What edge cases (negative, NaN, Infinity) are tested?

The repository has comprehensive edge case testing for invalid inputs and special numeric values:

Invalid Input Types [test.js:L1-L40]:

• Empty string, non-numeric strings, null, and boolean true all throw errors
• Number.NaN, Number.POSITIVE_INFINITY, and Number.NEGATIVE_INFINITY all throw errors

Negative Numbers [test.js:L51-L60]:

• Negative decimals: -0.4, -0.7, -10.1
• Negative integers: -999, -1001
• Negative bigints: -999n, -1001n
• All format correctly with a minus sign

Special Cases with Options:

• Signed option with zero [test.js:L125]: prettyBytes(0, {signed: true}) returns ' 0 B' (space instead of plus sign for alignment)
• Negative numbers with fixedWidth [test.js:L329]: prettyBytes(-1337, {fixedWidth: 8}) returns '-1.34 kB' (no padding when output exceeds width)
• Very small decimals [test.js:L328]: prettyBytes(0.5, {fixedWidth: 8}) returns ' 0.5 B'

Invalid fixedWidth Values [test.js:L307-L325]:

• Negative: -5 throws error
• Number.POSITIVE_INFINITY throws error
• Number.NaN throws error
• Non-integer floats: 3.5 throws error
• Non-number types: string '10' throws error
• Values exceeding Number.MAX_SAFE_INTEGER throw error

The tests ensure the function rejects invalid inputs but handles legitimate negative numbers and decimal values gracefully.

FOLLOW_UPS:

• How does the signed option change output formatting?
• What's the difference between binary and SI prefix modes?
• How does locale affect number formatting in pretty-bytes?