代码提升篇-JUnit4详细解析下

package tech.pdai.junit4;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * Hello world test.
 *
 * @author pdai
 */
public class HelloWorldTest {

    @Test
    public void firstTest() {
        assertEquals(2, 1 + 1);
    }
}

package tech.pdai.junit4;

import org.junit.*;

/**
 * Standard Test.
 */
public class StandardTest {

    @BeforeClass
    public static void beforeClass() {
        System.out.println("in before class");
    }

    @AfterClass
    public static void afterClass() {
        System.out.println("in after class");
    }

    @Before
    public void before() {
        System.out.println("in before");
    }

    @After
    public void after() {
        System.out.println("in after");
    }

    @Test
    public void testCase1() {
        System.out.println("in test case 1");
    }

    @Test
    public void testCase2() {
        System.out.println("in test case 2");
    }

}

package tech.pdai.junit4;

import org.junit.Ignore;
import org.junit.Test;

/**
 * Ignore Test.
 */
public class IgnoreTest {

    /**
     * ignore.
     */
    @Ignore
    @Test
    public void ignoreTest(){
        System.out.println("ignore test");
    }
}

package tech.pdai.junit4;

import org.junit.Assert;
import org.junit.Test;

/**
 * Assertion Test.
 */
public class AssertionTest {

    @Test
    public void test() {
        String obj1 = "junit";
        String obj2 = "junit";
        String obj3 = "test";
        String obj4 = "test";
        String obj5 = null;

        int var1 = 1;
        int var2 = 2;

        int[] array1 = {1, 2, 3};
        int[] array2 = {1, 2, 3};

        Assert.assertEquals(obj1, obj2);

        Assert.assertSame(obj3, obj4);
        Assert.assertNotSame(obj2, obj4);

        Assert.assertNotNull(obj1);
        Assert.assertNull(obj5);

        Assert.assertTrue(var1 < var2);
        Assert.assertFalse(var1 > var2);

        Assert.assertArrayEquals(array1, array2);

    }
}

package tech.pdai.junit4;

import org.hamcrest.core.CombinableMatcher;
import org.junit.Test;

import java.util.Arrays;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

/**
 * More Assertion Test from Junit-Team.
 */
public class Assertion2Test {

    @Test
    public void testAssertArrayEquals() {
        byte[] expected = "trial".getBytes();
        byte[] actual = "trial".getBytes();
        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")));
    }

    // 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() {
        assertTrue("failure - should be true", true);
    }
}

package tech.pdai.junit4;

import org.junit.Test;

/**
 * Exception Test.
 */
public class ExceptionTest {

    @Test(expected = ArithmeticException.class)
    public void exceptionTest() {
        System.out.println("in exception success test");
        int a = 0;
        int b = 1 / a;
    }

    @Test(expected = NullPointerException.class)
    public void exceptionFailTest() {
        System.out.println("in exception fail test");
        int a = 0;
        int b = 1 / a;
    }
}

in exception success test
in exception fail test

java.lang.Exception: Unexpected exception, expected<java.lang.NullPointerException> but was<java.lang.ArithmeticException>

	at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:28)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: java.lang.ArithmeticException: / by zero
	at tech.pdai.junit4.ExceptionTest.exceptionFailTest(ExceptionTest.java:21)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:19)
	... 14 more

package tech.pdai.junit4;

import org.junit.Test;

import java.util.concurrent.TimeUnit;

/**
 * Timeout Test.
 */
public class TimeoutTest {

    @Test(timeout = 1000)
    public void testCase1() throws InterruptedException {
        TimeUnit.SECONDS.sleep(5000);
        System.out.println("in timeout exception");
    }
}

org.junit.runners.model.TestTimedOutException: test timed out after 1000 milliseconds

	at java.lang.Thread.sleep(Native Method)
	at java.lang.Thread.sleep(Thread.java:340)
	at java.util.concurrent.TimeUnit.sleep(TimeUnit.java:386)
	at tech.pdai.junit4.TimeoutTest.testCase1(TimeoutTest.java:14)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:748)

package tech.pdai.junit4;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * Timeout Rule.
 */
public class HasGlobalTimeoutTest {

    public static String log;

    private final CountDownLatch latch = new CountDownLatch(1);

