add functional tests

These are the tests that were formerly located at
https://github.com/lonvia/test-nominatim

tests/scenes/bin/make_scenes.sh

@@ -0,0 +1,31 @@
+#/bin/bash -e
+#
+# Regenerates wkts for scenarios.
+#
+
+datadir="$( cd "$( dirname "$0" )" && cd ../data && pwd )"
+
+if [! -d "$datadir" ]; then
+ echo "Cannot find data dir."; 
+ exit -1;
+fi
+
+echo "Using datadir $datadir"
+pushd $datadir
+
+# remove old wkts
+rm $datadir/*.wkt
+
+# create wkts from SQL scripts
+for fl in *.sql; do
+    echo "Processing $fl.."
+    cat $fl | psql -d nominatim -t -o ${fl/.sql/.wkt}
+done
+
+# create wkts from .osm files
+for fl in *.osm; do
+    echo "Processing $fl.."
+    ../bin/osm2wkt $fl
+done
+
+popd

tests/scenes/bin/osm2wkt.cc

@@ -0,0 +1,101 @@
+
+// The code in this file is released into the Public Domain.
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <unordered_map>
+
+#include <osmium/area/assembler.hpp>
+#include <osmium/area/collector.hpp>
+#include <osmium/area/problem_reporter_exception.hpp>
+#include <osmium/geom/wkt.hpp>
+#include <osmium/handler.hpp>
+#include <osmium/handler/node_locations_for_ways.hpp>
+#include <osmium/io/any_input.hpp>
+#include <osmium/visitor.hpp>
+#include <osmium/index/map/stl_map.hpp>
+
+typedef osmium::index::map::StlMap<osmium::unsigned_object_id_type, osmium::Location> index_type;
+
+typedef osmium::handler::NodeLocationsForWays<index_type, index_type> location_handler_type;
+
+
+class ExportToWKTHandler : public osmium::handler::Handler {
+
+    osmium::geom::WKTFactory m_factory;
+    std::unordered_map<std::string, std::ofstream>  m_files;
+
+public:
+
+    void node(const osmium::Node& node) {
+        print_geometry(node.tags(), m_factory.create_point(node));
+    }
+
+    void way(const osmium::Way& way) {
+        if (!way.is_closed() || !way.tags().get_value_by_key("area"))
+            print_geometry(way.tags(), m_factory.create_linestring(way));
+    }
+
+    void area(const osmium::Area& area) {
+        if (!area.from_way() || area.tags().get_value_by_key("area"))
+            print_geometry(area.tags(), m_factory.create_multipolygon(area));
+    }
+
+    void close() {
+        for (auto& fd : m_files)
+            fd.second.close();
+    }
+
+private:
+
+    void print_geometry(const osmium::TagList& tags, const std::string& wkt) {
+        const char* scenario = tags.get_value_by_key("test:section");
+        const char* id = tags.get_value_by_key("test:id");
+        if (scenario && id) {
+            auto& fd = m_files[std::string(scenario)];
+            if (!fd.is_open())
+                fd.open(std::string(scenario) + ".wkt");
+            fd << id << " |  " << wkt << "\n";
+        }
+    }
+
+}; // class ExportToWKTHandler
+
+int main(int argc, char* argv[]) {
+    if (argc != 2) {
+        std::cerr << "Usage: " << argv[0] << " OSMFILE\n";
+        exit(1);
+    }
+
+    std::string input_filename {argv[1]};
+
+    typedef osmium::area::Assembler area_assembler_type;
+    osmium::area::ProblemReporterException problem_reporter;
+    area_assembler_type assembler(&problem_reporter);
+    osmium::area::Collector<area_assembler_type> collector(assembler);
+
+    std::cerr << "Pass 1...\n";
+    osmium::io::Reader reader1(input_filename);
+    collector.read_relations(reader1);
+    std::cerr << "Pass 1 done\n";
+
+    index_type index_pos;
+    index_type index_neg;
+    location_handler_type location_handler(index_pos, index_neg);
+
+    std::cerr << "Pass 2...\n";
+    ExportToWKTHandler export_handler;
+    osmium::io::Reader reader2(input_filename);
+    osmium::apply(reader2, location_handler, export_handler, collector.handler());
+    reader2.close();
+    osmium::apply(collector, export_handler);
+    export_handler.close();
+    std::cerr << "Pass 2 done\n";
+
+
+    google::protobuf::ShutdownProtobufLibrary();
+
+}
+
+