Black Box Testing Techniques
Deep dive into Black Box Testing techniques including ECP, BVA, Error Guessing, Decision Table, and State Transition Testing
Lesson Overview
Today we'll explore the comprehensive Black Box Testing techniques that form the foundation of functional testing. You'll learn how to create effective test cases using proven methodologies and understand the specific functionality of different web elements.
Testing Techniques
5 core BBT methods
Web Elements
8 element functionalities
Practical Examples
Real-world scenarios
Black Box Testing Technique
Core Principles
- • In Black Box Testing technique we test application functionality with respect to client requirement
- • Black Box Testing is used to create the test cases
- • There are different techniques present in Black Box Testing technique
Black Box Testing Techniques
Equivalence Class Partitioning
We test which types of test data [value] are accepted by the text box [Object]
Example: First Name Text Box
• Valid inputs: Enter upper case and lower case values
• Invalid inputs: Enter special characters or numbers
• Expected result: Invalid inputs should return error message
Boundary Value Analysis
• In Boundary Value Analysis, we validate length or size of object
• We validate how much character test data is accepted by the text box
Example: First Name (3-8 characters)
Valid Boundary Tests:
- • 3 character test data (minimum)
- • 8 character test data (maximum)
- • 4/5 character test data (middle)
Invalid Boundary Tests:
- • Below 3 character test data
- • Above 8 character test data
- • Validate response for each case
Error Guessing Technique
- • We use our previous experience of application functionality to guess the errors
- • Many defects can be found using error guessing testing technique where most developers make mistakes
Example: Gender Radio Button
Test Gender radio button functionality - it should select only one option, but error occurs when both radio buttons can be selected simultaneously.
Decision Table Testing Technique
- • We write and test application functionality by providing multiple input conditions
- • We validate/check what expected outcome occurs after executing the test cases
- • Decision Table Testing Technique writes system behavior in table format
Example Application
Client Requirement: Test Facebook register page with multiple input combinations and validate expected outcomes for each scenario.
State Transition Technique
- • Every software functionality has various possible states
- • These states change from one to another based on user actions
- • State transition technique helps write test cases to cover all positive and negative functionalities
- • Events are triggered which become scenarios, and we test all scenarios
Example: Account Lockout
If we enter invalid credentials for the 4th time, then it blocks the account for the next 24 hours.
Web Elements & Their Functionality
Object-Functionality Mapping
Visual Examples & Diagrams
Black Box Testing Techniques - Visual Guide
ECP & BVA Detailed Examples
Explore comprehensive examples and tables demonstrating practical implementation of Equivalence Class Partitioning and Boundary Value Analysis techniques with real test scenarios.
ECP and BVA Examples Document - Day 3
Day 3 Knowledge Check
How many Black Box Testing techniques are covered in Day 3?
Key Takeaways
5 Black Box Testing Techniques
- ECP: Test data types (upper/lower case, numbers, special chars)
- BVA: Test length/size boundaries (min, max, invalid ranges)
- Error Guessing: Use experience to predict common errors
- Decision Table: Test multiple input combinations systematically
- State Transition: Test state changes based on user actions
BVA Testing Strategy
- Minimum boundary: Test exact minimum value
- Maximum boundary: Test exact maximum value
- Valid middle: Test values within range
- Below minimum: Test values below valid range
- Above maximum: Test values above valid range
Web Element Functions
- Text box: Enter, clear, delete, copy, paste, cut
- Radio button: Select only one option
- Checkbox: Select one or multiple options
- Dropdown: Single selection vs combo (multiple)
- Buttons/Links: Click functionality
Testing Applications
- ECP Example: First name validation (text types)
- BVA Example: Character length validation (3-8 chars)
- Error Guessing: Gender radio button selection
- State Transition: Account lockout after failed attempts
💡 Master these 5 Black Box Testing techniques to create comprehensive test cases that cover all functional scenarios and ensure thorough application validation.