unit-test-boundary-conditions

Test integer overflow and underflow in JUnit 5 by applying explicit checks using Math.addExact and Math.subtractExact to catch numeric limit exceptions. Parameterized tests validate behavior across Integer.MIN_VALUE, zero, and Integer.MAX_VALUE.

Handle floating-point precision in JUnit parameterized tests by using tolerance-based assertions. This ensures accurate comparisons for edge cases involving NaN and Infinity, preventing rounding errors from failing valid numeric calculations.

Cover null and empty string edge cases in Java unit tests by applying parameterized patterns for null, empty, and whitespace-only inputs. This systematically catches string boundary defects that commonly escape standard test coverage.

You can use parameterized tests for date and timezone extremes in Java to validate leap years, min/max dates, and timezone transitions. This ensures date calculations remain reliable across critical temporal boundaries.

JUnit 5 supports testing concurrent collection behavior and race conditions through specific patterns targeting thread safety. These tests validate resilience against concurrent modification and verify array index bounds under simultaneous access.