public void Build_and_validate_schema()
{
/* Given */
var builder = new SchemaBuilder()
// query is required to build schema
.Query(out _);
/* When */
var(schema, validationResult) = builder.BuildAndValidate();
/* Then */
Assert.IsAssignableFrom <ISchema>(schema);
Assert.IsType <SchemaGraph>(schema);
Assert.NotNull(schema.Query);
Assert.IsType <NotImplementedException>(validationResult);
}
