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, 83 insertions, 0 deletions

diff --git a/src/test/java/testing/protocols/TimeSynchronizationProtocolTest.java b/src/test/java/testing/protocols/TimeSynchronizationProtocolTest.java
new file mode 100644
index 0000000..d04dab3
--- /dev/null
+++ b/src/test/java/testing/protocols/TimeSynchronizationProtocolTest.java
@@ -0,0 +1,83 @@
+package testing.protocols;
+
+import testing.*;
+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * JUnit tests for time synchronization protocols (internal and external).
+ */
+@DisplayName("Time Synchronization Protocol Tests")
+public class TimeSynchronizationProtocolTest {
+    private HeadlessSimulationRunner runner;
+    
+    @BeforeEach
+    public void setup() {
+        runner = new HeadlessSimulationRunner();
+    }
+    
+    @AfterEach
+    public void teardown() {
+        runner.shutdown();
+    }
+    
+    @Test
+    @DisplayName("Test Internal Time Synchronization")
+    public void testInternalTimeSync() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/int-sync.dat", 
+            3000
+        );
+        
+        ProtocolVerifier verifier = new ProtocolVerifier()
+            .expectLog("Internal.*sync.*activated|Internal sync.*activated")
+            .expectLog("time|Time|sync|Sync")
+            .expectLog("Message")
+            .expectNoLog("ERROR");
+            
+        VerificationResult verification = verifier.verify(result.getAllLogs());
+        assertTrue(verification.passed(), verification.getFailureMessage());
+    }
+    
+    @Test
+    @DisplayName("Test External vs Internal Time Synchronization")
+    public void testExternalVsInternalSync() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/ext-vs-int-sync.dat", 
+            4000
+        );
+        
+        // This simulation compares external and internal sync
+        ProtocolVerifier verifier = new ProtocolVerifier()
+            .expectLog("activated")
+            .expectLog("sync|Sync|synchron")
+            .expectNoLog("ERROR")
+            .expectNoLog("failed");
+            
+        VerificationResult verification = verifier.verify(result.getAllLogs());
+        assertTrue(verification.passed(), verification.getFailureMessage());
+        
+        // Check for both internal and external sync activity
+        boolean hasInternal = result.countLogs("Internal|internal") > 0;
+        boolean hasExternal = result.countLogs("External|external|Christians") > 0;
+        
+        assertTrue(hasInternal || hasExternal, 
+                  "Should have time synchronization activity");
+    }
+    
+    @Test
+    @DisplayName("Test clock adjustments")
+    public void testClockAdjustments() throws Exception {
+        SimulationResult result = runner.runSimulation(
+            "saved-simulations/int-sync.dat", 
+            5000
+        );
+        
+        // Look for time-related messages
+        boolean hasTimeMessages = result.countLogs("time|Time|clock|Clock") > 0;
+        boolean hasAdjustments = result.countLogs("adjust|Adjust|sync") > 0;
+        
+        assertTrue(hasTimeMessages || hasAdjustments, 
+                  "Should have time-related activity");
+    }
+}
\ No newline at end of file