Episode 1: Smoke Test, Regression Test, Integration Test and System Test

Smoke Test

📘 Definition

A quick, high-level test to check whether the basic functionalities of the system work after a new build.

🎯 Purpose

👉 “Is the build stable enough for further testing?”

🧠 Example

• Can the system start?
• Can users log in?
• Basic navigation works?

⏱️ When

• After every new build / deployment

Regression Test

📘 Definition

Re-testing existing functionality to ensure new changes didn’t break anything

🎯 Purpose

👉 “Did we accidentally break something?”

🧠 Example

• After adding a new feature, check:
  • Login still works
  • Old reports still generate

⏱️ When

• After any change (bug fix, enhancement, update)

System Test

📘 Definition

Testing the entire system as a whole (end-to-end)

🎯 Purpose

👉 “Does the complete system meet requirements?”

🧠 Example

• User places order → Payment → Confirmation → Email

⏱️ When

• After integration testing is complete

Integration Testing

📘 Definition

Testing how different modules/components work together

🎯 Purpose

👉 “Do these parts interact correctly?”

🧠 Example

• Frontend → Backend → Database
• Payment gateway → Order system

⏱️ When

• After individual modules are developed