Boundary Value Test Data Cheat Sheet — Every Edge Case You Need

2026-07-17 · By Avinash Kamble, reviewed by Priyanka G.

Great testers don't guess edge cases — they use a canonical list. Print this cheat sheet and paste it into every test plan.

0, 1, -1
INT32_MAX = 2147483647
INT32_MIN = -2147483648
INT64_MAX = 9223372036854775807
Any int with leading zeros: "007"
Any int with thousands separator: "1,000"
Scientific: "1e10"
NaN, Infinity

Empty ""
Single space " "
Long: 255, 256, 1000, 10000 chars
Unicode: "café", "日本語", "🙂"
RTL: "مرحبا"
Zero-width space: "\u200B"
SQL injection: "'; DROP TABLE users;--"
XSS: "<script>alert(1)</script>"
Path traversal: "../../etc/passwd"

1970-01-01T00:00:00Z (epoch)
2000-02-29 (leap year)
2100-02-29 (invalid — not a leap year)
2038-01-19T03:14:07Z (Y2038)
DST transitions (2nd Sun March, 1st Sun Nov)
Time zones: UTC, +14:00, -12:00

0-byte file
1-byte file
Max allowed size + 1
Mismatched extension (.jpg with PNG bytes)
Filename with spaces, unicode, emoji
Filename > 255 chars

Every value above is preloaded in the "Boundary" preset of the Random Test Data Generator. Click, export CSV, feed into your data-driven runner.