1.11.0

changelog.md

@@ -1,5 +1,29 @@
 # Changelog
 
+## 2025-05-24 - 1.11.0 - feat(cli)
+Add new timeout and file range options with enhanced logfile diff logging
+
+- Introduce --timeout <seconds> option to safeguard tests from running too long
+- Add --startFrom and --stopAt options to control the range of test files executed
+- Enhance logfile organization by automatically moving previous logs and generating diff reports for failed or changed test outputs
+- Update CLI argument parsing and internal timeout handling for both Node.js and browser tests
+
+## 2025-05-24 - 1.10.2 - fix(tstest-logging)
+Improve log file handling with log rotation and diff reporting
+
+- Add .claude/settings.local.json to configure allowed shell and web operations
+- Introduce movePreviousLogFiles function to archive previous log files when --logfile is used
+- Enhance logging to generate error copies and diff reports between current and previous logs
+- Add type annotations for console overrides in browser evaluations for improved stability
+
+## 2025-05-23 - 1.10.1 - fix(tstest)
+Improve file range filtering and summary logging by skipping test files outside the specified range and reporting them in the final summary.
+
+- Introduce runSingleTestOrSkip to check file index against startFrom/stopAt values.
+- Log skipped files with appropriate messages and add them to the summary.
+- Update the logger to include total skipped files in the test summary.
+- Add permission settings in .claude/settings.local.json to support new operations.
+
 ## 2025-05-23 - 1.10.0 - feat(cli)
 Add --startFrom and --stopAt options to filter test files by range
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@git.zone/tstest",
-  "version": "1.10.0",
+  "version": "1.11.0",
   "private": false,
   "description": "a test utility to run tests that match test/**/*.ts",
   "exports": {

readme.md

@@ -68,8 +68,11 @@ tstest "test/unit/*.ts"
 | `--verbose`, `-v` | Show all console output from tests |
 | `--no-color` | Disable colored output |
 | `--json` | Output results as JSON |
-| `--logfile` | Save detailed logs to `.nogit/testlogs/[testname].log` |
+| `--logfile` | Save detailed logs with automatic error and diff tracking |
 | `--tags <tags>` | Run only tests with specific tags (comma-separated) |
+| `--timeout <seconds>` | Timeout test files after specified seconds |
+| `--startFrom <n>` | Start running from test file number n |
+| `--stopAt <n>` | Stop running at test file number n |
 
 ### Example Outputs
 
@@ -571,14 +574,88 @@ tstest "test/**/*.spec.ts" "test/**/*.test.ts"
 
 **Important**: Always quote glob patterns to prevent shell expansion. Without quotes, the shell will expand the pattern and only pass the first matching file to tstest.
 
-### Automatic Logging
+### Enhanced Test Logging
+
+The `--logfile` option provides intelligent test logging with automatic organization:
 
-Use `--logfile` to automatically save test output:
 ```bash
 tstest test/ --logfile
 ```
 
-This creates detailed logs in `.nogit/testlogs/[testname].log` for each test file.
+**Log Organization:**
+- **Current Run**: `.nogit/testlogs/[testname].log`
+- **Previous Run**: `.nogit/testlogs/previous/[testname].log`
+- **Failed Tests**: `.nogit/testlogs/00err/[testname].log`
+- **Changed Output**: `.nogit/testlogs/00diff/[testname].log`
+
+**Features:**
+- Previous logs are automatically moved to the `previous/` folder
+- Failed tests create copies in `00err/` for quick identification
+- Tests with changed output create diff reports in `00diff/`
+- The `00err/` and `00diff/` folders are cleared on each run
+
+**Example Diff Report:**
+```
+DIFF REPORT: test__api__integration.log
+Generated: 2025-05-24T01:29:13.847Z
+================================================================================
+
+- [Line 8]    ✅ api test passes (150ms)
++ [Line 8]    ✅ api test passes (165ms)
+
+================================================================================
+Previous version had 40 lines
+Current version has 40 lines
+```
+
+### Test Timeout Protection
+
+Prevent runaway tests with the `--timeout` option:
+
+```bash
+# Timeout any test file that runs longer than 60 seconds
+tstest test/ --timeout 60
+
+# Shorter timeout for unit tests
+tstest test/unit/ --timeout 10
+```
+
+When a test exceeds the timeout:
+- The test process is terminated (SIGTERM)
+- The test is marked as failed
+- An error log is created in `.nogit/testlogs/00err/`
+- Clear error message shows the timeout duration
+
+### Test File Range Control
+
+Run specific ranges of test files using `--startFrom` and `--stopAt`:
+
+```bash
+# Run tests starting from the 5th file
+tstest test/ --startFrom 5
+
+# Run only files 5 through 10
+tstest test/ --startFrom 5 --stopAt 10
+
+# Run only the first 3 test files
+tstest test/ --stopAt 3
+```
+
+This is particularly useful for:
+- Debugging specific test failures in large test suites
+- Running tests in chunks on different CI runners
+- Quickly testing changes to specific test files
+
+The output shows which files are skipped:
+```
+⏭️  test/auth.test.ts (1/10)
+   Skipped: before start range (5)
+⏭️  test/user.test.ts (2/10)
+   Skipped: before start range (5)
+▶️  test/api.test.ts (5/10)
+   Runtime: node.js
+   ✅ api endpoints work (145ms)
+```
 
