Initial implementation

tests/test_sums.py

@@ -0,0 +1,50 @@
+import pytest
+
+from sums.pairs import PotentialPairs, DiscoveredPairs, NumberPair, find_pairs
+
+PairsTestCase = tuple[PotentialPairs, DiscoveredPairs]
+
+SHORT_TEST: PairsTestCase = (
+    [4, 23, 65, 67, 24, 12, 86],
+    {90: set([NumberPair((4, 86)), NumberPair((23, 67))])},
+)
+
+LONG_TEST: PairsTestCase = (
+    [6, 4, 12, 10, 22, 54, 32, 42, 21, 11],
+    {
+        16: set([NumberPair((4, 12)), NumberPair((6, 10))]),
+        32: set([NumberPair((10, 22)), NumberPair((21, 11))]),
+        33: set([NumberPair((12, 21)), NumberPair((22, 11))]),
+        43: set([NumberPair((22, 21)), NumberPair((32, 11))]),
+        53: set([NumberPair((32, 21)), NumberPair((42, 11))]),
+        54: set([NumberPair((12, 42)), NumberPair((22, 32))]),
+        64: set([NumberPair((10, 54)), NumberPair((22, 42))]),
+    },
+)
+
+HAS_DUPLICATE_SUMS: PairsTestCase = (
+    [33, 33, 32, 34],
+    {
+        66: set([NumberPair((33, 33)), NumberPair((32, 34))]),
+    },
+)
+
+HAS_DUPLICATE_PAIRS: PairsTestCase = (
+    [33, 33, 33],
+    {},
+)
+
+
+@pytest.mark.parametrize(
+    ("numbers", "expected"),
+    [SHORT_TEST, LONG_TEST, HAS_DUPLICATE_SUMS, HAS_DUPLICATE_PAIRS],
+)
+def test_pairs(numbers: PotentialPairs, expected: DiscoveredPairs):
+    discovered = find_pairs(numbers)
+    assert discovered == expected
+
+def test_number_pair_only_equals_self():
+    a = NumberPair((3, 4))
+    b = (3, 4)
+
+    assert not a.__eq__(b)