Edge cases minangka input lan kondisi sing aneh utawa ing wates dene bug asring bersembunyi — input kosong, wates, null, nilai gedhe, error. Ngest sing efektif ngluwihi "happy path" kanggo nutupi iki, amarga edge cases minangka sumber umum saka defect nyata.
Mangapa edge cases penting
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The HAPPY PATH (normal, expected inputs) usually works. BUGS hide in EDGE CASES:
→ unusual inputs, boundaries, error conditions, unexpected states
→ testing only the happy path misses where defects actually occur
→ Thorough testing covers edge cases — that's where it adds the most value.
Kategori umum edge cases
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EMPTY / NULL → empty string/list/collection, null/undefined, missing values
BOUNDARIES → min/max values, 0, -1, off-by-one (first/last element, limits)
LARGE / extreme → very large inputs, long strings, huge numbers, overflow
INVALID → wrong types, malformed data, out-of-range, special characters
ERROR conditions → network failures, exceptions, timeouts, unavailable dependencies
STATE → empty/initial state, concurrent access, unexpected sequences of actions
SPECIAL values → negative numbers, zero, duplicates, unicode/emoji, very small/large