Split optional-provided field=something and typing.Optional=@nullable field options, add pytest

tests/test_basic.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+from dataclasses import dataclass
+
+from src.megasniff import SchemaInflatorGenerator
+
+
+def test_basic_constructor():
+    class A:
+        def __init__(self, a: int):
+            self.a = a
+
+    infl = SchemaInflatorGenerator()
+    fn = infl.schema_to_generator(A)
+    a = fn({'a': 42})
+
+    assert a.a == 42
+
+
+@dataclass
+class CircA:
+    b: CircB
+
+
+@dataclass
+class CircB:
+    a: CircA | None
+
+
+def test_circular():
+    infl = SchemaInflatorGenerator()
+    fn = infl.schema_to_generator(CircA)
+    a = fn({'b': {'a': None}})
+
+    return isinstance(a.b, CircB)