Improved test coverage in decimal_to_fraction.py (TheAlgorithms#12608)

* Imporved test coverage in  decimal_to_fraction.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update decimal_to_fraction.py

* Update decimal_to_fraction.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Maxim Smolskiy <[email protected]>

Author: 3 people

Diff for: maths/decimal_to_fraction.py

@@ -16,6 +16,20 @@ def decimal_to_fraction(decimal: float | str) -> tuple[int, int]:
     >>> decimal_to_fraction("78td")
     Traceback (most recent call last):
     ValueError: Please enter a valid number
+    >>> decimal_to_fraction(0)
+    (0, 1)
+    >>> decimal_to_fraction(-2.5)
+    (-5, 2)
+    >>> decimal_to_fraction(0.125)
+    (1, 8)
+    >>> decimal_to_fraction(1000000.25)
+    (4000001, 4)
+    >>> decimal_to_fraction(1.3333)
+    (13333, 10000)
+    >>> decimal_to_fraction("1.23e2")
+    (123, 1)
+    >>> decimal_to_fraction("0.500")
+    (1, 2)
     """
     try:
         decimal = float(decimal)