技巧

Mock 静态方法

GroovyMock 也可以 mock 静态方法，但其只能 mock 由 Groovy 编写的静态方法，不能对 Java 编写的静态方法进行 mock，需要使用其他方法进行 mock。

spock-1.x 版本中 mock 静态方法使用 powermock，而在 2.x 中需要使用 Mockito-3.4^[1]。

mockito 需要依赖以下 jar：

org.mockito:mockito-core:4.3.1
org.mockito:mockito-inline:4.3.1

使用方法：

class StudentTest extends Specification {

    Mockito.mockStatic(IDGenerator.class)

    def "should success when create student"() {
        given:
            var name = "tester"
            var code = "123456"
            Mockito.when(IDGenerator.nextId()).thenReturn("123456789")
        when:
            var student = Student.create(name, code)
        then:
           student.getId() == "123456789"
    }
}

class StudentTest extends Specification {

    MockedStatic<IDGenerator> generator

    def setup() {
        generator = Mockit.mockStatic(IDGenerator.class)
    }

    // The test case 
    def cleanup() {
        // eliminate Mock Static method of 
        generator.close()
    }
}

Maven 工程

pom.xml 依赖以下内容：

<properties>
  <spock.version>2.1-groovy-3.0</spock.version>
  <byte-buddy.version>1.12.9</byte-buddy.version>
  <mockito.version>4.3.1</mockito.version>
  <logback.version>1.2.11</logback.version>
</properties>

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.spockframework</groupId>
      <artifactId>spock-bom</artifactId>
      <version>${spock.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <!-- test -->
  <dependency>
    <groupId>org.spockframework</groupId>
    <artifactId>spock-core</artifactId>
    <scope>test</scope>
  </dependency>

  <dependency>
    <groupId>net.bytebuddy</groupId>
    <artifactId>byte-buddy</artifactId>
    <version>${byte-buddy.version}</version>
    <scope>test</scope>
  </dependency>

  <dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>${mockito.version}</version>
    <scope>test</scope>
  </dependency>

  <dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-inline</artifactId>
    <version>${mockito.version}</version>
    <scope>test</scope>
  </dependency>

  <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>${logback.version}</version>
    <scope>test</scope>
  </dependency>
</dependencies>

<!-- 这个不加的话无法执行单元测试类 -->
<plugin>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>3.0.0-M5</version>
</plugin>

<plugin>
  <groupId>org.codehaus.gmavenplus</groupId>
  <artifactId>gmavenplus-plugin</artifactId>
  <version>1.13.1</version>
  <executions>
    <execution>
      <goals>
        <goal>compile</goal>
        <goal>compileTests</goal>
      </goals>
    </execution>
  </executions>
  <configuration>
    <testSources>
      <testSource>
        <directory>${project.basedir}/src/test/groovy</directory>
        <includes>
          <include>**/*.groovy</include>
        </includes>
      </testSource>
    </testSources>
  </configuration>
</plugin>

1. https://copyfuture.com/blogs-details/202205082152513359 ↩