java单元测试之Mock静态方法

1

public final class AmountUtil {
    public static String CustomFormatWith2Digits(int amount) {
        return "1";
    }
}

2.引入依赖

<dependency>
      <groupId>org.mockito</groupId>
      <artifactId>mockito-core</artifactId>
      <version>1.10.19</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-api-mockito</artifactId>
      <version>1.6.5</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-module-junit4</artifactId>
      <version>1.6.5</version>
      <scope>test</scope>
    </dependency>

3.写单元测试

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.mockito.Matchers.anyInt;
import static org.mockito.Matchers.eq;
import static org.mockito.MockitoAnnotations.initMocks;
import static org.mockito.Matchers.anyObject;
import static org.mockito.Mockito.when;

@RunWith(PowerMockRunner.class)
@PrepareForTest({AmountUtil.class})
@PowerMockIgnore("javax.management.*")
public class StaticClassTest {

    @Before
    public void setUp() throws Exception {
        initMocks(this);
    }

    @Test
    public void test1() throws Exception {
        this.mockResources();
        String s = AmountUtil.CustomFormatWith2Digits(1);
        Assert.assertTrue(s == "");
    }

    private void mockResources() throws Exception {
        PowerMockito.mockStatic(AmountUtil.class);

        PowerMockito.when(AmountUtil.CustomFormatWith2Digits(anyInt())).thenReturn("");
    }
}