2015-02-27 13:26:35 +00:00
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### 35.4.3. OutputCapture
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OutputCapture是一个JUnit Rule，用于捕获System.out和System.err输出。只需简单的将捕获声明为一个@Rule，并使用toString()断言：
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```java
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import org.junit.Rule;
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import org.junit.Test;
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import org.springframework.boot.test.OutputCapture;
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import static org.hamcrest.Matchers.*;
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import static org.junit.Assert.*;
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public class MyTest {
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@Rule
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public OutputCapture capture = new OutputCapture();
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@Test
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public void testName() throws Exception {
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System.out.println("Hello World!");
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assertThat(capture.toString(), containsString("World"));
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}
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}
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```
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