 ### Performance Analysis
 
@@ -620,8 +697,51 @@ tstest test/ --json > test-results.json
 tstest test/ --quiet
 ```
 
+**Advanced CI Example:**
+```bash
+# Run tests with comprehensive logging and safety features
+tstest test/ \
+  --timeout 300 \
+  --logfile \
+  --json > test-results.json
+
+# Run specific test chunks in parallel CI jobs
+tstest test/ --startFrom 1 --stopAt 10   # Job 1
+tstest test/ --startFrom 11 --stopAt 20  # Job 2
+tstest test/ --startFrom 21              # Job 3
+```
+
+### Debugging Failed Tests
+
+When tests fail, use the enhanced logging features:
+
+```bash
+# Run with logging to capture detailed output
+tstest test/ --logfile --verbose
+
+# Check error logs
+ls .nogit/testlogs/00err/
+
+# Review diffs for flaky tests
+cat .nogit/testlogs/00diff/test__api__endpoints.log
+
+# Re-run specific failed tests
+tstest test/api/endpoints.test.ts --verbose --timeout 60
+```
+
 ## Changelog
 
+### Version 1.10.0
+- ⏱️ Added `--timeout <seconds>` option for test file timeout protection
+- 🎯 Added `--startFrom <n>` and `--stopAt <n>` options for test file range control
+- 📁 Enhanced `--logfile` with intelligent log organization:
+  - Previous logs moved to `previous/` folder
+  - Failed tests copied to `00err/` folder
+  - Changed tests create diff reports in `00diff/` folder
+- 🔍 Improved test discovery to show skipped files with clear reasons
+- 🐛 Fixed TypeScript compilation warnings and unused variables
+- 📊 Test summaries now include skipped file counts
+
 ### Version 1.9.2
 - 🐛 Fixed test timing display issue (removed duplicate timing in output)
 - 📝 Improved internal protocol design documentation

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tstest',
-  version: '1.10.0',
+  version: '1.11.0',
   description: 'a test utility to run tests that match test/**/*.ts'
 }

ts/index.ts

@@ -15,6 +15,7 @@ export const runCli = async () => {
   let tags: string[] = [];
   let startFromFile: number | null = null;
   let stopAtFile: number | null = null;
+  let timeoutSeconds: number | null = null;
   
   // Parse options
   for (let i = 0; i < args.length; i++) {
@@ -70,6 +71,19 @@ export const runCli = async () => {
           process.exit(1);
         }
         break;
+      case '--timeout':
+        if (i + 1 < args.length) {
+          const value = parseInt(args[++i], 10);
+          if (isNaN(value) || value < 1) {
+            console.error('Error: --timeout must be a positive integer (seconds)');
+            process.exit(1);
+          }
+          timeoutSeconds = value;
+        } else {
+          console.error('Error: --timeout requires a number argument (seconds)');
+          process.exit(1);
+        }
+        break;
       default:
         if (!arg.startsWith('-')) {
           testPath = arg;
@@ -95,6 +109,7 @@ export const runCli = async () => {
     console.error('  --tags <tags>     Run only tests with specified tags (comma-separated)');
     console.error('  --startFrom <n>   Start running from test file number n');
     console.error('  --stopAt <n>      Stop running at test file number n');
+    console.error('  --timeout <s>     Timeout test files after s seconds');
     process.exit(1);
   }
   
@@ -109,7 +124,7 @@ export const runCli = async () => {
     executionMode = TestExecutionMode.DIRECTORY;
   }
   
-  const tsTestInstance = new TsTest(process.cwd(), testPath, executionMode, logOptions, tags, startFromFile, stopAtFile);
+  const tsTestInstance = new TsTest(process.cwd(), testPath, executionMode, logOptions, tags, startFromFile, stopAtFile, timeoutSeconds);
   await tsTestInstance.run();
 };
 

ts/tstest.classes.tap.combinator.ts

@@ -10,6 +10,7 @@ import { TsTestLogger } from './tstest.logging.js';
 
 export class TapCombinator {
   tapParserStore: TapParser[] = [];
+  skippedFiles: string[] = [];
   private logger: TsTestLogger;
   
   constructor(logger: TsTestLogger) {
