Test README resources read handler example

Author: sambostock

README.md

@@ -491,6 +491,7 @@ server = MCP::Server.new(
 
 The server must register a handler for the `resources/read` method to retrieve a resource dynamically.
 
+<!-- SNIPPET ID: resources_read_handler -->
 ```ruby
 server.resources_read_handler do |params|
   [{

test/fixtures/files/code_snippet_wrappers/readme/resources_read_handler.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require "mcp"
+
+server = MCP::Server.new
+
+b = binding
+eval(File.read("code_snippet.rb"), b) # rubocop:disable Security/Eval -- We need the snippet to have access to the server variable
+
+puts server.handle_json({
+  jsonrpc: "2.0",
+  id: "1",
+  method: "resources/read",
+  params: { uri: "https://example.com/test_resource" },
+}.to_json)

test/integration/readme_code_snippets_test.rb

@@ -270,6 +270,27 @@ class ReadmeCodeSnippetsTest < ActiveSupport::TestCase
     )
   end
 
+  test "Resources Read Handler example works exactly as documented in README" do
+    assert_json_lines(
+      [
+        {
+          jsonrpc: "2.0",
+          id: "1",
+          result: {
+            contents: [
+              {
+                uri: "https://example.com/test_resource",
+                mimeType: "text/plain",
+                text: "https://example.com/test_resource",
+              },
+            ],
+          },
+        },
+      ],
+      run_code_snippet("resources_read_handler"),
+    )
+  end
+
   private
 
   def assert_json_lines(expected, actual, message = "Expected the given JSON lines")