jqwik -任意映射-在映射中生成随机数量的条目

Question

此代码用于为元素生成单个Map条目。但我希望使用generateInputMapElements从映射中生成随机数量的条目，并将其传递给statusReturnedFromApplyingRule()

@Property
        //@Report(Reporting.GENERATED)
    boolean statusReturnedFromApplyingRule(@ForAll("generateRule") Rule rule,
                                           @ForAll("generateInputMapElements") Iterable<Map<String, Object>> elements) {
        RangeMatchRule rangeMatchRule = new RangeMatchRule();
        final RuleIF.Status status = rangeMatchRule.applyRule(rule, elements);
        return RuleIF.getEnums().contains(status.toString());
    }

    @Provide
Arbitrary<Iterable<Map<String, Object>>> generateInputMapElements() {
    Arbitrary<Double> metricValueArb = Arbitraries.doubles()
            .between(0, 50.0);

    Arbitrary<Map<String, Object>> inputMapArb =
            metricValueArb.map(metricsValue -> {
                Map<String, Object> inputMap = new HashMap<>();
                inputMap.put(Utils.METRIC_VALUE, metricsValue);
                return inputMap;
            });
    return inputMapArb.map(inputMap -> {
        List<Map<String, Object>> inputMapLst = new ArrayList<>();
        inputMapLst.add(inputMap);
        return inputMapLst;
    });
}

How to write a jqwik generator method with nested generators

Answer 1

假设您想要一个包含单个条目的map列表(可迭代)，我看到了两个基本选项。

选项1-使用Arbitrary.list()生成列表，并直接在生成器代码中指定最小和最大大小：

@Provide
Arbitrary<List<Map<String, Object>>> generateInputMapElements() {
    Arbitrary<Double> metricValueArb = Arbitraries.doubles()
                                                  .between(0, 50.0);

    return metricValueArb
        .map(metricsValue -> {
            Map<String, Object> inputMap = new HashMap<>();
            inputMap.put(Utils.METRIC_VALUE, metricsValue);
            return inputMap;
        })
        .list().ofMinSize(1).ofMaxSize(10);
}

选项2-只生成单个映射，并对可迭代对象使用标准注释：

@Property
@Report(Reporting.GENERATED)
boolean statusReturnedFromApplyingRule2(
    @ForAll("generateRule") Rule rule,
    @ForAll @Size(min = 1, max = 10) Iterable<@From("generateInputMap") Map<String, Object>> elements
) {
    ...
}

@Provide
Arbitrary<Map<String, Object>> generateInputMap() {
    Arbitrary<Double> metricValueArb = Arbitraries.doubles()
                                                  .between(0, 50.0);

    return metricValueArb
        .map(metricsValue -> {
            Map<String, Object> inputMap = new HashMap<>();
            inputMap.put(Utils.METRIC_VALUE, metricsValue);
            return inputMap;
        });
}

我个人会选择选项2，因为它需要的代码更少。不过是YMMV。