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Key features of Jasmine include:
BDD Syntax: Jasmine uses a syntax that closely resembles natural language, allowing developers to describe the behavior of their code in a more human-readable way. This makes the tests more understandable to both developers and non-developers.
Describe-It Structure: Tests in Jasmine are organized using the "describe" and "it" functions. The "describe" function groups related test cases, while the "it" function defines individual test cases with descriptive names.
Assertions: Jasmine provides a set of built-in assertion functions (matchers) that allow developers to define expected outcomes and compare them with actual results. These assertions include checks for equality, comparisons, truthiness, and more.
Before and After Hooks: Jasmine allows developers to set up preconditions and cleanup actions using "beforeEach," "beforeAll," "afterEach," and "afterAll" hooks. This ensures consistent test environments and avoids code duplication.
Spies and Mocks: Jasmine offers the ability to create spies, which are functions that can track calls and parameters to other functions. Spies are useful for testing interactions between different parts of the code, such as function calls and callbacks.
Matchers: Jasmine includes a wide range of matchers that enable developers to perform various types of comparisons, including deep object comparisons, regular expressions, and custom matchers.
Nested Describes: Jasmine supports nesting "describe" blocks, allowing developers to further organize and structure their tests.
Async Testing: Jasmine provides mechanisms for testing asynchronous code using techniques like callbacks, promises, and async/await.
Custom Matchers: Developers can create custom matchers to extend the capabilities of Jasmine and make tests more readable.
Focused and Excluded Suites: Developers can focus on running specific test suites or exclude certain suites from execution.
Extensibility: Jasmine is extensible and can be integrated with other tools and libraries.