High-level test db that creates materialised documents

[cafca]

For testing the GraphQL API I would like to have a high-level alternative to test_db that can create application schemas and documents in the test db that use these schemas. It should also materialise these documents.

It could have an api similar to this:

fn new_test(
        #[from(test_db_with_documents)]
        #[with(
            // Creates application schemas
            vec![
                // Publishes and materialises a schema `schema_name` with the given field definitions
                ("schema_name", vec![("field_name", FieldType::Boolean)]),
                // More schemas could be created here...
            ]
            // Creates documents for the created schemas
            vec![
                // First document uses the just created `schema_name` schema
                ("schema_name", vec![
                    create_operation(vec![("field_name", OperationValue::Boolean(true))])
                ]),
                // Second document uses a system schema and includes an update operation
                (&SchemaId::SomeSystemSchema(1).as_str(), vec![
                    create_operation(vec![...]),
                    update_operation(vec![...])
                ])
            ]
        )]
        runner: TestDatabaseRunner,
    )

[sandreae]

Nice! We will need something like this soon everywhere when we validate incoming operations against stored schema.

Node in p2panda-rs performs materialisation, so maybe this can be used in some way.