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

Question

RepoPilot · Accepted Answer

The test suite covers several edge cases related to invalid inputs and special numeric values:

**Invalid inputs that throw:**
- Empty strings and non-numeric strings [test.js:L4-L9]
- `Number.NaN` [test.js:L11-L13]
- Booleans (`true`) [test.js:L15-L17]
- `Number.POSITIVE_INFINITY` and `Number.NEGATIVE_INFINITY` [test.js:L19-L26]
- `null` [test.js:L28-L30]

**Invalid `fixedWidth` values that throw:**
- Negative `fixedWidth` (e.g., `-1`, `-5`) [test.js:L32-L34 and L316-L319]
- Non-integer `fixedWidth` (e.g., `1.5`, `3.5`) [test.js:L36-L38 and L327-L329]
- `Number.POSITIVE_INFINITY` for `fixedWidth` [test.js:L321-L324]
- `Number.NaN` for `fixedWidth` [test.js:L325-L328]
- Non-number types like strings for `fixedWidth` [test.js:L330-L333]

**Negative numbers (valid):**
The function supports negative inputs: `prettyBytes(-0.4)` returns `'-0.4 B'`, `prettyBytes(-999)` returns `'-999 B'`, and `prettyBytes(-1001)` returns `'-1 kB'` [test.js:L55-L61].

**Zero and near-zero:**
The function handles `0`, `0.4`, `0.7` correctly [test.js:L47-L50], and also has special handling for signed zero with padding [test.js:L280].

FOLLOW_UPS:
- How does the signed option affect output formatting?
- What locales are supported by the library?
- How are precision and rounding determined?