Test for encoding lists in Spock

IterableCodecSpecification.groovy

class IterableCodecSpecification extends Specification {
    private BSONWriter bsonWriter = Mock();

    @Subject
    private final IterableCodec iterableCodec = new IterableCodec(Codecs.createDefault());

    public void 'should encode list of strings'() {
        setup:
        List<String> stringList = ['Uno', 'Dos', 'Tres'];

        when:
        iterableCodec.encode(bsonWriter, stringList);

        then:
        1 * bsonWriter.writeStartArray();
        1 * bsonWriter.writeString('Uno');
        1 * bsonWriter.writeString('Dos');
        1 * bsonWriter.writeString('Tres');
        1 * bsonWriter.writeEndArray();
    }
}