chore: enable as_tuple test

- Use predicate so we don't need to implement
  DecimalTuple for now

jpyinterpreter/src/main/java/ai/timefold/jpyinterpreter/types/numeric/PythonDecimal.java

@@ -346,7 +346,10 @@ public int hashCode() {
     // Other methods
     // ***************************
     public PythonInteger $method$adjusted() {
-        return PythonInteger.valueOf(getExponent());
+        // scale is the negative exponent that the big int is multiplied by
+        // len(unscaled) - 1 = floor(log_10(unscaled))
+        // floor(log_10(unscaled)) - scale = exponent in engineering notation
+        return PythonInteger.valueOf(value.unscaledValue().toString().length() - 1 - value.scale());
     }
 
     public PythonLikeTuple $method$as_integer_ratio() {
@@ -370,21 +373,14 @@ public int hashCode() {
                 PythonInteger.valueOf(reducedDenominator));
     }
 
-    private int getExponent() {
-        // scale is the negative exponent that the big int is multiplied by
-        // len(unscaled) - 1 = floor(log_10(unscaled))
-        // floor(log_10(unscaled)) - scale = exponent in engineering notation
-        return value.unscaledValue().toString().length() - 1 - value.scale();
-    }
-
     public PythonLikeTuple $method$as_tuple() {
         // TODO: Use named tuple
-        return PythonLikeTuple.fromItems(PythonInteger.valueOf(value.signum()),
-                value.unscaledValue().toString()
+        return PythonLikeTuple.fromItems(PythonInteger.valueOf(value.signum() >= 0 ? 0 : 1),
+                value.unscaledValue().abs().toString()
                         .chars()
                         .mapToObj(digit -> PythonInteger.valueOf(digit - '0'))
                         .collect(Collectors.toCollection(PythonLikeTuple::new)),
-                PythonInteger.valueOf(getExponent()));
+                PythonInteger.valueOf(-value.scale()));
     }
 
     public PythonDecimal $method$canonical() {

jpyinterpreter/tests/test_decimal.py

@@ -301,15 +301,21 @@ def as_integer_ratio(a: Decimal) -> tuple[int, int]:
     adjusted_verifier.verify(Decimal('-3.14'), expected_result=(-157, 50))
 
 
-# TODO: Use named tuples
-# def test_as_tuple():
-#     def as_tuple(a: Decimal) -> tuple[int, int, int]:
-#         return a.as_tuple()
-#
-#     as_tuple_verifier = verifier_for(as_tuple)
-#     as_tuple_verifier.verify(Decimal(100), expected_result=(0, (1, 0, 0), 0))
-#     as_tuple_verifier.verify(Decimal(-100), expected_result=(1, (1, 0, 0), 0))
-#     as_tuple_verifier.verify(Decimal('123.45'), expected_result=(0, (1, 2, 3, 4, 5), -2))
+# TODO: Make as_tuple use NamedTuple
+def test_as_tuple():
+    def as_tuple(a: Decimal) -> tuple[int, tuple[int,...], int]:
+        return a.as_tuple()
+
+    def matches_tuple(t: tuple[int, tuple[int,...], int]) -> Callable[[tuple[int, tuple[int,...], int]], bool]:
+        def predicate(tested: tuple[int, tuple[int,...], int]) -> bool:
+            return t == tested
+
+        return predicate
+
+    as_tuple_verifier = verifier_for(as_tuple)
+    as_tuple_verifier.verify_property(Decimal(100), predicate=matches_tuple((0, (1, 0, 0), 0)))
+    as_tuple_verifier.verify_property(Decimal(-100), predicate=matches_tuple((1, (1, 0, 0), 0)))
+    as_tuple_verifier.verify_property(Decimal('123.45'), predicate=matches_tuple((0, (1, 2, 3, 4, 5), -2)))
 
 
 def test_canonical():