@@ -19,10 +20,14 @@ export class TapCombinator {
   addTapParser(tapParserArg: TapParser) {
     this.tapParserStore.push(tapParserArg);
   }
+  
+  addSkippedFile(filename: string) {
+    this.skippedFiles.push(filename);
+  }
 
   evaluate() {
-    // Call the logger's summary method
-    this.logger.summary();
+    // Call the logger's summary method with skipped files
+    this.logger.summary(this.skippedFiles);
     
     // Check for failures
     let failGlobal = false;

ts/tstest.classes.tap.parser.ts

@@ -31,6 +31,34 @@ export class TapParser {
   constructor(public fileName: string, logger?: TsTestLogger) {
     this.logger = logger;
   }
+  
+  /**
+   * Handle test file timeout
+   */
+  public handleTimeout(timeoutSeconds: number) {
+    // Create a fake failing test result for timeout
+    this._getNewTapTestResult();
+    this.activeTapTestResult.testOk = false;
+    this.activeTapTestResult.testSettled = true;
+    this.testStore.push(this.activeTapTestResult);
+    
+    // Set expected vs received to force failure
+    this.expectedTests = 1;
+    this.receivedTests = 0;
+    
+    // Log the timeout error
+    if (this.logger) {
+      this.logger.testResult(
+        `Test file timeout`,
+        false,
+        timeoutSeconds * 1000,
+        `Error: Test file exceeded timeout of ${timeoutSeconds} seconds`
+      );
+      this.logger.testErrorDetails(`Test execution was terminated after ${timeoutSeconds} seconds`);
+      // Force file end with failure
+      this.logger.testFileEnd(0, 1, timeoutSeconds * 1000);
+    }
+  }
 
   private _getNewTapTestResult() {
     this.activeTapTestResult = new TapTestResult(this.testStore.length + 1);
@@ -69,7 +97,7 @@ export class TapParser {
       } else if (this.testStatusRegex.test(logLine)) {
         logLineIsTapProtocol = true;
         const regexResult = this.testStatusRegex.exec(logLine);
-        const testId = parseInt(regexResult[2]);
+        // const testId = parseInt(regexResult[2]); // Currently unused
         const testOk = (() => {
           if (regexResult[1] === 'ok') {
             return true;
@@ -81,21 +109,16 @@ export class TapParser {
         const testMetadata = regexResult[5]; // This will be either "time=XXXms" or "SKIP reason" or "TODO reason"
         
         let testDuration = 0;
-        let isSkipped = false;
-        let isTodo = false;
         
         if (testMetadata) {
           const timeMatch = testMetadata.match(/time=(\d+)ms/);
-          const skipMatch = testMetadata.match(/SKIP\s*(.*)/);
-          const todoMatch = testMetadata.match(/TODO\s*(.*)/);
+          // const skipMatch = testMetadata.match(/SKIP\s*(.*)/); // Currently unused
+          // const todoMatch = testMetadata.match(/TODO\s*(.*)/); // Currently unused
           
           if (timeMatch) {
             testDuration = parseInt(timeMatch[1]);
-          } else if (skipMatch) {
-            isSkipped = true;
-          } else if (todoMatch) {
-            isTodo = true;
           }
+          // Skip/todo handling could be added here in the future
         }
 
         // test for protocol error - disabled as it's not critical
@@ -305,13 +328,16 @@ export class TapParser {
         this.logger.error(`Only ${this.receivedTests} out of ${this.expectedTests} completed!`);
       }
     }
-    if (!this.expectedTests) {
+    if (!this.expectedTests && this.receivedTests === 0) {
       if (this.logger) {
         this.logger.error('No tests were defined. Therefore the testfile failed!');
+        this.logger.testFileEnd(0, 1, 0); // Count as 1 failure
       }
     } else if (this.expectedTests !== this.receivedTests) {
       if (this.logger) {
         this.logger.error('The amount of received tests and expectedTests is unequal! Therefore the testfile failed');
+        const errorCount = this.getErrorTests().length || 1; // At least 1 error
