public void HasAnnotation_configures_only_annotations_that_have_not_already_been_set()
{
var type = new MockType();
var innerConfig = new EntityTypeConfiguration(type);
innerConfig.SetAnnotation("A1", "V1");
var config = new ConventionTypeConfiguration(type, () => innerConfig, new ModelConfiguration());
var result = config.HasTableAnnotation("A1", "V1B").HasTableAnnotation("A2", "V2");
Assert.Equal("V1", innerConfig.Annotations["A1"]);
Assert.Equal("V2", innerConfig.Annotations["A2"]);
Assert.Same(config, result);
}