我有一个图像加载器类,我需要在其中测试一些静态方法.由于Mockito不支持静态方法,因此我切换到Power Mockito.但是我正在测试的静态方法有一个方法调用
I have an image loader class and i need to test some static methods in it. Since Mockito does not support static methods i switched to Power Mockito. But the static method i am testing has a method call
Base64.encodeToString(byteArray, Base64.DEFAULT);要对此进行模拟,我将使用下面的 mockStatic 方法和@PrepareForTest批注.
To mock this i am using mockStatic method as below with @PrepareForTest annotation.
PowerMockito.mockStatic(Base64.class);但是Android Studio仍在返回我,但仍然返回以下错误.
But Android studio is returning me still returning me an error as below.
org.powermock.api.mockito.ClassNotPreparedException:该类 android.util.Base64未准备好进行测试.要准备这个课程,请添加 类到"@PrepareForTest"注释.
org.powermock.api.mockito.ClassNotPreparedException: The class android.util.Base64 not prepared for test. To prepare this class, add class to the '@PrepareForTest' annotation.
下面是我的完整代码.
要测试的代码:
import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Base64; import android.widget.ImageView; public static String convertBitmapToBase64(Bitmap imageBitmap, boolean withCompression) { ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); imageBitmappress(Bitmap.CompressFormat.PNG, 120, byteArrayOutputStream); byte[] byteArray = byteArrayOutputStream.toByteArray(); return Base64.encodeToString(byteArray, Base64.DEFAULT); }测试类代码
import android.graphics.Bitmap; import android.util.Base64; import org.junit.Before; import org.junit.runner.RunWith; import org.mockito.MockitoAnnotations; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; import org.testng.annotations.Test; @RunWith(PowerMockRunner.class) @PrepareForTest({Base64.class}) public class ImageLoaderTest { @Test public void testConvertBitmap(){ byte[] array = new byte[20]; PowerMockito.mockStatic(Base64.class); PowerMockito.when(Base64.encodeToString(array, Base64.DEFAULT)).thenReturn("asdfghjkl"); Bitmap mockedBitmap= PowerMockito.mock(Bitmap.class); String output = ImageLoaderUtils.convertBitmapToBase64(mockedBitmap); assert (!output.isEmpty()); }}
等级依赖性
testCompile 'junit:junit:4.12' testCompile 'org.powermock:powermock:1.6.5' testCompile 'org.powermock:powermock-module-junit4:1.6.5' testCompile 'org.powermock:powermock-api-mockito:1.6.5'推荐答案
您无法回答的简短内容.来自常见问题解答:
Short answer you can't. Here from the FAQ:
Mockito有哪些局限性
What are the limitations of Mockito
- 无法模拟最终课程
- 无法模拟静态方法
- 无法模拟最终方法-执行它们的实际行为没有任何异常. Mockito无法警告您有关模拟最终方法的信息,因此 保持警惕.
- Cannot mock final classes
- Cannot mock static methods
- Cannot mock final methods - their real behavior is executed without any exception. Mockito cannot warn you about mocking final methods so be vigilant.
有关此限制的更多信息:
Further information about this limitation:
我可以模拟静态方法吗?
Can I mock static methods?
不. Mockito更喜欢面向对象和依赖项注入 静态,难以理解的程序代码改变.如果你 处理可怕的旧代码,您可以使用JMockit或Powermock进行模拟 静态方法.
No. Mockito prefers object orientation and dependency injection over static, procedural code that is hard to understand & change. If you deal with scary legacy code you can use JMockit or Powermock to mock static methods.
如果要使用PowerMock,请尝试如下操作:
If you want to use PowerMock try like this:
@RunWith(PowerMockRunner.class) @PrepareForTest( { Base64.class }) public class YourTestCase { @Test public void testStatic() { mockStatic(Base64.class); when(Base64.encodeToString(argument)).thenReturn("expected result"); } }在 Mockito 2中,现在可以模拟最终的类了和最终方法.这是一个选择加入的选项.您需要使用以下内容创建文件src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker:
In Mockito 2 it's now possible to mock final Class and final Method. It's an opt-in option. You need to create the file src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker with the following content:
mock-maker-inline更多推荐
使用Power Mockito模拟方法调用
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