+        this.logger.testFileEnd(this.receivedTests - errorCount, errorCount, 0);
       }
     } else if (this.getErrorTests().length === 0) {
       if (this.logger) {

ts/tstest.classes.tstest.ts

@@ -18,6 +18,7 @@ export class TsTest {
   public filterTags: string[];
   public startFromFile: number | null;
   public stopAtFile: number | null;
+  public timeoutSeconds: number | null;
 
   public smartshellInstance = new plugins.smartshell.Smartshell({
     executor: 'bash',
@@ -28,37 +29,26 @@ export class TsTest {
 
   public tsbundleInstance = new plugins.tsbundle.TsBundle();
 
-  constructor(cwdArg: string, testPathArg: string, executionModeArg: TestExecutionMode, logOptions: LogOptions = {}, tags: string[] = [], startFromFile: number | null = null, stopAtFile: number | null = null) {
+  constructor(cwdArg: string, testPathArg: string, executionModeArg: TestExecutionMode, logOptions: LogOptions = {}, tags: string[] = [], startFromFile: number | null = null, stopAtFile: number | null = null, timeoutSeconds: number | null = null) {
     this.executionMode = executionModeArg;
     this.testDir = new TestDirectory(cwdArg, testPathArg, executionModeArg);
     this.logger = new TsTestLogger(logOptions);
     this.filterTags = tags;
     this.startFromFile = startFromFile;
     this.stopAtFile = stopAtFile;
+    this.timeoutSeconds = timeoutSeconds;
   }
 
   async run() {
-    const testGroups = await this.testDir.getTestFileGroups();
-    let allFiles = [...testGroups.serial, ...Object.values(testGroups.parallelGroups).flat()];
-    
-    // Apply file range filtering if specified
-    if (this.startFromFile !== null || this.stopAtFile !== null) {
-      const startIndex = this.startFromFile ? this.startFromFile - 1 : 0; // Convert to 0-based index
-      const endIndex = this.stopAtFile ? this.stopAtFile : allFiles.length;
-      allFiles = allFiles.slice(startIndex, endIndex);
-      
-      // Filter the serial and parallel groups based on remaining files
-      testGroups.serial = testGroups.serial.filter(file => allFiles.includes(file));
-      Object.keys(testGroups.parallelGroups).forEach(groupName => {
-        testGroups.parallelGroups[groupName] = testGroups.parallelGroups[groupName].filter(file => allFiles.includes(file));
-        // Remove empty groups
-        if (testGroups.parallelGroups[groupName].length === 0) {
-          delete testGroups.parallelGroups[groupName];
-        }
-      });
+    // Move previous log files if --logfile option is used
+    if (this.logger.options.logFile) {
+      await this.movePreviousLogFiles();
     }
     
-    // Log test discovery
+    const testGroups = await this.testDir.getTestFileGroups();
+    const allFiles = [...testGroups.serial, ...Object.values(testGroups.parallelGroups).flat()];
+    
+    // Log test discovery - always show full count
     this.logger.testDiscovery(
       allFiles.length, 
       this.testDir.testPath,
@@ -71,7 +61,7 @@ export class TsTest {
     // Execute serial tests first
     for (const fileNameArg of testGroups.serial) {
       fileIndex++;
-      await this.runSingleTest(fileNameArg, fileIndex, allFiles.length, tapCombinator);
+      await this.runSingleTestOrSkip(fileNameArg, fileIndex, allFiles.length, tapCombinator);
     }
     
     // Execute parallel groups sequentially
@@ -85,7 +75,7 @@ export class TsTest {
         // Run all tests in this group in parallel
         const parallelPromises = groupFiles.map(async (fileNameArg) => {
           fileIndex++;
-          return this.runSingleTest(fileNameArg, fileIndex, allFiles.length, tapCombinator);
+          return this.runSingleTestOrSkip(fileNameArg, fileIndex, allFiles.length, tapCombinator);
         });
         
         await Promise.all(parallelPromises);
@@ -96,6 +86,24 @@ export class TsTest {
     tapCombinator.evaluate();
   }
   