    @Rule
    public Timeout globalTimeout = Timeout.seconds(10); // 10 seconds max per method tested

    @Test
    public void testSleepForTooLong() throws Exception {
        log += "ran1";
        TimeUnit.SECONDS.sleep(100); // sleep for 100 seconds
    }

    @Test
    public void testBlockForever() throws Exception {
        log += "ran2";
        latch.await(); // will block
    }
}

package tech.pdai.junit4;

/**
 * PrimeNumberChecker.
 */
public class PrimeNumberChecker {

    public Boolean validate(final Integer parimeNumber) {
        for (int i = 2; i < (parimeNumber / 2); i++) {
            if (parimeNumber % i == 0) {
                return false;
            }
        }
        return true;
    }
}

package tech.pdai.junit4;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.util.Arrays;
import java.util.Collection;

/**
 * Parameterized Test.
 *
 */
@RunWith(Parameterized.class) // 步骤一: 指定定参数运行器
public class PrimeNumberCheckerTest {

    /**
     * 步骤二：声明变量
     */
    private Integer inputNumber;
    private Boolean expectedResult;
    private PrimeNumberChecker primeNumberChecker;

    /**
     * 步骤三：为测试类声明一个带有参数的公共构造函数，为变量赋值
     */
    public PrimeNumberCheckerTest(Integer inputNumber,
                                  Boolean expectedResult) {
        this.inputNumber = inputNumber;
        this.expectedResult = expectedResult;
    }

    /**
     * 步骤四：为测试类声明一个使用注解 org.junit.runners.Parameterized.Parameters 修饰的，返回值为
     * java.util.Collection 的公共静态方法，并在此方法中初始化所有需要测试的参数对
     *   1）该方法必须由Parameters注解修饰
     2）该方法必须为public static的
     3）该方法必须返回Collection类型
     4）该方法的名字不做要求
     5）该方法没有参数
     */
    @Parameterized.Parameters
    public static Collection primeNumbers() {
        return Arrays.asList(new Object[][]{
                {2, true},
                {6, false},
                {19, true},
                {22, false},
                {23, true}
        });
    }

    @Before
    public void initialize() {
        primeNumberChecker = new PrimeNumberChecker();
    }

    /**
     * 步骤五：编写测试方法，使用自定义变量进行测试
     */
    @Test
    public void testPrimeNumberChecker() {
        System.out.println("Parameterized Number is : " + inputNumber);
        Assert.assertEquals(expectedResult,
                primeNumberChecker.validate(inputNumber));
    }
}

package tech.pdai.junit4.testsuite;

import org.junit.Test;

public class JunitTest1 {

    @Test
    public void printMessage(){
        System.out.println("in JunitTest1");
    }
}

package tech.pdai.junit4.testsuite;

import org.junit.Test;

public class JunitTest2 {

    @Test
    public void printMessage(){
        System.out.println("in JunitTest2");
    }
}

package tech.pdai.junit4.testsuite;

import org.junit.runner.RunWith;
import org.junit.runners.Suite;

/**
 * Test suite.
 */
@RunWith(Suite.class)
@Suite.SuiteClasses({
        /**
         * 此处类的配置顺序会影响执行顺序
         */
        JunitTest1.class,
        JunitTest2.class
})
public class JunitSuiteTest {
}

package tech.pdai.junit4;

import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;

/**
 * Order.
 */
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class TestMethodOrder {

    @Test
    public void testA() {
        System.out.println("first");
    }

    @Test
    public void testC() {
        System.out.println("third");
    }

    @Test
    public void testB() {
        System.out.println("second");
    }
}