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, 0 insertions, 88 deletions

diff --git a/docs/testing-framework-usage.md b/docs/testing-framework-usage.md
deleted file mode 100644
index 9ea907d..0000000
--- a/docs/testing-framework-usage.md
+++ /dev/null
@@ -1,88 +0,0 @@
-# DS-Sim Testing Framework Usage
-
-## Overview
-
-The DS-Sim testing framework provides headless testing capabilities for protocol simulations without requiring GUI components.
-
-## Quick Start
-
-Run all protocol tests:
-```bash
-./run-tests.sh
-```
-
-## Test Runners
-
-### 1. Standard Test Runner (with logs)
-Shows test results with protocol logs:
-```bash
-java -cp target/classes testing.ProtocolTestRunnerWithLogs
-```
-
-### 2. Quiet Test Runner
-Filters out GUI-related errors for cleaner output:
-```bash
-java -cp target/classes testing.QuietProtocolTestRunner
-# or
-./run-tests.sh -q
-```
-
-### 3. Verbose Test Runner
-Shows detailed logs for debugging:
-```bash
-java -cp target/classes testing.ProtocolTestRunner -v
-# or
-./run-tests.sh -v
-```
-
-## Running Specific Tests
-
-To run tests programmatically:
-```java
-HeadlessSimulationRunner runner = new HeadlessSimulationRunner();
-runner.setPrintLogs(true); // Enable log output
-
-SimulationResult result = runner.runSimulation(
-    "saved-simulations/ping-pong.dat", 
-    2000  // Duration in ms
-);
-
-// Verify results
-ProtocolVerifier verifier = new ProtocolVerifier()
-    .expectLog("Ping-Pong.*activated")
-    .expectLog("Message sent")
-    .expectNoLog("ERROR");
-
-VerificationResult verification = verifier.verify(result.getAllLogs());
-System.out.println("Test passed: " + verification.passed());
-```
-
-## Test Coverage
-
-The framework tests all non-Raft protocols:
-- Ping-Pong
-- Ping-Pong Sturm
-- Broadcast
-- Basic Multicast
-- Reliable Multicast
-- Berkeley Time Sync
-- Internal Time Sync
-- External vs Internal Sync
-- One-Phase Commit
-- Two-Phase Commit
-- Slow Connection
-
-## Known Limitations
-
-- Some GUI-related errors may appear due to DS-Sim's tight coupling with visual components
-- These errors don't affect test functionality
-- Use quiet mode (`-q`) to filter them out
-
-## Maven Integration
-
-Run tests as part of the build:
-```bash
-mvn test
-```
-
-Note: Ensure Maven Surefire plugin is properly configured to discover test classes.
\ No newline at end of file