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Express.js Testing

Express.js testing ka matlab hai ke tumhare Express application ke routes, middleware, services,…

Overview

Express.js Testing — Quick Facts

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Property: Detail

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Full Name: Express.js Testing

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Category: Software Testing, Quality…

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Framework: Express.js (Node.js)

Topic 1

Kyun Zaroori Hai

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Bugs early pakdo — development me…

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Refactoring confidence — tests…

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Documentation — tests code ka…

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Regression prevent — purane…

Topic 2

Testing Types

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Kya test hota hai: Individual…

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Speed: Fastest (milliseconds per…

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Dependencies: Mocked/stubbed

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Example: calculateTotal(items)…

Topic 3

Testing Tools Comparison

🎯 | Tool | Type | Pros | Cons | Best For | |---|---|---|---|---| | Jest | Framework +…

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Test Structure — AAA Pattern

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Test data setup karo

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Mocks/stubs configure karo

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Prerequisites prepare karo

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Actual function/endpoint call karo

Topic 5

Route Testing

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Status codes — 200, 201, 400, 401,…

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Response body — correct data…

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Headers — Content-Type, auth…

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Error responses — proper error…

Topic 6

Middleware Testing

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Middleware function ko directly…

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Verify karo ke next() call hui, ya…

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Dependencies mock karo

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Supertest se route hit karo jo…

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Service Layer Testing

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Database/external dependencies…

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Service function call karo with…

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Output assert karo

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Side effects verify karo (mock…

Topic 8

Database Testing

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DB library mock karo…

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Fastest — koi real DB nahi

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Limitation: Schema/query…

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MongoDB → mongodb-memory-server

Topic 9

Mocking aur Stubbing

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Real dependency ki jagah fake…

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Behavior control karo (kya return…

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Call tracking (kitni baar call…

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Real function ka behavior…

Topic 10

Code Coverage

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Statements — kitne statements…

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Branches — kitne if/else branches…

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Functions — kitni functions call…

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Lines — kitni lines execute hui

Topic 11

CI/CD Integration

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GitHub Actions —…

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GitLab CI — .gitlab-ci.yml

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Jenkins — Jenkinsfile

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CircleCI — .circleci/config.yml

Topic 12

Testing Flow Diagram

⭐ `mermaid flowchart TD Dev[Developer Writes Code] --> UT[Unit Tests - Jest/Mocha] UT…

Topic 13

Best Practices

🔑 1. Test pyramid follow karo — zyada unit tests, medium integration, kam E2E 2. Tests…

Comparison

Testing Tools Comparison

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Jest: Framework + Runner + Assertion +…

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Mocha: Framework + Runner

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Chai: Assertion Library

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Express.js Testing ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Express.js Testing ka 'Full Name' kya hai?

Complete! 🎉

Express.js Testing Complete!

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