在 JUnit 中的每个“@Test"之后和每个“@After"之前应用“@Rule"
我有一个测试套件，我在 @After 中退出系统并在 @AfterClass 中关闭浏览器.我正在尝试使用 @Rule 为每种测试方法使用 Selenium 获取失败的测试屏幕截图.我手动检查了 @Rule 仅在每个 @Before 之前运行，但我想在 @Test 之后和 @After 之前设置它.我找不到简单的解决方案.任何帮助将不胜感激.
I have a test suite where I am logging out of the system in @After and closing the browser in @AfterClass. I am trying to use @Rule to take failed test screenshot using Selenium for every test method. I checked manually that @Rule only runs before every @Before but I want to set it up after @Test and before @After. I couldn't find out simple solution. Any help will be appreciated.
public class MorgatgeCalculatorTest {
@Before
public void before(){
System.out.println("I am before");
}
@BeforeClass
public static void beforeclass(){
System.out.println("I am beforeclass");
}
@Test
public void test(){
System.out.println("I am Test");
}
@Test
public void test2(){
System.out.println("I am Test2");
}
@After
public void after(){
System.out.println("I am after");
}
@AfterClass
public static void afterclass(){
System.out.println("I am afterclass");
}
@Rule
ExpensiveExternalResource ExpensiveExternalResource = new ExpensiveExternalResource();
static class ExpensiveExternalResource implements MethodRule {
public ExpensiveExternalResource(){
System.out.println("I am rule");
}
@Override
public Statement apply(Statement arg0, FrameworkMethod arg1, Object arg2) {
// TODO Auto-generated method stub
return null;
}
}
我得到的输出是
I am beforeclass
I am rule
I am before
I am Test
I am after
I am rule
I am before
I am Test2
I am after
I am afterclass
推荐答案
由于规则的设置方式，您不能在@before 之后或@after 之前设置规则.您可以将规则想象成您放在测试方法上的 shell.第一个shell 是@before/@after.此后应用@rules.
Because of the way that rules are set up, you can't have a rule that comes after @before or before @after. You can think of rules like shells that you put on the test method. The first shell to go on is @before/@after. Thereafter the @rules are applied.
做你想做的事的一个快速方法是完全避免@After.可以创建一个规则，以便在方法失败时截取屏幕截图，然后在代码之后执行您的.它不像@After 那样漂亮，但它确实有效.(我也实现了 TestRule 因为 MethodRule 已被贬值).
A quick way to do what you want to do is to avoid @After altogether. A rule can be created so that it will take a screenshot if a method fails and then execute yours after the code. It isn't quite as pretty as @After, but it works. (also I implemented TestRule because MethodRule has been depreciated).
public class MortgageCalculatorTest {
@Before
public void before(){
System.out.println("I am before");
}
@BeforeClass
public static void beforeclass(){
System.out.println("I am beforeclass");
}
@Test
public void test(){
System.out.println("I am a Test");
}
@Test
public void test2(){
System.out.println("I am a Failed Test");
fail();
}
@AfterClass
public static void afterclass(){
System.out.println("I am afterclass");
}
@Rule
public ExpensiveExternalResource ExpensiveExternalResource = new ExpensiveExternalResource();
public static class ExpensiveExternalResource implements TestRule {
// public ExpensiveExternalResource(){}
public class ExpansiveExternalResourceStatement extends Statement{
private Statement baseStatement;
public ExpansiveExternalResourceStatement(Statement b){
baseStatement = b;
}
@Override
public void evaluate() throws Throwable {
try{
baseStatement.evaluate();
}catch(Error e){
System.out.println("I take a Screenshot");
throw e;
}finally{
after();
}
}
//Put your after code in this method!
public void after(){
System.out.println("I am after");
}
}
public Statement apply(Statement base, Description description) {
return new ExpansiveExternalResourceStatement(base);
}
}
}
规则的所有工作都在一个语句中完成.org.junit.runners.model.Statement 是一个代表代码包的类.所以这里的 apply 方法接收到你放置一个 shell 的代码包.Apply 返回执行您提供的代码包的语句，并用 try/catch 语句包围它以捕获方法失败.
All the work of the rule is done in a statement. A org.junit.runners.model.Statement is a class that represents a bundle of code. So here the apply method receives the bundle of code that you are putting a shell around. Apply returns your statement that executes the bundle of code that you gave it and surrounds it with a try/catch statement to catch the method failures.
这个方法的输出是:
I am beforeclass
I am before
I am a Test
I am after
I am before
I am a Failed Test
I take a Screenshot
I am after
I am afterclass
希望这会有所帮助！
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