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贾康 edited this page Jul 22, 2016 · 2 revisions

JUnit 为基本类型和对象以及数组(基本类型或对象)提供了重载的断言方法。参数的顺序是期望值和实际值。可选的第一个值是错误情况的消息。有一个略微不同的断言是 assertThat 它需要的参数是一个可选的失败消息，实际返回值和一个 Matcher 对象。值得注意的是，相比其他断言方法预期和实际是相反的。

例子

所有有代表性的断言方法。

import static org.hamcrest.CoreMatchers.allOf; import static org.hamcrest.CoreMatchers.anyOf; import static org.hamcrest.CoreMatchers.equalTo; import static org.hamcrest.CoreMatchers.not; import static org.hamcrest.CoreMatchers.sameInstance; import static org.hamcrest.CoreMatchers.startsWith; import static org.junit.Assert.assertThat; import static org.junit.matchers.JUnitMatchers.both; import static org.junit.matchers.JUnitMatchers.containsString; import static org.junit.matchers.JUnitMatchers.everyItem; import static org.junit.matchers.JUnitMatchers.hasItems; import java.util.Arrays; import org.hamcrest.core.CombinableMatcher; import org.junit.Test; public class AssertTests { @Test public void testAssertArrayEquals() { byte[] expected = "trial".getBytes(); byte[] actual = "trial".getBytes(); org.junit.Assert.assertArrayEquals("failure - byte arrays not same", expected, actual); } @Test public void testAssertEquals() { org.junit.Assert.assertEquals("failure - strings are not equal", "text", "text"); } @Test public void testAssertFalse() { org.junit.Assert.assertFalse("failure - should be false", false); } @Test public void testAssertNotNull() { org.junit.Assert.assertNotNull("should not be null", new Object()); } @Test public void testAssertNotSame() { org.junit.Assert.assertNotSame("should not be same Object", new Object(), new Object()); } @Test public void testAssertNull() { org.junit.Assert.assertNull("should be null", null); } @Test public void testAssertSame() { Integer aNumber = Integer.valueOf(768); org.junit.Assert.assertSame("should be same", aNumber, aNumber); } // JUnit Matchers assertThat @Test public void testAssertThatBothContainsString() { org.junit.Assert.assertThat("albumen", both(containsString("a")).and(containsString("b"))); } @Test public void testAssertThathasItemsContainsString() { org.junit.Assert.assertThat(Arrays.asList("one", "two", "three"), hasItems("one", "three")); } @Test public void testAssertThatEveryItemContainsString() { org.junit.Assert.assertThat(Arrays.asList(new String[] { "fun", "ban", "net" }), everyItem(containsString("n"))); } // Core Hamcrest Matchers with assertThat @Test public void testAssertThatHamcrestCoreMatchers() { assertThat("good", allOf(equalTo("good"), startsWith("good"))); assertThat("good", not(allOf(equalTo("bad"), equalTo("good")))); assertThat("good", anyOf(equalTo("bad"), equalTo("good"))); assertThat(7, not(CombinableMatcher.<Integer> either(equalTo(3)).or(equalTo(4)))); assertThat(new Object(), not(sameInstance(new Object()))); } @Test public void testAssertTrue() { org.junit.Assert.assertTrue("failure - should be true", true); } }
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