Move betterproto/tests → tests

tests/inputs/casing/casing.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+enum my_enum {
+  ZERO = 0;
+  ONE = 1;
+  TWO = 2;
+}
+
+message Test {
+  int32 camelCase = 1;
+  my_enum snake_case = 2;
+  snake_case_message snake_case_message = 3;
+  int32 UPPERCASE = 4;
+}
+
+message snake_case_message {
+
+}