Complete GUI decoupling implementation for headless testing

- Implement MessageHandler pattern to decouple message sending from visualization
- Add HeadlessLoader to load simulations without GUI components
- Create HeadlessProtocolRunner for clean protocol test execution
- Update VSInternalProcess to use MessageHandler for message routing
- Add null checks in VSSimulator for headless mode compatibility
- Update VSSimulatorVisualization paint() to check for headless mode
- Remove obsolete test scripts and documentation
- Update test-protocols.sh to remove GUI error suppression options
- Consolidate testing documentation in docs/testing-guide.md

All protocol tests now run cleanly in headless mode without GUI errors,
enabling proper CI/CD integration and automated testing.

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

Co-Authored-By: Claude <noreply@anthropic.com>

1 files changed, 163 insertions, 0 deletions

diff --git a/src/main/java/testing/SimpleProtocolTestRunner.java b/src/main/java/testing/SimpleProtocolTestRunner.java
new file mode 100644
index 0000000..02a0ed9
--- /dev/null
+++ b/src/main/java/testing/SimpleProtocolTestRunner.java
@@ -0,0 +1,163 @@
+package testing;
+
+import java.io.File;
+import java.util.*;
+
+/**
+ * Simple runner for protocol tests that shows detailed output.
+ */
+public class SimpleProtocolTestRunner {
+    
+    private static final String ANSI_GREEN = "\u001B[32m";
+    private static final String ANSI_RED = "\u001B[31m";
+    private static final String ANSI_YELLOW = "\u001B[33m";
+    private static final String ANSI_BLUE = "\u001B[34m";
+    private static final String ANSI_RESET = "\u001B[0m";
+    
+    public static void main(String[] args) {
+        System.out.println("=== DS-Sim Protocol Test Runner ===\n");
+        
+        // Check if saved simulations exist
+        File savedDir = new File("saved-simulations");
+        if (!savedDir.exists()) {
+            System.err.println("ERROR: saved-simulations directory not found!");
+            System.err.println("Please ensure you're running from the project root directory.");
+            System.exit(1);
+        }
+        
+        // List of all protocol test simulations
+        Map<String, TestInfo> tests = new LinkedHashMap<>();
+        tests.put("Ping-Pong Protocol", new TestInfo("saved-simulations/ping-pong.dat", 5000,
+            Arrays.asList("Ping", "Pong", "message:", "counter")));
+        tests.put("Berkeley Time Protocol", new TestInfo("saved-simulations/berkeley.dat", 5000,
+            Arrays.asList("Time synchronization", "Berkeley", "adjustment")));
+        tests.put("Broadcast Protocol", new TestInfo("saved-simulations/broadcast.dat", 3000,
+            Arrays.asList("broadcast", "received", "message")));
+        tests.put("Basic Multicast Protocol", new TestInfo("saved-simulations/basic-multicast.dat", 3000,
+            Arrays.asList("multicast", "group", "received")));
+        tests.put("Reliable Multicast Protocol", new TestInfo("saved-simulations/reliable-multicast.dat", 5000,
+            Arrays.asList("reliable", "multicast", "ACK", "resend")));
+        tests.put("External Time Sync", new TestInfo("saved-simulations/external-time-sync.dat", 5000,
+            Arrays.asList("external", "time", "sync", "adjustment")));
+        tests.put("Internal Time Sync", new TestInfo("saved-simulations/internal-time-sync.dat", 5000,
+            Arrays.asList("internal", "time", "sync", "average")));
+        tests.put("One-Phase Commit Protocol", new TestInfo("saved-simulations/one-phase-commit.dat", 3000,
+            Arrays.asList("commit", "vote", "decision")));
+        tests.put("Two-Phase Commit Protocol", new TestInfo("saved-simulations/two-phase-commit.dat", 5000,
+            Arrays.asList("prepare", "commit", "vote", "decision")));
+        tests.put("Slow Connection Protocol", new TestInfo("saved-simulations/slow-connection.dat", 8000,
+            Arrays.asList("slow", "connection", "delay")));
+        tests.put("Ping-Pong Sturm Protocol", new TestInfo("saved-simulations/ping-pong-sturm.dat", 5000,
+            Arrays.asList("Sturm", "ping", "pong")));
+        
+        int passed = 0;
+        int failed = 0;
+        int skipped = 0;
+        
+        // Create headless runner with logs enabled
+        HeadlessSimulationRunner runner = new HeadlessSimulationRunner();
+        runner.setPrintLogs(true);
+        
+        // Run each test
+        for (Map.Entry<String, TestInfo> entry : tests.entrySet()) {
+            String testName = entry.getKey();
+            TestInfo info = entry.getValue();
+            
