Lesson 49 of 55
9 mins readUnit Testing & Test Suites (HUnit / Hspec)
In Plain English
Structure test suites with explicit unit assertions (@?=, assertEqual) and BDD descriptions (describe, it, shouldBe) to ensure software quality.
Deep Dive: How It Works
HUnit Assertions: assertEqual "label" expected actual verifies expected values.
Hspec BDD Style: describe "Calculator" $ it "adds numbers" $ (2 + 2) `shouldBe` 4.
Integration with CI: Automated test runs via stack test or cabal test.
Core Rules to Remember
Declarative Spec Hierarchy: Group tests logically with describe and it blocks.
Zero Runtime Assertions in Production: Separate test code cleanly from production builds.
Live Interactive Example
Hit Run Code to see it liveUnit Testing Assertions Runner
Python 3.12
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Output Console
Click "Run Code" to view the rendered output.
How it works: Both test assertions verified equality and printed PASS.
Your Turn: Micro Challenge
No pressure! Edit the starter code below and test your solution with instant feedback.
Micro Exercise
Run Unit Assertion
- Verify `5 * 5 == 25`.
- If `True`, print `"Unit test passed: 25"`.
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Sandbox Output
Click "Run & Check" to test your solution.
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