Jacoco分支覆盖无法覆盖else if语句

Question

我在 quarkus 中编写了一个 Rest API，用于将英里转换为公里。

@GET
@Path("/miles-to-kilometers")
public Response milesToKilometers(@QueryParam("value") double miles) {
    double kilometers = miles * 1.60934;
    String answer = String.format("Kilometers: %.3f", kilometers);

    int roundedKms = (int) Math.floor(kilometers);

    if (roundedKms >= 0 && roundedKms <= 10) {
        answer = answer.concat(" is below 10");
    } else if (roundedKms >= 11 && roundedKms <= 20) {
        answer = answer.concat(" is below 20");
    } else if (roundedKms >= 21 && roundedKms <= 30) {
        answer = answer.concat(" is below 30");
    } else if (roundedKms >= 31 && roundedKms <= 40) {
        answer = answer.concat(" is below 40");
    } else if (roundedKms >= 41 && roundedKms <= 50) {
        answer = answer.concat(" is below 50");
    } else if (roundedKms >= 51) {
        answer = answer.concat(" more than 50");
    }

    return Response.ok(payload, MediaType.TEXT_PLAIN).build();
}

对于上面的代码片段，我使用junit编写了一个测试用例

@ParameterizedTest
@ValueSource(doubles = { 1, 0, 5.0, 15.0, 25.0, 35.0, 45.0, 55.0, 2.688, 5.645, 11.789, 15.678, 20.678, 28.211,
        35.212, 45.677 })
public void testMitoKm(double miles) {
    String url = String.format("/miles-to-kilometers=%.2f", miles);
    given()
        .when().get(url)
        .then()
        .statusCode(200)
        .body(containsString("Kilometers: "))
        .body(containsString(getExpectedMessageForMiles(miles)));
}

private String getExpectedMessageForMiles(double miles) {
    double kilometers = miles * 1.60934;
    int roundedKms = (int) Math.floor(kilometers);
    if (roundedKms >= 0 && roundedKms <= 10) {
        return " is below 10";
    } else if (roundedKms >= 11 && roundedKms <= 20) {
        return " is below 20";
    } else if (roundedKms >= 21 && roundedKms <= 30) {
        return " is below 30";
    } else if (roundedKms >= 31 && roundedKms <= 40) {
        return " is below 40";
    } else if (roundedKms >= 41 && roundedKms <= 50) {
        return " unbelievable";
    } else if (roundedKms >= 51) {
        return " is below 50";
    } else {
        return "";
    }
}

if 和 else if 分支仍然没有被 Jacoco 覆盖。 显示1/4分支未被覆盖。 在 else if 语句上给出黄色警告线。 如何覆盖 jacoco 中给定片段的所有分支？

Answer 1

在@ValueSource中我添加了一个负值-1。现在jacoco可以覆盖所有的分支了

@ParameterizedTest
@ValueSource(doubles = {-1, 1, 0, 2.688, 5.645, 11.789, 15.678, 20.678, 28.211,
        35.212, 45.677 })
public void testMitoKm(double miles) {...}

在valuesource中添加-1后，jacoco可以覆盖所有else if条件。