Add the protocol-comparison module

protocol-comparison/src/test/java/com/ankurm/protocols/RSocketDefaultsTest.java

@@ -0,0 +1,38 @@
+package com.ankurm.protocols;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.messaging.rsocket.RSocketStrategies;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * What Boot actually configures for RSocket, printed rather than quoted.
+ *
+ * <p>A bare {@code RSocketStrategies.create()} carries no JSON and no CBOR at all &mdash; only
+ * the string and buffer codecs. Everything interesting comes from Boot's
+ * {@code RSocketStrategiesAutoConfiguration}, which is also where the default data mime type is
+ * decided, and it is not the one most people assume.
+ */
+@SpringBootTest(properties = {"spring.rsocket.server.port=7005", "spring.grpc.server.port=9095"})
+class RSocketDefaultsTest {
+
+    @Autowired
+    RSocketStrategies strategies;
+
+    @Test
+    void bootConfiguredCodecs() {
+        var encoders = strategies.encoders().stream().map(e -> e.getClass().getSimpleName()).toList();
+        var decoders = strategies.decoders().stream().map(d -> d.getClass().getSimpleName()).toList();
+
+        System.out.println("=== Boot-configured RSocketStrategies ===");
+        System.out.println("encoders : " + encoders);
+        System.out.println("decoders : " + decoders);
+        System.out.println("bare RSocketStrategies.create() encoders : "
+                + RSocketStrategies.create().encoders().stream()
+                        .map(e -> e.getClass().getSimpleName()).toList());
+
+        assertThat(encoders).isNotEmpty();
+    }
+}