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我有一个应用程序处理ftp服务器，现在我想写一些测试，但我在开始时遇到了麻烦，我试图嘲笑会话工厂，但它抛出异常，无法理解为什么，这里是我的代码：Java模拟FTP会话
@Mock
SessionFactory<FTPFile> sessionFactory;
@Before
public void initMocks() {
MockitoAnnotations.initMocks(this);
DefaultFtpSessionFactory sf = new DefaultFtpSessionFactory();
sf.setHost(host);
sf.setPort(port);
sf.setUsername(username);
sf.setPassword(password);
Mockito.when(sessionFactory.getSession()).thenReturn((Session<FTPFile>) new CachingSessionFactory<FTPFile>(sf));
}
，这里是我得到的异常：
java.lang.IllegalArgumentException: [Assertion failed] - this String argument must have text; it must not be null, empty, or blank
at org.springframework.util.Assert.hasText(Assert.java:168)
at org.springframework.util.Assert.hasText(Assert.java:181)
at org.springframework.integration.ftp.session.AbstractFtpSessionFactory.setHost(AbstractFtpSessionFactory.java:101)
at com.melita.maltapay.schedule._ScheduledTasks.initMocks(_ScheduledTasks.java:48)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
谁能告诉我哪里做错了？ ：/