Add more thorough test cases

data/test_types.proto

@@ -0,0 +1,53 @@
+syntax = "proto3";
+
+package roto.test;
+
+// A comprehensive message containing all primitive types and complex structures
+// to test the proto-to-rust codegen and runtime accessors.
+message ComplexMessage {
+  // --- Floating Point ---
+  double d_val = 1;
+  float f_val = 2;
+
+  // --- Integers (Variable Length) ---
+  int32 i32_val = 3;
+  int64 i64_val = 4;
+  uint32 u32_val = 5;
+  uint64 u64_val = 6;
+  sint32 si32_val = 7;
+  sint64 si64_val = 8;
+
+  // --- Integers (Fixed Length) ---
+  fixed32 fx32_val = 9;
+  fixed64 fx64_val = 10;
+  sfixed32 sfx32_val = 11;
+  sfixed64 sfx64_val = 12;
+
+  // --- Other Primitives ---
+  bool b_val = 13;
+  string s_val = 14;
+  bytes bytes_val = 15;
+
+  // --- Enumerations ---
+  enum Status {
+    UNKNOWN = 0;
+    ACTIVE = 1;
+    INACTIVE = 2;
+    DELETED = 3;
+  }
+  Status status = 16;
+
+  // --- Repeated Fields ---
+  // Testing packed primitives and non-packed types
+  repeated int32 repeated_i32 = 17;
+  repeated string repeated_string = 18;
+  repeated NestedMessage repeated_nested = 19;
+
+  // --- Nested Messages ---
+  message NestedMessage {
+    int32 id = 1;
+    string name = 2;
+    bool active = 3;
+  }
+  NestedMessage single_nested = 20;
+}