Test that uid 0 isn't dropped in proto to text conversion.

Bug: http://b/401182697
Change-Id: I0bbb11d1babfcf19a98cacb14f16487006182e0b
diff --git a/debuggerd/libdebuggerd/test/tombstone_proto_to_text_test.cpp b/debuggerd/libdebuggerd/test/tombstone_proto_to_text_test.cpp
index aad209a..988ca0c 100644
--- a/debuggerd/libdebuggerd/test/tombstone_proto_to_text_test.cpp
+++ b/debuggerd/libdebuggerd/test/tombstone_proto_to_text_test.cpp
@@ -175,3 +175,8 @@
   ProtoToString();
   EXPECT_MATCH(text_, "\\(BuildId: 0123456789abcdef\\)\\nSYMBOLIZE 0123456789abcdef 12345\\n");
 }
+
+TEST_F(TombstoneProtoToTextTest, uid) {
+  ProtoToString();
+  EXPECT_MATCH(text_, "\\nLOG uid: 0\\n");
+}