What is assertThat?
The assertThat is one of the JUnit methods from the Assert object that can be used to check if a specific value match to an expected one. It primarily accepts 2 parameters. First one if the actual value and the second is a matcher object.
What is the difference between assertThat and assertEquals?
Everyone says that we should use the new assertThat from Junit, but, for big Strings comparison it’s seems to be some lack of feature. assertEquals prints an easier to read error message: org. junit.
What is the function of fail String message?
fail(String message) Fails a test with the given message. Parameters: message the identifying message for the AssertionError (null okay)
What can I use instead of assertThat?
assertThat method is deprecated. Its sole purpose is to forward the call to the MatcherAssert. assertThat method defined in Hamcrest 1.3. Therefore, it is recommended to directly use the equivalent assertion defined in the third party Hamcrest library.
What is a JUnit rule?
A JUnit rule lets you define tasks that are common in your test class codebase and let you use it in your test class. You utilize the composition principle instead of inheritance when you use a JUnit rule in a test class. A JUnit rule is declared through the @Rule annotation in the test class.
Why assertThat is deprecated?
What can I use instead of assertEquals?
Consider assertThat() in place of assertEquals() Have a look and consider using it in place of assertEquals().
Is assertThat deprecated?
What is assertTrue in JUnit?
In assertTrue, you are asserting that the expression is true. If it is not, then it will display the message and the assertion will fail. In assertFalse, you are asserting that an expression evaluates to false. If it is not, then the message is displayed and the assertion fails.
How does assert failure work?
The assert. fail() function throws an AssertionError with the provided the error message or with a default error message. Parameters: This function accepts following parameters as mentioned above and described below: message This parameter holds the error message of string or error type.
What does assert null do?
The assertNull() method means “a passed parameter must be null “: if it is not null then the test case fails. assertNotNull asserts that the object is not null. If it is null the test fails, so you want that.
Is there a problem with the assert error?
The problem here is that the assertion error doesn’t report the values for expected and actual. Granted the expected value is easy to find, but a debugging session will probably be needed to figure out the actual value. Now let’s look at the same test using assertThat:
What are the benefits of using assertthat instead of assert?
The first benefit is that assertThat is more readable than the other assert methods. For example take a look at the following assertEquals method: assertEquals(expected, actual); We’ve all seen this many times, the expected value is passed in first and actual second, but it’s very cryptic until you get used to it.
What is the syntax for assertthat in Java?
The method name was assertThat, and the syntax looked like this: assertThat(x, is(3)); assertThat(x, is(not(4))); assertThat(responseString, either(containsString(“color”)).or(containsString(“colour”))); assertThat(myList, hasItem(“3”)); More generally: assertThat([value], [matcher statement]); Advantages of this assertion syntax include:
What’s the difference between assertthat and matchers?
It uses what’s called matchers which are self-contained classes which have static methods that get used with the assertThat method. These static methods can be chained which gives a lot of flexibility over using the old assert methods. Below we’ll go over some of the benefits of using assertThat over the old methods.