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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