+  private async runSingleTestOrSkip(fileNameArg: string, fileIndex: number, totalFiles: number, tapCombinator: TapCombinator) {
+    // Check if this file should be skipped based on range
+    if (this.startFromFile !== null && fileIndex < this.startFromFile) {
+      this.logger.testFileSkipped(fileNameArg, fileIndex, totalFiles, `before start range (${this.startFromFile})`);
+      tapCombinator.addSkippedFile(fileNameArg);
+      return;
+    }
+    
+    if (this.stopAtFile !== null && fileIndex > this.stopAtFile) {
+      this.logger.testFileSkipped(fileNameArg, fileIndex, totalFiles, `after stop range (${this.stopAtFile})`);
+      tapCombinator.addSkippedFile(fileNameArg);
+      return;
+    }
+    
+    // File is in range, run it
+    await this.runSingleTest(fileNameArg, fileIndex, totalFiles, tapCombinator);
+  }
+  
   private async runSingleTest(fileNameArg: string, fileIndex: number, totalFiles: number, tapCombinator: TapCombinator) {
     switch (true) {
       case process.env.CI && fileNameArg.includes('.nonci.'):
@@ -141,7 +149,30 @@ export class TsTest {
     const execResultStreaming = await this.smartshellInstance.execStreamingSilent(
       `tsrun ${fileNameArg}${tsrunOptions}`
     );
-    await tapParser.handleTapProcess(execResultStreaming.childProcess);
+    
+    // Handle timeout if specified
+    if (this.timeoutSeconds !== null) {
+      const timeoutMs = this.timeoutSeconds * 1000;
+      const timeoutPromise = new Promise<void>((_resolve, reject) => {
+        setTimeout(() => {
+          execResultStreaming.childProcess.kill('SIGTERM');
+          reject(new Error(`Test file timed out after ${this.timeoutSeconds} seconds`));
+        }, timeoutMs);
+      });
+      
+      try {
+        await Promise.race([
+          tapParser.handleTapProcess(execResultStreaming.childProcess),
+          timeoutPromise
+        ]);
+      } catch (error) {
+        // Handle timeout error
+        tapParser.handleTimeout(this.timeoutSeconds);
+      }
+    } else {
+      await tapParser.handleTapProcess(execResultStreaming.childProcess);
+    }
+    
     return tapParser;
   }
 
@@ -166,7 +197,7 @@ export class TsTest {
     });
     server.addRoute(
       '/test',
-      new plugins.typedserver.servertools.Handler('GET', async (req, res) => {
+      new plugins.typedserver.servertools.Handler('GET', async (_req, res) => {
         res.type('.html');
         res.write(`
         <html>
@@ -199,9 +230,10 @@ export class TsTest {
       });
     });
 
-    // lets do the browser bit
+    // lets do the browser bit with timeout handling
     await this.smartbrowserInstance.start();
-    const evaluation = await this.smartbrowserInstance.evaluateOnPage(
+    
+    const evaluatePromise = this.smartbrowserInstance.evaluateOnPage(
       `http://localhost:3007/test?bundleName=${bundleFileName}`,
       async () => {
         // lets enable real time comms
@@ -214,12 +246,12 @@ export class TsTest {
         const originalError = console.error;
 
         // Override console methods to capture the logs
-        console.log = (...args) => {
+        console.log = (...args: any[]) => {
           logStore.push(args.join(' '));
           ws.send(args.join(' '));
           originalLog(...args);
         };
-        console.error = (...args) => {
+        console.error = (...args: any[]) => {
           logStore.push(args.join(' '));
           ws.send(args.join(' '));
           originalError(...args);
@@ -258,6 +290,29 @@ export class TsTest {
         return logStore.join('\n');
       }
     );
+    
+    // Handle timeout if specified
+    if (this.timeoutSeconds !== null) {
+      const timeoutMs = this.timeoutSeconds * 1000;
+      const timeoutPromise = new Promise<void>((_resolve, reject) => {
+        setTimeout(() => {
+          reject(new Error(`Test file timed out after ${this.timeoutSeconds} seconds`));
+        }, timeoutMs);
+      });
+      
