资 源 简 介
Occasionally applications written in a TDD environment need to interact with java.lang.System. Sometimes writing tests for this behavior gets rather involved, and is sometimes skipped. It is my hope with this library to add a few Rules (requiring Junit 4.7 or higher) to make testing these types of calls easier.
For now, the following calls can be tested:
* System.out
* System.err
* System.exit
Here is a quick example of how these rules can be used:
```
public class JunitSystemRulesIntegration {
@Rule
public ExpectedExit expectedExit = ExpectedExit.none();
@Rule
public SystemOutputRule sysout = SystemOutputRule.sysOut();
@Test
public void iDoNotWantSysout() {
sysout.expectToBeEmpty();
//Fails
System.out.println("something");
}
@Test
public void iDoNotWantExit() {
//Fails
System.exit(1);
}
@Test
public void exitWithDiffentStatus() {
expectedExit.expectToExitWithStatus(2);
//Passes
System.exit(2);
}
