@Test
public void testWriteFeatureAsSimplePolygon() throws
                                              Exception {

    // given a Feature as simple Polygon
    final Feature feature = mock(Feature.class);
    doReturn("id1").when(feature)
                   .getId();
    doReturn("Feature").when(feature)
                       .getType();
    doReturn(createPolygon(gf,
                           createCoordinate(gf,
                                            47.226219d,
                                            -1.554430d),
                           createCoordinate(gf,
                                            47.226237d,
                                            -1.554261d),
                           createCoordinate(gf,
                                            47.226122d,
                                            -1.554245d),
                           createCoordinate(gf,
                                            47.226106d,
                                            -1.554411d),
                           createCoordinate(gf,
                                            47.226219d,
                                            -1.554430d))).when(feature)
                                                         .getGeometry();
    doReturn(new Bundle()).when(feature)
                          .getProperties();
    // when write this Feature as JSON string
    final StringWriter writer = new StringWriter();
    geoJsonWriter.write(writer,
                        feature);
    // then
    assertNotNull(writer.toString());
    assertEquals(TestHelper.getFixture("feature_polygon_simple.json"),
                 writer.toString());
}