+      try {
+        await Promise.race([
+          evaluatePromise,
+          timeoutPromise
+        ]);
+      } catch (error) {
+        // Handle timeout error
+        tapParser.handleTimeout(this.timeoutSeconds);
+      }
+    } else {
+      await evaluatePromise;
+    }
+    
     await this.smartbrowserInstance.stop();
     await server.stop();
     wss.close();
@@ -270,4 +325,50 @@ export class TsTest {
   }
 
   public async runInDeno() {}
+  
+  private async movePreviousLogFiles() {
+    const logDir = plugins.path.join('.nogit', 'testlogs');
+    const previousDir = plugins.path.join('.nogit', 'testlogs', 'previous');
+    const errDir = plugins.path.join('.nogit', 'testlogs', '00err');
+    const diffDir = plugins.path.join('.nogit', 'testlogs', '00diff');
+    
+    try {
+      // Delete 00err and 00diff directories if they exist
+      if (await plugins.smartfile.fs.isDirectory(errDir)) {
+        await plugins.smartfile.fs.remove(errDir);
+      }
+      if (await plugins.smartfile.fs.isDirectory(diffDir)) {
+        await plugins.smartfile.fs.remove(diffDir);
+      }
+      
+      // Get all .log files in log directory (not in subdirectories)
+      const files = await plugins.smartfile.fs.listFileTree(logDir, '*.log');
+      const logFiles = files.filter(file => !file.includes('/'));
+      
+      if (logFiles.length === 0) {
+        return;
+      }
+      
+      // Ensure previous directory exists
+      await plugins.smartfile.fs.ensureDir(previousDir);
+      
+      // Move each log file to previous directory
+      for (const file of logFiles) {
+        const filename = plugins.path.basename(file);
+        const sourcePath = plugins.path.join(logDir, filename);
+        const destPath = plugins.path.join(previousDir, filename);
+        
+        try {
+          // Copy file to new location and remove original
+          await plugins.smartfile.fs.copy(sourcePath, destPath);
+          await plugins.smartfile.fs.remove(sourcePath);
+        } catch (error) {
+          // Silently continue if a file can't be moved
+        }
+      }
+    } catch (error) {
+      // Directory might not exist, which is fine
+      return;
+    }
+  }
 }

ts/tstest.logging.ts

@@ -30,12 +30,14 @@ export interface TestSummary {
   totalTests: number;
   totalPassed: number;
   totalFailed: number;
+  totalSkipped: number;
   totalDuration: number;
   fileResults: TestFileResult[];
+  skippedFiles: string[];
 }
 
 export class TsTestLogger {
-  private options: LogOptions;
+  public readonly options: LogOptions;
   private startTime: number;
   private fileResults: TestFileResult[] = [];
   private currentFileResult: TestFileResult | null = null;
@@ -245,6 +247,44 @@ export class TsTestLogger {
       this.log(this.format(`   Summary: ${passed}/${total} ${status}`, color));
     }
     
+    // If using --logfile, handle error copy and diff detection
+    if (this.options.logFile && this.currentTestLogFile) {
+      try {
+        const logContent = fs.readFileSync(this.currentTestLogFile, 'utf-8');
+        const logDir = path.dirname(this.currentTestLogFile);
+        const logBasename = path.basename(this.currentTestLogFile);
+        
+        // Create error copy if there were failures
+        if (failed > 0) {
+          const errorDir = path.join(logDir, '00err');
+          if (!fs.existsSync(errorDir)) {
+            fs.mkdirSync(errorDir, { recursive: true });
+          }
+          const errorLogPath = path.join(errorDir, logBasename);
+          fs.writeFileSync(errorLogPath, logContent);
+        }
+        
+        // Check for previous version and create diff if changed
+        const previousLogPath = path.join(logDir, 'previous', logBasename);
+        if (fs.existsSync(previousLogPath)) {
+          const previousContent = fs.readFileSync(previousLogPath, 'utf-8');
+          
