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>
---
 src/main/java/testing/QuietProtocolTestRunner.java | 79 ++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/main/java/testing/QuietProtocolTestRunner.java

(limited to 'src/main/java/testing/QuietProtocolTestRunner.java')

diff --git a/src/main/java/testing/QuietProtocolTestRunner.java b/src/main/java/testing/QuietProtocolTestRunner.java
new file mode 100644
index 0000000..d3b35a1
--- /dev/null
+++ b/src/main/java/testing/QuietProtocolTestRunner.java
@@ -0,0 +1,79 @@
+package testing;
+
+import java.io.PrintStream;
+import java.io.OutputStream;
+
+/**
+ * A test runner that suppresses GUI-related error messages while still showing test results.
+ * This provides a cleaner output when running headless tests.
+ */
+public class QuietProtocolTestRunner {
+    
+    public static void main(String[] args) {
+        // Create a custom PrintStream that filters out specific error messages
+        PrintStream originalErr = System.err;
+        PrintStream filteredErr = new PrintStream(new FilteredOutputStream(originalErr));
+        
+        try {
+            // Redirect System.err to our filtered stream
+            System.setErr(filteredErr);
+            
+            // Run the actual test runner
+            System.out.println("=== DS-Sim Protocol Test Runner (Quiet Mode) ===\n");
+            System.out.println("Note: GUI errors are suppressed for cleaner output.\n");
+            
+            // Pass through any arguments (like -v for verbose)
+            ProtocolTestRunnerWithLogs.main(args);
+            
+        } finally {
+            // Restore original error stream
+            System.setErr(originalErr);
+        }
+    }
+    
+    /**
+     * An OutputStream that filters out specific error messages.
+     */
+    private static class FilteredOutputStream extends OutputStream {
+        private final PrintStream target;
+        private final StringBuilder buffer = new StringBuilder();
+        
+        public FilteredOutputStream(PrintStream target) {
+            this.target = target;
+        }
+        
+        @Override
+        public void write(int b) {
+            buffer.append((char) b);
+            
+            // Check if we have a complete line
+            if (b == '\n') {
+                String line = buffer.toString();
+                
+                // Filter out specific GUI-related errors
+                if (!line.contains("Component must have a valid peer") &&
+                    !line.contains("java.lang.IllegalStateException") &&
+                    !line.contains("at java.desktop/") &&
+                    !line.contains("at simulator.VSSimulatorVisualization.paint") &&
+                    !line.contains("createBufferStrategy") &&
+                    !line.contains("FlipBufferStrategy")) {
+                    
+                    // Pass through other messages
+                    target.print(line);
+                }
+                
+                buffer.setLength(0);
+            }
+        }
+        
+        @Override
+        public void flush() {
+            target.flush();
+        }
+        
+        @Override
+        public void close() {
+            target.close();
+        }
+    }
+}
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