public void ShouldConvertToRel()
{
object obj = new Relationship(1, -2, -3, "Type",
new Dictionary <string, object> {
{ "key1", "value1" }, { "key2", 2 }
});
var actual = obj.As <IRelationship>();
actual.Id.Should().Be(1);
actual.Type.Should().Be("Type");
actual.Properties["key1"].As <string>().Should().Be("value1");
actual.Properties["key2"].As <string>().Should().Be("2");
obj.As <string>().Should().Be($"{obj.GetType()}");
}