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Jasmine's <code>spyOn</code> lets you replace external dependencies (like HTTP calls) with controlled return values, ensuring your unit tests fast, isolated, and deterministic without hitting real services.
Jasmine's spyOn replaces one method on one object, records its calls, and restores the original after each spec. Here's how to pick the right strategy and avoid the common traps.
Learn how Jasmine’s native spies let you replace collaborators, track calls, and stub behaviour without adding a mocking library, plus pitfalls to avoid.
Learn how to use Jasmine’s spyOn and jasmine.createSpy to isolate units, verify interactions, and keep tests close to real interfaces. This guide covers setup, an example, trade‑offs, and how to validate your spies in real projects.
Spies let you replace real functions with mock implementations in Jasmine tests. This guide covers how to create spies, control return values, handle async calls, and avoid common pitfalls.
jasmine
javascript