Jasmine JavaScript Testing Framework Cheat Sheet 2026

The 30 highest-yield Jasmine JavaScript Testing Framework facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Jasmine initially came out in → 2010
2. Aside from those listed below, Jasmine is influenced by → Npm
3. The Jasmine framework includes a feature called ___ that lets you spy on a particular line of code. → SpyOn()
4. Which matcher verifies that a number is close to an expected value within a decimal precision? → toBeCloseTo(num, decimalPlaces)
5. Which Jasmine function is used to specify a test suite? → `describe()`
6. As a testing framework, Jasmine is → Open Source
7. Which Jasmine matcher checks that a value is not undefined? → toBeDefined()
8. Can Jasmine describe blocks be nested inside each other? → Yes, to any depth
9. What is the purpose of jasmine.nothing() used as an asymmetric matcher? → Asserts that a spy was called with no arguments or matches any call with no arguments
10. Which reporter interface method does Jasmine call when a spec begins executing? → specStarted(result)
11. What does jasmine.clock().mockDate(new Date('2025-01-01')) do? → Sets the mocked current date to January 1, 2025
12. Which Jasmine function is used to indicate that a test specification is pending? → pending()
13. What is a "fixture" in Jasmine? → A sample input used for testing
14. What file is typically used to configure Jasmine in a Node.js project? → spec/support/jasmine.json
15. What is the purpose of jasmine.getEnv().clearReporters()? → Removes all currently registered reporters from the environment
16. How do you configure a Jasmine spy to invoke the original implementation? → .and.callThrough()
17. What had been created before Jasmine was created? → JSunit
18. What is the effect of having a focused spec (fit) or suite (fdescribe) in a Jasmine test file? → Only focused specs and suites run; all others are skipped
19. Which function inside an it() block marks that spec as pending in Jasmine? → pending()
20. Which of the following is a Jasmine.js substitute? → All of the above
21. What does the stopSpecOnExpectationFailure option do in Jasmine? → Stops the current spec after the first failed expectation
22. How do you disable an entire describe suite without deleting it? → xdescribe()
23. How do you use async/await syntax in a Jasmine it() block? → Declare the function as async and use await inside
24. How should the message property be structured in a custom matcher result object to provide context-sensitive failure output? → As a function that returns a string, so Jasmine evaluates it only when needed
25. Which jasmine.json option stops Jasmine from running further specs after a set number of failures? → failFast: true
26. What does the compare function inside a custom matcher need to return? → An object with a pass property (boolean) and optionally a message
27. What does jasmine.arrayContaining([3, 5]) verify about the actual array? → The actual array contains at least 3 and 5 (possibly more)
28. What does jasmine.getEnv().allowRespy(true) enable? → Calling spyOn on a method that is already a spy
29. Can afterEach() access variables that were modified inside the it() block that just ran? → Yes, because they share the describe block's closure scope
30. What argument types does jasmine.stringMatching() accept? → A string or a RegExp