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Software testing with JavaScript_ a quick guide

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who am I_ {twitter, youtube, linkedin…}.lsantos.dev software engineer_ hello@lsantos.dev

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software testing

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software tests are untested software that tests your software

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why?

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why automated testing? ➔ Improves software quality ➔ Prevent errors before they're published ➔ Builds trust in the codebase ◆ Changes can be published faster

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tests should be ➔ Deterministic ➔ Self-contained ➔ Predictable ➔ Small

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What to test?

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Functionality

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What not to test?

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Implementation

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let's hack!

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test runners_ giving us an edge on tests

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let's hack!

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test doubles_

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Types of doubles ➔ Spies ◆ Adds instrumentation to a function/object ◆ Actually calls the function but gathers metadata ➔ Stubs ◆ Replaces a function for a fake implementation ◆ Adds instrumentation ◆ Returns a fixed value ➔ Mocks ◆ "Smarter" stubs ◆ Have predefined expectations on interactions ◆ Focused on the interaction, not on behaviour

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let's hack!

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TDD Test Driven Development

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thank you_ lsantos.dev