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#unit-tests

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Article0 replies4,643 followingPosted 14 May 2026, 15:04 UTC52.3K views3,175 votes

Choosing Between jest.fn() and jest.spyOn() for Dependency Isolation

Stop fighting leaky tests. Learn when to use jest.fn() for standalone mocks versus jest.spyOn() for tracking existing methods to create isolated, deterministic unit tests.

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jest javascript-testing

TB

Tasadduq Burneyowner

Started14 May 2026, 15:04 UTC

Level 32Owner25,025 rep points