[英]How to Mock java.util.Scanner for a FileInput
我在模拟来自在 CommandLineRunner 中运行的 STDIN 方式文件的输入时遇到问题。 我已经尝试了几种方法,但每当我运行测试时,应用程序都会要求我在命令行中插入文件。
我的命令行 class:
@Slf4j
public class CommandLineAppStartupRunner implements CommandLineRunner {
@Autowired
private AutorizadorService service;
@Override
public void run(String...args) throws Exception {
Scanner scan = new Scanner(System.in);
log.info("provide file path:");
service.init(scan.nextLine());
scan.close();
}
} ```
MyCommandLineTest class 1 try:
``` @SpringBootTest
public class CommandLineRunnerIntegrationTest {
@Autowired
private CommandLineRunner clr;
@Test
public void shouldRunCommandLineIntegrationTest1() throws Exception {
File file = new File("D:/j.json");
System.setIn(new FileInputStream(file));
this.clr.run();
}
@Test
public void shouldRunCommandLineIntegrationTest2() throws Exception {
Scanner mockScanner = mock(Scanner.class);
when(mockScanner.nextLine()).thenReturn("D:/j.json");
mockScanner.nextLine();
verify(mockScanner).nextLine();
}
@Test
public void shouldRunCommandLineIntegrationTest3() throws Exception {
InputStream in = new ByteArrayInputStream("D:/j.json".getBytes());
System.setIn(in);
}
}
运行任何这些测试我在命令行中看到这个,只有当我手动输入输入时才会通过
2021-08-21 15:56:36.327 INFO 14772 --- [ main] b.c.a.r.CommandLineAppStartupRunner : provide file path:
如果您在run
方法的开头设置断点,您将看到运行@SpringBootTest
实际上会运行该应用程序,即它会在它找到的任何运行器上调用run
方法。
您应该使用非 springboot 测试来测试 class:
@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = {CommandLineAppStartupRunner.class})
public class CommandLineRunnerIntegrationTest {
@Autowired
private CommandLineRunner clr;
@Test
public void shouldRunCommandLineIntegrationTest1() throws Exception {
System.setIn(getClass().getResourceAsStream("/test.json"));
this.clr.run();
}
}
您的 class 略有简化:
@Component
public class CommandLineAppStartupRunner implements CommandLineRunner {
@Override
public void run(String...args) throws Exception {
Scanner scan = new Scanner(System.in);
if (!scan.nextLine().equals("{ \"foo\": \"bar\"}")) {
throw new RuntimeException();
}
scan.close();
}
}
您需要在测试 class 上向@ContextConfiguration
添加所需的任何其他配置。
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