我尝试使用PowerMock Whitebox setInternalState api来覆盖最终类的静态最终变量。但它似乎并没有起作用。请参阅以下示例代码:
具有静态最终变量的最终类:
public final class BuildConfig {
public static final String BUILD_TYPE = "debug";
}
返回上述变量的辅助类:
public class BuildConfigHelperClass {
public String getBuildType() {
return BuildConfig.BUILD_TYPE;
}
}
测试类
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.core.classloader.annotations.SuppressStaticInitializationFor;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.reflect.Whitebox;
import static org.junit.Assert.*;
import static org.powermock.api.mockito.PowerMockito.mockStatic;
@RunWith(PowerMockRunner.class)
@SuppressStaticInitializationFor("BuildConfig")
@PrepareForTest({BuildConfigHelperClassTest.class, BuildConfigHelperClass.class, BuildConfig.class})
public class BuildConfigHelperClassTest {
private BuildConfigHelperClass subject;
@Before
public void setUp() {
subject = new BuildConfigHelperClass();
}
@Test
public void shouldReturnDebugBuildType() {
assertEquals("debug", subject.getBuildType());
}
@Test
public void shouldReturnProductionBuildType() {
mockStatic(BuildConfig.class);
Whitebox.setInternalState(BuildConfig.class, "BUILD_TYPE", "production");
assertEquals("production", subject.getBuildType());
}
}

在上面的测试类中,对于第二个测试subject.getBuildType()
方法应返回" production"因为我通过Whitebox重写它,但它总是因为返回值而失败,即" debug"。
任何人都可以指导我找不到的东西。
答案 0 :(得分:1)
编译器正在优化代码,其中包括:
public class BuildConfigHelperClass {
public String getBuildType() {
return BuildConfig.BUILD_TYPE;
}
}
基本上编译为:
public class BuildConfigHelperClass {
public String getBuildType() {
return "debug";
}
}
所以单元测试是针对没有引用BuildConfig的编译代码运行的。
不要直接引用BUILD_TYPE
,而是尝试添加静态getter:
public final class BuildConfig {
private static final String BUILD_TYPE = "debug";
public static final String getBuildType() {
return BUILD_TYPE;
}
}
然后可以模拟静态方法:
@Test
public void shouldReturnProductionBuildType() {
mockStatic(BuildConfig.class);
// Whitebox.setInternalState(BuildConfig.class, "BUILD_TYPE", "production");
PowerMockito.when(BuildConfig.getBuildType()).thenReturn("production");
assertEquals("production", subject.getBuildType());
}
这个测试适用于我的本地,虽然其他编译器可能仍然可以优化它并打破测试。