Simplified Junit 5
In this article, we will simply describe in simple words Junit 5. It has been around for a few years but developers are slow to adopt it. This article is here to explain its simpler and easily adaptable. I have highlighted some of the most important bullet points.
Here we explain what is Junit 5 and how is different from junit4.
Junit 5 Platform:
- New Platform
2. Lambdas Java 8+
3.TestEngine API
4. Launching Framework into JVM
JUnit Vintage supports backwards-compatible:
- Backwards compatible to Junit 4
2. Backwards compatible to Junit 3
3rd Party Support
- Cucumber
2. Specsys
What is Jupiter?
- Custom display names
@DisplayName
2. Custom DisplayName Generator
3. @Tag
4. Tag Expression Language
5. Visibility
6. Lambda functions
@Test@DisplayName("+")void addStrings() { assertEquals("OneTwo", "One"+"Two", () -> { return "We can lazily display message if fails."; });}
Please note failure message comes later like created lazily. It only built upon failure hence speedy response.
Exception Support
@Test
@DisplayName(“Number format exception”)
void numberFormatExceptionTest() {
final Integer a = 1;
final Integer b = 0;
Exception exception = assertThrows(NumberFormatException.class, () -> Integer.parseInt(“Five”));
assertEquals(“For input string: \”Five\””, exception.getMessage());
}
Lifecycle support
@BeforeAllstatic void initAll() {}@BeforeEachvoid init() {}@AfterEachvoid tearDown() {}@AfterAllstatic void tearDownAll() {}
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