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如何使用Junit

如何使用Junit

作者: Zavier_copy | 来源:发表于2020-06-11 15:21 被阅读0次

    1.需要在build.gradle里导入依赖库

    testImplementation'junit:junit:4.12'
    

    2.添加类注解

    @RunWith(JUnit4.class)
    

    3.以下是常用的使用方法:

    @RunWith(JUnit4.class)
    public class JunitTest {
        @Before
        public void initData() {
        System.out.println("初始化");
        }
    
        @After
        public void releaseData(){
        System.out.println("内存释放");
        }
    
        @Test
        public void testAssertArrayEquals() {
        byte[] expected ="trial".getBytes();
        byte[] actual ="trial".getBytes();
        System.out.println("testAssertArrayEquals");
        assertArrayEquals("failure - byte arrays not same", expected, actual);
        }
    
        @Test
        public void testAssertEquals() {
        assertEquals("failure - strings are not equal","text","text");
        }
    
        @Test
        public void testAssertFalse() {
        assertFalse("failure - should be false",false);
        }
    
        @Test
        public void testAssertNotNull() {
        assertNotNull("should not be null",new Object());
        }
    
        @Test
        public void testAssertNotSame() {
        assertNotSame("should not be same Object",new Object(),new Object());
        }
    
        @Test
        public void testAssertNull() {
        assertNull("should be null",null);
        }
    
        @Test
        public void testAssertSame() {
        Integer aNumber = Integer.valueOf(768);
        assertSame("should be same", aNumber, aNumber);
        }
    
        // JUnit Matchers assertThat
        @Test
        public void testAssertThatBothContainsString() {
        assertThat("albumen",both(containsString("a")).and(containsString("b")));
        }
    
        @Test
        public void testAssertThatHasItems() {
        assertThat(Arrays.asList("one","two","three"),hasItems("one","three"));
    
         }
    
        @Test
        public void testAssertThatEveryItemContainsString() {
        assertThat(Arrays.asList(new String[] {"fun","ban","net" }),everyItem(containsString("n")));
        }
    
        @Test
        public void testAssertTrue() {
        assertTrue("failure - should be true",true);
        }
    
         /**
         * 一般用 @Rule 注解来初始化一个对象,然后在测试方法中使用这个实例
        * 示例先初始化一个 ExpectedException 实例,然后使用 expect 方法判断抛出的异常是否是 
           IndexOutOfBoundsException */
        @Rule
        public ExpectedExceptionexception = ExpectedException.none();
        @Test
        public void testRule() {
        exception.expect(IndexOutOfBoundsException.class);
         throw new IndexOutOfBoundsException();
        }
    }
    

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