JUnit4的hamcrest示例

最新推荐文章于 2017-06-26 20:59:42 发布

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最新推荐文章于 2017-06-26 20:59:42 发布

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分类专栏： java test

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本文详细介绍了Java编程中Hamcrest库的使用方法，包括但不限于is、equalTo、instanceOf、not、notNullValue、nullValue、any、allOf、anyOf等方法的应用场景与实例。

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import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.StringDescription;
import org.junit.Test;

// 静态引用
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.assertThat;

public class TestHamcrest {
	
	@SuppressWarnings("unchecked")
	@Test
	public void test(){
		
		// is
		assertThat("Hello", is(is(is(is(notNullValue())))));
		assertThat(2 + 2, is(4));
	
		// equalTo 
		assertThat(2 + 2, is(equalTo(4)));
		assertThat(2 + 2, is(is(4)));
		
		// instanceOf
		assertThat("Hello", is(instanceOf(String.class)));
		assertThat("Hello", instanceOf(String.class));
		
		// not
		assertThat("Hello", is(not(instanceOf(Integer.class))));
		
		// notNullValue
		assertThat("Hello", is(notNullValue()));
		
		// nullValue
		assertThat("Hello", is(not(nullValue())));
		
		// any 用于验证class或superClass
		assertThat("Hello", is(any(String.class)));
		
		// allOf 满足所有条件
		assertThat("Hello", is(allOf(notNullValue(), instanceOf(String.class), equalTo("Hello"))));
		
		// anyOf 满足条件之一
		assertThat("Hello", is(anyOf(notNullValue(), instanceOf(String.class), equalTo("GoodBye"))));
		
		// not(allOf) 不满足条件之一
		assertThat("Hello", is(not(allOf(notNullValue(), instanceOf(Integer.class)))));
		
		// not(anyOf) 所有条件都不满足
		assertThat("Hello", is(not(anyOf(nullValue(), instanceOf(Integer.class), equalTo("GoodBye")))));
		
		// anything 永远为真
		assertThat(null, is(anything()));
		
		// sameInstance
		Integer i = 1;
		assertThat(i, is(sameInstance(1)));
		
		// describedAs 重写某个Matcher的描述
		Matcher<?> matcher = describedAs("My description", anything());
		Description desc = new StringDescription().appendDescriptionOf(matcher);
		assertThat("My description", is(desc.toString()));
		
	}
}