Boundary Value Analyzer
Calculate boundary values for thorough edge case testing
Analyze Boundary Values
What is Boundary Value Analysis?
Boundary Value Analysis (BVA) is a testing technique that focuses on testing at the boundaries between partitions. Errors tend to occur at the extremes of input ranges.
Why it matters: Most defects occur at boundary conditions, making BVA one of the most effective testing techniques.
Testing Approach
Test these values:
- Minimum valid value
- Just above minimum
- Maximum valid value
- Just below maximum
- Just below minimum (invalid)
- Just above maximum (invalid)
- Middle value (normal case)
No Analysis Performed Yet
Enter boundary values and click "Analyze Boundaries"
Why Boundary Value Analysis?
Common Boundary Errors:
- Off-by-one errors: Using < instead of <= in conditions
- Array index errors: Accessing elements outside array bounds
- Buffer overflows: Writing beyond allocated memory
- Integer overflow: Numbers exceeding data type limits
- Division by zero: Not handling zero denominators
Benefits of BVA:
- Finds defects with fewer test cases
- Focuses testing on high-risk areas
- Complements equivalence partitioning
- Systematic and methodical approach
- Easy to automate boundary tests
Example Scenarios
Test Values:
- 17 (invalid - too young)
- 18 (valid - minimum)
- 19 (valid - above minimum)
- 41 (valid - middle)
- 64 (valid - below maximum)
- 65 (valid - maximum)
- 66 (invalid - too old)
Test Values:
- 7 characters (invalid - too short)
- 8 characters (valid - minimum)
- 9 characters (valid - above minimum)
- 14 characters (valid - middle)
- 19 characters (valid - below maximum)
- 20 characters (valid - maximum)
- 21 characters (invalid - too long)