如果你添加Hamcrest和JUnit4，你可以这样做:

String x = "foo bar";
Assert.assertThat(x, CoreMatchers.containsString("foo"));

使用一些静态导入，它看起来好多了:

assertThat(x, containsString("foo"));

所需的静态导入是:

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.CoreMatchers.containsString;

EDIT: assertj可能有更多断言(一个fork)

assertThat(x).contains("foo");

太晚了，但只是更新一下，我用下面的语法完成了它

import org.hamcrest.core.StringContains;
import org.junit.Assert;

Assert.assertThat("this contains test", StringContains.containsString("test"));

示例(junit版本- 4.13)

import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;

public class TestStr {

@Test
public void testThatStringIsContained(){
    String testStr = "hi,i am a test string";
    assertThat(testStr).contains("test");
 }

}

我写了这个效用法

public static void assertContains(String string, String subString) {
    Assertions.assertTrue(string.contains(subString));
}

与Hamcrest一起使用新的assertThat语法。

它可以从JUnit 4.4开始使用。