Java Mocking SecureRandom::nextInt()
我有一个类,它使用SecureRandom实例并获取下一个随机数 比如说:Java Mocking SecureRandom::nextInt(),java,unit-testing,junit,mockito,powermock,Java,Unit Testing,Junit,Mockito,Powermock,我有一个类,它使用SecureRandom实例并获取下一个随机数 比如说: public class ExampleClass() { public void method() { Random sr = new SecureRandom(); System.out.printf("%d %n", sr.nextInt(1)); System.out.printf("%d %n", sr.nextInt(1)); } } 测试代码 @RunW
public class ExampleClass() {
public void method() {
Random sr = new SecureRandom();
System.out.printf("%d %n", sr.nextInt(1));
System.out.printf("%d %n", sr.nextInt(1));
}
}
测试代码
@RunWith(PowerMockRunner.class)
public class ExampleClassTest {
...
@Test
@PrepareOnlyThisForTest(SecureRandom.class)
public void mockedTest() throws Exception {
Random spy = PowerMockito.spy(new SecureRandom());
when(spy, method(SecureRandom.class, "nextInt", int.class))
.withArguments(anyInt())
.thenReturn(3, 0);
instance.method();
}
当我试图运行单元测试时,单元测试最终被冻结。当我尝试只调试该方法时,JUnit会报告该测试不是该类的成员
No tests found matching Method mockedTest(ExampleClass) from org.junit.internal.requests.ClassRequest@6a6cb05c
编辑:将@PrepareOnlyThisForTest移动到perparefortest到类的顶部修复了冻结问题。然而,我得到的问题是,该方法没有被嘲笑 尝试在测试的类级别而不是方法级别使用@PrepareForTest
@RunWith(PowerMockRunner.class)
@PrepareForTest(SecureRandom.class)
public class ExampleClassTest {
...
}
编辑:为了调用模拟,您需要执行以下操作:
1) 将ExampleClass添加到PrepareForTest注释:
@RunWith(PowerMockRunner.class)
@PrepareForTest({SecureRandom.class, ExampleClass.class})
public class ExampleClassTest {
...
}
2) 模拟SecureRandom的构造函数调用:
SecureRandom mockRandom = Mockito.mock(SecureRandom.class);
PowerMockito.whenNew(SecureRandom.class).withNoArguments().thenReturn(mockRandom);
下面给出了一个工作示例:
@RunWith(PowerMockRunner.class)
@PrepareForTest({SecureRandom.class, ExampleClass.class})
public class ExampleClassTest {
private ExampleClass example = new ExampleClass();
@Test
public void aTest() throws Exception {
SecureRandom mockRandom = Mockito.mock(SecureRandom.class);
PowerMockito.whenNew(SecureRandom.class).withNoArguments().thenReturn(mockRandom);
Mockito.when(mockRandom.nextInt(Mockito.anyInt())).thenReturn(3, 0);
example.method();
}
}
这很管用,但现在我遇到了一个问题,SecureRandom调用本机实现而不是模拟。这很管用!谢谢在Python上的mocker和java中的Mockito/Powermock之间,我有很多东西需要习惯。