling) {
+    ValueMap map {{"maxzoom", "should not be a string"}};
+    Value raw(map);
+    Result<GeoJSONOptions> converted = convert<GeoJSONOptions>(raw);
+    ASSERT_FALSE((bool) converted);
+}
+
+TEST(GeoJSONOptions, RetainsDefaults) {
+    ValueMap map;
+    Value raw(map);
+    GeoJSONOptions converted = *convert<GeoJSONOptions>(raw);
+    GeoJSONOptions defaults;
+    
+    //GeoJSON-VT
+    ASSERT_EQ(converted.maxzoom, defaults.maxzoom);
+    ASSERT_EQ(converted.buffer, defaults.buffer);
+    ASSERT_EQ(converted.tolerance, defaults.tolerance);
+    
+    //Supercluster
+    ASSERT_EQ(converted.cluster, defaults.cluster);
+    ASSERT_EQ(converted.clusterRadius, defaults.clusterRadius);
+    ASSERT_EQ(converted.clusterMaxZoom, defaults.clusterMaxZoom);
+}
+
+
+TEST(GeoJSONOptions, FullConversion) {
+    ValueMap map {
+        //GeoJSON-VT
+        {"maxzoom", 1},
+        {"buffer", 2},
+        {"tolerance", 3},
+        
+        //Supercluster
+        {"cluster", true},
+        {"clusterRadius", 4},
+        {"clusterMaxZoom", 5}
+    };
+    Value raw(map);
+    GeoJSONOptions converted = *convert<GeoJSONOptions>(raw);
+    
+    //GeoJSON-VT
+    ASSERT_EQ(converted.maxzoom, 1);
+    ASSERT_EQ(converted.buffer, 2);
+    ASSERT_EQ(converted.tolerance, 3);
+    
+    //Supercluster
+    ASSERT_EQ(converted.cluster, true);
+    ASSERT_EQ(converted.clusterRadius, 4);
+    ASSERT_EQ(converted.clusterMaxZoom, 5);
+}