Adding upstream version 1.2+20240521.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/inputs/oneof/oneof-name.json

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+{
+  "pitier": "Mr. T"
+}

tests/inputs/oneof/oneof.json

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+{
+  "pitied": 100
+}

tests/inputs/oneof/oneof.proto

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+syntax = "proto3";
+
+package oneof;
+
+message MixedDrink {
+  int32 shots = 1;
+}
+
+message Test {
+  oneof foo {
+    int32 pitied = 1;
+    string pitier = 2;
+  }
+
+  int32 just_a_regular_field = 3;
+
+  oneof bar {
+    int32 drinks = 11;
+    string bar_name = 12;
+    MixedDrink mixed_drink = 13;
+  }
+}
+

tests/inputs/oneof/oneof_name.json

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+{
+  "pitier": "Mr. T"
+}

tests/inputs/oneof/test_oneof.py

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+import pytest
+
+import aristaproto
+from tests.output_aristaproto.oneof import (
+    MixedDrink,
+    Test,
+)
+from tests.output_aristaproto_pydantic.oneof import Test as TestPyd
+from tests.util import get_test_case_json_data
+
+
+def test_which_count():
+    message = Test()
+    message.from_json(get_test_case_json_data("oneof")[0].json)
+    assert aristaproto.which_one_of(message, "foo") == ("pitied", 100)
+
+
+def test_which_name():
+    message = Test()
+    message.from_json(get_test_case_json_data("oneof", "oneof_name.json")[0].json)
+    assert aristaproto.which_one_of(message, "foo") == ("pitier", "Mr. T")
+
+
+def test_which_count_pyd():
+    message = TestPyd(pitier="Mr. T", just_a_regular_field=2, bar_name="a_bar")
+    assert aristaproto.which_one_of(message, "foo") == ("pitier", "Mr. T")
+
+
+def test_oneof_constructor_assign():
+    message = Test(mixed_drink=MixedDrink(shots=42))
+    field, value = aristaproto.which_one_of(message, "bar")
+    assert field == "mixed_drink"
+    assert value.shots == 42
+
+
+# Issue #305:
+@pytest.mark.xfail
+def test_oneof_nested_assign():
+    message = Test()
+    message.mixed_drink.shots = 42
+    field, value = aristaproto.which_one_of(message, "bar")
+    assert field == "mixed_drink"
+    assert value.shots == 42