fractional: stop printing two minus signs for a negative mixed number

int() truncates toward zero, so int(-1.3) is -1 and (-1.3) - (-1) is
-0.3, which Fraction turns into -3/10. Both the whole-number part and
the numerator end up signed and the output reads as "-1 -3/10".
The minus sign already rides on the whole-number part; absorb it
from the numerator so the result is the conventional "-1 3/10".

Added a few negative cases to test_fractional.

Signed-off-by: Charlie Tonneslan <cst0520@gmail.com>

Author: c-tonneslan

src/humanize/number.py

@@ -367,7 +367,12 @@ def fractional(value: NumberOrString) -> str:
     if not whole_number:
         return f"{numerator:.0f}/{denominator:.0f}"
 
-    return f"{whole_number:.0f} {numerator:.0f}/{denominator:.0f}"
+    # int() truncates toward zero, so for a negative number both
+    # whole_number and numerator carry the minus sign, which prints as
+    # "-1 -3/10". The sign already rides on the whole part; absorb it
+    # from the fractional part so the result reads as a normal mixed
+    # fraction.
+    return f"{whole_number:.0f} {abs(numerator):.0f}/{denominator:.0f}"
 
 
 def scientific(value: NumberOrString, precision: int = 2) -> str:

tests/test_number.py

@@ -183,6 +183,9 @@ def test_apnumber(test_input: int | str, expected: str) -> None:
         (-math.inf, "-Inf"),
         ("nan", "NaN"),
         ("-inf", "-Inf"),
+        (-1.3, "-1 3/10"),
+        (-2.5, "-2 1/2"),
+        (-0.5, "-1/2"),
     ],
 )
 def test_fractional(test_input: float | str, expected: str) -> None: