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It supports creating customized assertion matchers ('Hamcrest' is an anagram of 'matchers'), allowing match rules to be defined declaratively. [1] These matchers have uses in unit testing frameworks such as JUnit and jMock. Hamcrest has been included in JUnit 4 since 2007, [2] but was omitted from JUnit 5 in 2017. [3]
The JUnit team decided not to put all features within the JUnit core, and instead decided to give an extensible way for developers to address their concerns. [14] In JUnit 4, there are two extension mechanisms: the Runner API and Rule API. [15] There were some disadvantages to both the Runner API and the Rule API.
In computer programming, specifically when using the imperative programming paradigm, an assertion is a predicate (a Boolean-valued function over the state space, usually expressed as a logical proposition using the variables of a program) connected to a point in the program, that always should evaluate to true at that point in code execution.
A unit test is code that is written to execute a specific function in the code to be tested and usually targets a small unit of code, such a single method or class. Using a combination of assert statements and other test statements, programmers can create suites of test cases in order to tell if a method or function is being executed properly. [5]
In computer software testing, a test assertion is an expression which encapsulates some testable logic specified about a target under test. The expression is formally presented as an assertion, along with some form of identifier, to help testers and engineers ensure that tests of the target relate properly and clearly to the corresponding specified statements about the target.
A key contribution of this early work was simple (almost simplistic) oracle. A program failed its test if it crashed or hung under the random input and was considered to have passed otherwise. While test oracles can be challenging to construct, the oracle for this early fuzz testing was simple and universal to apply.
A test case is the smallest part of a test that generally encodes a simple path through the software under test. The test case code prepares input data and environmental state, invokes the software under test and verifies expected results. A programmer writes the code for each test case.
For example, suppose the goal of your program is to allow people to convert digital camera photos into a web photo album. If you sit down a group of average users with your program and ask them all to complete this task, then the more usable your program is, the higher the percentage of users that will be able to successfully create a web photo ...