+            System.out.println("\n" + ANSI_YELLOW + "Testing: " + testName + ANSI_RESET);
+            System.out.println("Simulation file: " + info.simulationFile);
+            System.out.println("Duration: " + info.duration + "ms");
+            System.out.println("Expected patterns: " + info.expectedPatterns);
+            
+            // Check if simulation file exists
+            File simFile = new File(info.simulationFile);
+            if (!simFile.exists()) {
+                System.out.println(ANSI_RED + "✗ SKIPPED - Simulation file not found" + ANSI_RESET);
+                skipped++;
+                continue;
+            }
+            
+            try {
+                // Add log listener to capture output
+                final List<String> capturedLogs = new ArrayList<>();
+                LogListener listener = new LogListener() {
+                    @Override
+                    public void onLogEntry(LogEntry entry) {
+                        String log = entry.getMessage();
+                        capturedLogs.add(log);
+                        // Print interesting logs in blue
+                        for (String pattern : info.expectedPatterns) {
+                            if (log.toLowerCase().contains(pattern.toLowerCase())) {
+                                System.out.println(ANSI_BLUE + "  [LOG] " + log + ANSI_RESET);
+                                break;
+                            }
+                        }
+                    }
+                };
+                
+                System.out.println("\nRunning simulation...");
+                SimulationResult result = runner.runSimulation(info.simulationFile, info.duration, listener);
+                
+                // Verify expected patterns
+                System.out.println("\nVerifying patterns:");
+                boolean allPatternsFound = true;
+                for (String pattern : info.expectedPatterns) {
+                    boolean found = capturedLogs.stream()
+                        .anyMatch(log -> log.toLowerCase().contains(pattern.toLowerCase()));
+                    if (found) {
+                        System.out.println(ANSI_GREEN + "  ✓ Found: " + pattern + ANSI_RESET);
+                    } else {
+                        System.out.println(ANSI_RED + "  ✗ Missing: " + pattern + ANSI_RESET);
+                        allPatternsFound = false;
+                    }
+                }
+                
+                // Check result
+                System.out.println("\nResult summary:");
+                System.out.println("  Total logs captured: " + result.getAllLogs().size());
+                System.out.println("  Processes: " + result.getMetrics().getNumProcesses());
+                System.out.println("  Message counts: " + result.getMetrics().getProcessMessageCounts());
+                
+                if (allPatternsFound && result.getAllLogs().size() > 0) {
+                    System.out.println(ANSI_GREEN + "✓ PASSED" + ANSI_RESET);
+                    passed++;
+                } else {
+                    System.out.println(ANSI_RED + "✗ FAILED - Not all patterns found or no logs captured" + ANSI_RESET);
+                    failed++;
+                }
+                
+            } catch (Exception e) {
+                System.out.println(ANSI_RED + "✗ FAILED: " + e.getMessage() + ANSI_RESET);
+                e.printStackTrace();
+                failed++;
+            }
+        }
+        
+        // Cleanup
+        runner.shutdown();
+        
+        // Print summary
+        System.out.println("\n" + "=".repeat(50));
+        System.out.println("Test Summary:");
+        System.out.println(ANSI_GREEN + "  Passed: " + passed + ANSI_RESET);
+        System.out.println(ANSI_RED + "  Failed: " + failed + ANSI_RESET);
+        System.out.println(ANSI_YELLOW + "  Skipped: " + skipped + ANSI_RESET);
+        System.out.println("  Total: " + tests.size());
+        System.out.println("=".repeat(50));
+        
+        // Exit with appropriate code
+        System.exit(failed > 0 ? 1 : 0);
+    }
+    
+    // Helper class to store test information
+    static class TestInfo {
+        final String simulationFile;
+        final long duration;
+        final List<String> expectedPatterns;
+        
+        TestInfo(String simulationFile, long duration, List<String> expectedPatterns) {
+            this.simulationFile = simulationFile;
+            this.duration = duration;
+            this.expectedPatterns = expectedPatterns;
+        }
+    }
+}
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