问题

最佳方法编写ArchUnit测试，测试带有特定注解（例如Spring Framework的@Component注解）的类仅具有一个公共方法是什么？

我还没有尝试过任何方法，因为我仍在学习ArchUnit。

答案1

得分: 1

Here is the translation of the code portion you provided:

每当预定义的流畅 API (`classes().that().….should().…`) 无法提供解决方案时，您可以定义自定义的 `DescribedPredicate`s 和 `ArchConditions`s，并使用 `classes().that(…).should(…)`。

对于您的问题，我会使用以下内容：

```java
import com.tngtech.archunit.junit.ArchTest;
import com.tngtech.archunit.lang.ArchRule;

import static com.tngtech.archunit.base.DescribedPredicate.describe;
import static com.tngtech.archunit.core.domain.JavaModifier.PUBLIC;
import static com.tngtech.archunit.core.domain.properties.HasModifiers.Predicates.modifier;
import static com.tngtech.archunit.lang.conditions.ArchConditions.have;
import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.classes;

public class StackOverflow76272127 {

  @ArchTest
  ArchRule components_should_have_only_one_public_method =
      classes()
          .that().areAnnotatedWith(Component.class)
          .should(have(describe("only one public method", javaClass ->
              javaClass.getMethods().stream().filter(modifier(PUBLIC)).count() == 1
          )));
}  

Please note that I've translated the code while preserving its formatting and structure.

<details>
<summary>英文:</summary>

Whenever the predefined fluent API (`classes().that().….should().…`) does not offer a solution, you can define custom `DescribedPredicate`s and `ArchConditions`s and use `classes().that(…).should(…)`.

For your issue, I would use this:

```java
import com.tngtech.archunit.junit.ArchTest;
import com.tngtech.archunit.lang.ArchRule;

import static com.tngtech.archunit.base.DescribedPredicate.describe;
import static com.tngtech.archunit.core.domain.JavaModifier.PUBLIC;
import static com.tngtech.archunit.core.domain.properties.HasModifiers.Predicates.modifier;
import static com.tngtech.archunit.lang.conditions.ArchConditions.have;
import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.classes;

public class StackOverflow76272127 {

  @ArchTest
  ArchRule components_should_have_only_one_public_method =
      classes()
          .that().areAnnotatedWith(Component.class)
          .should(have(describe(&quot;only one public method&quot;, javaClass -&gt;
              javaClass.getMethods().stream().filter(modifier(PUBLIC)).count() == 1
          )));
}