public async Task FetchEntityTest1()
        {
            var site   = await WikidataSiteAsync;
            var entity = new Entity(site, WikidataItems.Chumulangma);
            await entity.RefreshAsync(EntityQueryOptions.FetchAllProperties);

            ShallowTrace(entity);
            ShallowTrace(entity.Claims, 4);
            Assert.Equal(WikidataItems.Chumulangma, entity.Title);
            Assert.Equal(WikidataItems.Chumulangma, entity.Id);
            Assert.Equal(EntityType.Item, entity.Type);
            Assert.Equal("Mount Everest", entity.Labels["en"]);
            Assert.Contains("Qomolangma", entity.Aliases["en"]);
            Assert.Equal("珠穆朗玛峰", entity.Labels["zh-Hans"]);
            Assert.Equal("珠穆朗瑪峰", entity.Labels["lzh"]);
            Assert.Equal("エベレスト", entity.Labels["ja"]);

            var claim = entity.Claims[WikidataProperties.CommonsCategory].First();

            Assert.Equal(BuiltInDataTypes.String, claim.MainSnak.DataType);
            Assert.Equal(SnakType.Value, claim.MainSnak.SnakType);
            Assert.Equal("Mount Everest", claim.MainSnak.DataValue);

            // Now it belongs to "Seven Summits"
            //var parts = entity.Claims[WikidataProperties.PartOf].Select(c => c.MainSnak.DataValue).ToArray();
            //Assert.Contains(WikidataItems.Earth, parts);
            //Assert.Contains(WikidataItems.Asia, parts);

            claim = entity.Claims[WikidataProperties.CoordinateLocation].First();
            var location = (WbGlobeCoordinate)claim.MainSnak.DataValue;

            Assert.Equal(27.988055555556, location.Latitude, 12);
            Assert.Equal(86.925277777778, location.Longitude, 12);

            claim = entity.Claims[WikidataProperties.ElevationAboveSeaLevel].First();
            var height = (WbQuantity)claim.MainSnak.DataValue;

            Assert.Equal(8848, height.Amount, 4);
            Assert.Equal(WikidataProperties.ReferenceUrl, claim.References[0].Snaks[0].PropertyId);
            Assert.Equal("https://www.peakware.com/peaks.php?pk=80", claim.References[0].Snaks[0].DataValue);

            var topiso = (WbQuantity)entity.Claims[WikidataProperties.TopographicIsolation]
                         .First().MainSnak.DataValue;

            Assert.Equal(40008, topiso.Amount, 12);
            Assert.Equal(WikibaseUriFactory.Get(WikidataEntityUriPrefix + WikidataItems.KiloMeter), topiso.Unit);
        }
        private Uri MapEntityUri(Uri uri, bool optional)
        {
            if (EntityMapping == null)
            {
                return(uri);
            }
            // For quantities without units
            if (uri == WbQuantity.Unity)
            {
                return(uri);
            }
            var sourceId = sourceSiteWikibaseInfo.ParseEntityId(uri.ToString());
            var mapped   = (string)EntityMapping[sourceId];

            if (mapped != null)
            {
                return(WikibaseUriFactory.Get(destinationSiteWikibaseInfo.MakeEntityUri(mapped)));
            }
            if (!optional)
            {
                throw new KeyNotFoundException($"Cannot find mapped entity for {uri}.");
            }
            return(null);
        }