Implement headless testing framework for DS-Sim protocol simulations

- 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>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/test/java/testing/protocols/PingPongSturmProtocolTest.java b/src/test/java/testing/protocols/PingPongSturmProtocolTest.java
new file mode 100644
index 0000000..34cf64e
--- /dev/null
+++ b/src/test/java/testing/protocols/PingPongSturmProtocolTest.java
@@ -0,0 +1,64 @@
+package testing.protocols;
+
+import testing.*;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * JUnit test for Ping-Pong Sturm variant.
+ */
+@DisplayName("Ping-Pong Sturm Protocol Tests")
+public class PingPongSturmProtocolTest {
+    private HeadlessSimulationRunner runner;
+    
+    @BeforeEach
+    public void setup() {
+        runner = new HeadlessSimulationRunner();
+    }
+    
+    @AfterEach
+    public void teardown() {
+        runner.shutdown();
+    }
+    
+    @Test
+    @DisplayName("Test Ping-Pong Sturm protocol activation")
+    public void testProtocolActivation() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/ping-pong-sturm.dat", 
+            1000
+        );
+        
+        ProtocolVerifier verifier = new ProtocolVerifier()
+            .expectLog("Ping-Pong.*activated")
+            .expectNoLog("ERROR");
+            
+        VerificationResult verification = verifier.verify(result.getAllLogs());
+        assertTrue(verification.passed(), verification.getFailureMessage());
+    }
+    
+    @Test
+    @DisplayName("Test Sturm variant message exchange")
+    public void testSturmMessageExchange() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/ping-pong-sturm.dat", 
+            3000
+        );
+        
+        // Similar to regular ping-pong but may have different patterns
+        ProtocolVerifier verifier = new ProtocolVerifier()
+            .expectLog("Message sent")
+            .expectLog("Message received")
+            .expectLog("fromClient=true|fromServer=true");
+            
+        VerificationResult verification = verifier.verify(result.getAllLogs());
+        assertTrue(verification.passed(), verification.getFailureMessage());
+        
+        // Check for balanced communication
+        int sent = result.countLogs("Message sent");
+        int received = result.countLogs("Message received");
+        
+        assertTrue(Math.abs(sent - received) <= 2, 
+                  "Messages should be roughly balanced");
+    }
+}
\ No newline at end of file