我尝试使用Spy测试,但失败了。以下类是Sut。
public class FileManager {
public int removeFiles(String directory) {
int count = 0;
if(isDirectory(directory)) {
String[] files = findFiles(directory);
for(String file : files) {
deleteFile(file);
count++;
}
}
return count;
}
private boolean isDirectory(String directory) {
return directory.endsWith("/");
}
private String[] findFiles(String directory) {
// read files from disk.
return null;
}
private void deleteFile(String file) {
// delete a file.
return;
}
}
然后,我创建了以下类似的测试。
class SpyTest extends Specification {
def "Should return the number of files deleted"() {
given:
def fileManager = Spy(FileManager)
1 * fileManager.findFiles("directory/") >> { return ["file1", "file2", "file3", "file4"] }
fileManager.deleteFile(_) >> { println "deleted file."}
when:
def count = fileManager.removeFiles("directory/")
then:
count == 4
}
但是我遇到了空指针异常。
java.lang.NullPointerException
at example.spock.mock.FileManager.removeFiles(FileManager.java:8)
at net.sf.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.spockframework.mock.runtime.CglibRealMethodInvoker.respond(CglibRealMethodInvoker.java:32)
at org.spockframework.mock.runtime.MockInvocation.callRealMethod(MockInvocation.java:60)
at org.spockframework.mock.CallRealMethodResponse.respond(CallRealMethodResponse.java:29)
at org.spockframework.mock.runtime.MockController.handle(MockController.java:49)
at org.spockframework.mock.runtime.JavaMockInterceptor.intercept(JavaMockInterceptor.java:72)
at org.spockframework.mock.runtime.CglibMockInterceptorAdapter.intercept(CglibMockInterceptorAdapter.java:30)
at example.spock.mock.SpyTest.Should return the number of files deleted(SpyTest.groovy:13)
这意味着实际的方法已被调用。它为什么不能正常工作?