mcp: consolidate tests and cleanup imports

src/mcp/protocol.zig

@@ -95,3 +95,70 @@ pub const Resource = struct {
     description: ?[]const u8 = null,
     mimeType: ?[]const u8 = null,
 };
+
+const testing = @import("../testing.zig");
+
+test "protocol request parsing" {
+    const raw_json =
+        \\{
+        \\  "jsonrpc": "2.0",
+        \\  "id": 1,
+        \\  "method": "initialize",
+        \\  "params": {
+        \\    "protocolVersion": "2024-11-05",
+        \\    "capabilities": {},
+        \\    "clientInfo": {
+        \\      "name": "test-client",
+        \\      "version": "1.0.0"
+        \\    }
+        \\  }
+        \\}
+    ;
+
+    const parsed = try std.json.parseFromSlice(Request, testing.allocator, raw_json, .{ .ignore_unknown_fields = true });
+    defer parsed.deinit();
+
+    const req = parsed.value;
+    try testing.expectString("2.0", req.jsonrpc);
+    try testing.expectString("initialize", req.method);
+    try testing.expect(req.id.? == .integer);
+    try testing.expectEqual(@as(i64, 1), req.id.?.integer);
+    try testing.expect(req.params != null);
+
+    // Test nested parsing of InitializeParams
+    const init_params = try std.json.parseFromValue(InitializeParams, testing.allocator, req.params.?, .{ .ignore_unknown_fields = true });
+    defer init_params.deinit();
+
+    try testing.expectString("2024-11-05", init_params.value.protocolVersion);
+    try testing.expectString("test-client", init_params.value.clientInfo.name);
+    try testing.expectString("1.0.0", init_params.value.clientInfo.version);
+}
+
+test "protocol response formatting" {
+    const response = Response{
+        .id = .{ .integer = 42 },
+        .result = .{ .string = "success" },
+    };
+
+    var aw: std.Io.Writer.Allocating = .init(testing.allocator);
+    defer aw.deinit();
+    try std.json.Stringify.value(response, .{ .emit_null_optional_fields = false }, &aw.writer);
+
+    try testing.expectString("{\"jsonrpc\":\"2.0\",\"id\":42,\"result\":\"success\"}", aw.written());
+}
+
+test "protocol error formatting" {
+    const response = Response{
+        .id = .{ .string = "abc" },
+        .@"error" = .{
+            .code = -32601,
+            .message = "Method not found",
+        },
+    };
+
+    var aw: std.Io.Writer.Allocating = .init(testing.allocator);
+    defer aw.deinit();
+    try std.json.Stringify.value(response, .{ .emit_null_optional_fields = false }, &aw.writer);
+
+    try testing.expectString("{\"jsonrpc\":\"2.0\",\"id\":\"abc\",\"error\":{\"code\":-32601,\"message\":\"Method not found\"}}", aw.written());
+}