AggregationOptionsTests - Refactored

@BeforeEach
public void setup() {
    aggregationOptions = newAggregationOptions().explain(true)
        .cursorBatchSize(1)
        .allowDiskUse(true)
        .comment("hola!")
        .build();
}

@Test
public void aggregationOptionsBuilderShouldSetAllowDiskUseAccordingly() {
    assertThat(aggregationOptions.isAllowDiskUse()).isTrue();
}

public void aggregationOptionsBuilderShouldSetisExplainAccordingly() {
    assertThat(aggregationOptions.isExplain()).isTrue();
}

public void aggregationOptionsBuilderShouldGetCursorAccordingly() {
    assertThat(aggregationOptions.getCursor().get()).isEqualTo(new Document("batchSize", 1));
}