From d3b697218773eaa5a3dd368705184726dbc0fa38 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sat, 21 Jun 2025 15:54:07 +0300
Subject: Implement headless testing framework for DS-Sim protocol simulations
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- Created HeadlessSimulationRunner that loads and runs simulations without GUI
- Implemented LogCapture to intercept and store all simulation logs
- Added ProtocolVerifier for flexible pattern-based log verification
- Created test runners: standard, with logs, and clean (filters GUI errors)
- Implemented tests for all non-Raft protocols
- Added DummySimulatorFrame to satisfy GUI dependencies during loading
- Created CleanHeadlessRunner that filters GUI-related errors from output
- Updated run-tests.sh script with quiet mode option
- Documented the framework architecture and usage

The framework successfully runs protocol tests and verifies behavior through
log analysis. GUI errors occur internally due to tight coupling in DS-Sim
but are filtered in quiet mode for clean output.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 .../protocols/ReliableMulticastProtocolTest.java   | 86 ++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/test/java/testing/protocols/ReliableMulticastProtocolTest.java

(limited to 'src/test/java/testing/protocols/ReliableMulticastProtocolTest.java')

diff --git a/src/test/java/testing/protocols/ReliableMulticastProtocolTest.java b/src/test/java/testing/protocols/ReliableMulticastProtocolTest.java
new file mode 100644
index 0000000..ae9b4d7
--- /dev/null
+++ b/src/test/java/testing/protocols/ReliableMulticastProtocolTest.java
@@ -0,0 +1,86 @@
+package testing.protocols;
+
+import testing.*;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * JUnit test for Reliable Multicast protocol.
+ */
+@DisplayName("Reliable Multicast Protocol Tests")
+public class ReliableMulticastProtocolTest {
+    private HeadlessSimulationRunner runner;
+    
+    @BeforeEach
+    public void setup() {
+        runner = new HeadlessSimulationRunner();
+    }
+    
+    @AfterEach
+    public void teardown() {
+        runner.shutdown();
+    }
+    
+    @Test
+    @DisplayName("Test Reliable Multicast protocol activation")
+    public void testProtocolActivation() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/reliable-multicast.dat", 
+            1000
+        );
+        
+        ProtocolVerifier verifier = new ProtocolVerifier()
+            .expectLog("Reliable Multicast.*activated")
+            .expectNoLog("ERROR");
+            
+        VerificationResult verification = verifier.verify(result.getAllLogs());
+        assertTrue(verification.passed(), verification.getFailureMessage());
+    }
+    
+    @Test
+    @DisplayName("Test reliable delivery guarantees")
+    public void testReliableDelivery() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/reliable-multicast.dat", 
+            5000
+        );
+        
+        // Reliable multicast should ensure delivery
+        ProtocolVerifier verifier = new ProtocolVerifier()
+            .expectLog("Message sent")
+            .expectLog("Message received")
+            .expectLog("Multicast|multicast")
+            .expectNoLog("lost|Lost|LOST")
+            .expectNoLog("failed delivery");
+            
+        VerificationResult verification = verifier.verify(result.getAllLogs());
+        assertTrue(verification.passed(), verification.getFailureMessage());
+        
+        // Check for acknowledgments or reliability mechanisms
+        boolean hasAck = result.countLogs("ack|ACK|acknowledge|Acknowledge") > 0;
+        boolean hasSeq = result.countLogs("sequence|Sequence|seq|SEQ") > 0;
+        boolean hasReliable = result.countLogs("reliable|Reliable") > 0;
+        
+        assertTrue(hasAck || hasSeq || hasReliable, 
+                  "Should have reliability mechanisms");
+    }
+    
+    @Test
+    @DisplayName("Test message ordering in reliable multicast")
+    public void testMessageOrdering() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/reliable-multicast.dat", 
+            3000
+        );
+        
+        // Verify messages maintain order
+        var messages = result.findAll("Message received");
+        
+        long lastTime = -1;
+        for (LogEntry entry : messages) {
+            assertTrue(entry.getTimestamp() >= lastTime, 
+                      "Messages should be in order");
+            lastTime = entry.getTimestamp();
+        }
+    }
+}
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