unit-test-boundary-conditions
Systematic JUnit 5 patterns for testing numeric limits, null/empty cases, and edge conditions.
- Covers numeric boundaries (Integer.MIN_VALUE, MAX_VALUE, zero), string edge cases (null, empty, whitespace), and collection sizes (empty, single, many)
- Includes parameterized test examples using
@ParameterizedTestand@ValueSourcefor efficient multi-case coverage - Demonstrates floating-point precision testing with tolerance-based assertions, overflow/underflow detection, and special values (NaN, Infinity)
- Provides date/time boundary patterns (leap years, month boundaries, midnight), array index testing, and concurrent access scenarios
Unit Testing Boundary Conditions and Edge Cases
Overview
Systematic patterns for testing boundary conditions, corner cases, and limit values in Java using JUnit 5. Covers numeric boundaries, string edge cases, collection states, floating-point precision, date/time limits, and off-by-one scenarios.
When to Use
- Numeric min/max limits, null/empty/whitespace inputs
- Overflow/underflow validation, collection boundaries
- Off-by-one errors, floating-point precision
Instructions
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