Add more thorough test cases

data/test_data.textproto

@@ -0,0 +1,39 @@
+d_val: 3.1415926535
+f_val: 2.71828
+i32_val: 42
+i64_val: 123456789012345
+u32_val: 1000
+u64_val: 18446744073709551615
+si32_val: -42
+si64_val: -123456789012345
+fx32_val: 123456
+fx64_val: 1234567890123456789
+sfx32_val: -123456
+sfx64_val: -1234567890123456789
+b_val: true
+s_val: "Hello Roto!"
+bytes_val: "SGVsbG8gUm90byE="
+status: ACTIVE
+repeated_i32: 1
+repeated_i32: 2
+repeated_i32: 3
+repeated_i32: 4
+repeated_i32: 5
+repeated_string: "one"
+repeated_string: "two"
+repeated_string: "three"
+repeated_nested {
+  id: 101
+  name: "Nested 1"
+  active: true
+}
+repeated_nested {
+  id: 102
+  name: "Nested 2"
+  active: false
+}
+single_nested {
+  id: 200
+  name: "Single Nested"
+  active: true
+}

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;
+}