Better JSON 64-bit int handling, add way to determine whether a message was sent on the wire, various fixes

betterproto/tests/test_features.py

@@ -0,0 +1,32 @@
+import betterproto
+from dataclasses import dataclass
+
+
+def test_has_field():
+    @dataclass
+    class Bar(betterproto.Message):
+        baz: int = betterproto.int32_field(1)
+
+    @dataclass
+    class Foo(betterproto.Message):
+        bar: Bar = betterproto.message_field(1)
+
+    # Unset by default
+    foo = Foo()
+    assert foo.bar.serialized_on_wire == False
+
+    # Serialized after setting something
+    foo.bar.baz = 1
+    assert foo.bar.serialized_on_wire == True
+
+    # Still has it after setting the default value
+    foo.bar.baz = 0
+    assert foo.bar.serialized_on_wire == True
+
+    # Manual override
+    foo.bar.serialized_on_wire = False
+    assert foo.bar.serialized_on_wire == False
+
+    # Can manually set it but defaults to false
+    foo.bar = Bar()
+    assert foo.bar.serialized_on_wire == False