OpenRewrite迁移JUnit静态导入的assertThrows至AssertJ失败问题排查

可能的原因与解决方案 #

1. 升级Rewrite测试框架配方版本 #

你当前使用的rewrite-testing-frameworks:2.6.0版本对assertThrows这类静态导入断言的迁移支持存在不足。建议升级到较新的稳定版本（如2.10.0及以上），新版本通常会修复这类覆盖不全的问题。

修改Gradle依赖：

implementation("org.openrewrite.recipe:rewrite-testing-frameworks:2.10.0")

2. 显式启用完整的AssertJ迁移配方集 #

确保Rewrite配置中，除了JUnitToAssertj，还显式添加异常断言相关的子配方，同时启用JUnitStaticImportsToAssertj覆盖静态导入的转换：

rewrite {
    activeRecipe("org.openrewrite.java.testing.assertj.JUnitToAssertj")
    activeRecipe("org.openrewrite.java.testing.assertj.JUnitAssertThrowsToAssertExceptionType")
    activeRecipe("org.openrewrite.java.testing.assertj.JUnitStaticImportsToAssertj")
}

3. 手动迁移未转换的代码（临时方案） #

如果自动迁移仍不生效，可手动将JUnit的异常断言转换为AssertJ的写法：

示例1迁移后代码

import static org.assertj.core.api.Assertions.assertThatThrownBy;

@Test
@DisplayName("resolve contract state - no interest matches ref")
void testResolveContractStateNoInterest() throws ApplicationException {
    // given
    Contract contractMock = createContractMock(false, false);
    mockContractApi(contractMock);

    InsuranceSuspensionView suspensionMock = createSuspensionMock(false);
    mockAmendmentApi(suspensionMock);

    // when
    ContractRequiredServiceImpl classUnderTest = spy(new ContractRequiredServiceImpl(sc));

    // then
    ContractException exception = assertThatThrownBy(() -> 
            classUnderTest.resolveContractState(GIVEN_CONTRACT_REF, UNKNOWN_INTEREST_REF, GIVEN_BUSINESS_DATE))
        .isInstanceOf(ContractException.class)
        .extracting(ex -> ex.getError().getMessageId())
        .isEqualTo("My Custom Error Message");
}

示例2迁移后代码

import static org.assertj.core.api.Assertions.assertThatThrownBy;

@Test
void mapKorrekturgrundReasonThrows() {
    // when + then
    assertThatThrownBy(() -> IccTypeMapper.INSTANCE.mapKorrekturgrundReason(null))
        .isInstanceOf(IllegalArgumentException.class);
}

对于assertDoesNotThrow，对应的AssertJ写法是：

import static org.assertj.core.api.Assertions.assertThatCode;

assertThatCode(() -> yourMethodCall()).doesNotThrowAnyException();

4. 检查版本兼容性 #

确保AssertJ Gradle插件（6.11.2）与Rewrite测试框架配方版本匹配，避免因版本不兼容导致功能失效。

内容的提问来源于stack exchange，提问作者cyberpunk