What is API Gateway? What is a Canary release? Different types of tests for microservices. What are the best practices to design Microservices? Have you used SafeAreaView in your react-native project? Why did you use it? Difference between declarative and imperative programming?
Difference between const vs Object. What is Redux middleware? What is the main difference between useRef and useState hooks? What is Strict Mode in React? Explain useFocusEffect hook in React-native. What are the Class component lifecycle methods in React? Mention the differences between redux persist and redux offline packages if you have used it. Explain Spring cloud annotations. What are Reactive Extensions in Microservices?
Also this site includes many practical examples. Java 5 annotations for setup and teardown before and after instead of setUp and tearDown. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 10 years, 4 months ago. Active 6 years, 1 month ago. Viewed 16k times. Improve this question. Every time you want to make sure that an exception is thrown, you can use an expected parameter with the Test annotation.
Listing A. Another parameter you can add to the Test annotation is the timeout parameter. With this parameter, you can specify a value in milliseconds that you expect to be the upper limit of the time you spend executing your test.
What happens when the time runs out? This section briefly covers some of the new JUnit runners included in JUnit 4. The 3. The old way of constructing sets of your tests involved writing a suite method and manually inserting all the tests that you want to be present in the suite. Because the new version of JUnit is annotation oriented, it seems somehow logical that the construction of suites is also done by means of annotation.
Further, the suite construction is done not by one annotation but by two annotations: the RunWith and SuiteClasses annotations.
The first annotation lets you define test runners that you can use to run your tests. The RunWith annotation accepts a parameter called value , where you need to specify the test runner to run your suite: Suite. This test runner is included with JUnit, along with some other runners.
But in this annotation you can also specify a custom runner. You can find out how to implement your own JUnit runners in appendix B. The second annotation declares all the tests that you want to include in the suite. You list the classes that hold your tests in the value parameter of the SuiteClasses annotation. Some people find the way test suites are done in JUnit 4. Remember that you can include the BeforeClass and AfterClass annotated methods in the suite.
As you saw, the RunWith annotation lets you define a test runner to use. The Suite test runner that we already presented lets you run your test cases in a suite. This test runner lets you run the same tests with different input test data. We know that an example is worth several pages of explanation, so listing A. Imagine that we have a squareRoot method in our Calculator class that we want to test.
This listing demonstrates how to test this method with different input test data. We start by declaring the use of the Parameterized test runner at. Then, at , we define the static data method that we annotate with Parameters , denoting that this method returns the actual test data for our test. This test data is made from a java. List , and each element of the List is a two-dimensional array, the elements of which will be used to make a new instance of the SquareRootTest.
At we fill in the test data and return it. At we start the test method, and inside it we instantiate the Calculator object. This final section deals with the new assertion and assumption mechanisms introduced in JUnit 4. It also reveals the integration between JUnit and the Hamcrest matcher—something that allows you to write useful match statements to simplify your assertions.
In version 4. The org. CoreMatchers and org. JUnitMatchers packages are distributed with JUnit and contain numerous matchers. If you find them insufficient, you can always get the full Hamcrest project from the internet and use any of those matchers with JUnit. As a developer, you always strive to execute your tests against various scenarios. This may mandate that your test cases run in Windows boxes and not in Linux boxes.
It would be good if you could make an assumption as to what the character separator is and execute the tests only if your assumption is correct. With the 4. You can assume that a given condition is set and then assert that the tests pass. Consider listing A. As you can see, we use the assumeThat method to make sure the file separator is UNIX style and then assert that the database configuration file path is correct.
0コメント