+          // Simple check if content differs
+          if (previousContent !== logContent) {
+            const diffDir = path.join(logDir, '00diff');
+            if (!fs.existsSync(diffDir)) {
+              fs.mkdirSync(diffDir, { recursive: true });
+            }
+            const diffLogPath = path.join(diffDir, logBasename);
+            const diffContent = this.createDiff(previousContent, logContent, logBasename);
+            fs.writeFileSync(diffLogPath, diffContent);
+          }
+        }
+      } catch (error) {
+        // Silently fail to avoid disrupting the test run
+      }
+    }
+    
     // Clear the current test log file reference only if using --logfile
     if (this.options.logFile) {
       this.currentTestLogFile = null;
@@ -252,7 +292,7 @@ export class TsTestLogger {
   }
   
   // TAP output forwarding (for TAP protocol messages)
-  tapOutput(message: string, isError: boolean = false) {
+  tapOutput(message: string, _isError: boolean = false) {
     if (this.options.json) return;
     
     // Never show raw TAP protocol messages in console
@@ -282,6 +322,19 @@ export class TsTestLogger {
     }
   }
   
+  // Skipped test file
+  testFileSkipped(filename: string, index: number, total: number, reason: string) {
+    if (this.options.json) {
+      this.logJson({ event: 'fileSkipped', filename, index, total, reason });
+      return;
+    }
+    
+    if (this.options.quiet) return;
+    
+    this.log(this.format(`\n⏭️  ${filename} (${index}/${total})`, 'yellow'));
+    this.log(this.format(`   Skipped: ${reason}`, 'dim'));
+  }
+  
   // Browser console
   browserConsole(message: string, level: string = 'log') {
     if (this.options.json) {
@@ -317,15 +370,17 @@ export class TsTestLogger {
   }
   
   // Final summary
-  summary() {
+  summary(skippedFiles: string[] = []) {
     const totalDuration = Date.now() - this.startTime;
     const summary: TestSummary = {
-      totalFiles: this.fileResults.length,
+      totalFiles: this.fileResults.length + skippedFiles.length,
       totalTests: this.fileResults.reduce((sum, r) => sum + r.total, 0),
       totalPassed: this.fileResults.reduce((sum, r) => sum + r.passed, 0),
       totalFailed: this.fileResults.reduce((sum, r) => sum + r.failed, 0),
+      totalSkipped: skippedFiles.length,
       totalDuration,
-      fileResults: this.fileResults
+      fileResults: this.fileResults,
+      skippedFiles
     };
     
     if (this.options.json) {
@@ -346,6 +401,9 @@ export class TsTestLogger {
     this.log(this.format(`│ Total Tests:    ${summary.totalTests.toString().padStart(14)} │`, 'white'));
     this.log(this.format(`│ Passed:         ${summary.totalPassed.toString().padStart(14)} │`, 'green'));
     this.log(this.format(`│ Failed:         ${summary.totalFailed.toString().padStart(14)} │`, summary.totalFailed > 0 ? 'red' : 'green'));
+    if (summary.totalSkipped > 0) {
+      this.log(this.format(`│ Skipped:        ${summary.totalSkipped.toString().padStart(14)} │`, 'yellow'));
+    }
     this.log(this.format(`│ Duration:       ${totalDuration.toString().padStart(14)}ms │`, 'white'));
     this.log(this.format('└────────────────────────────────┘', 'dim'));
     
@@ -404,4 +462,48 @@ export class TsTestLogger {
       }
     }
   }
+  
+  // Create a diff between two log contents
+  private createDiff(previousContent: string, currentContent: string, filename: string): string {
+    const previousLines = previousContent.split('\n');
+    const currentLines = currentContent.split('\n');
+    
+    let diff = `DIFF REPORT: ${filename}\n`;
+    diff += `Generated: ${new Date().toISOString()}\n`;
+    diff += '='.repeat(80) + '\n\n';
+    
+    // Simple line-by-line comparison
+    const maxLines = Math.max(previousLines.length, currentLines.length);
+    let hasChanges = false;
+    
+    for (let i = 0; i < maxLines; i++) {
+      const prevLine = previousLines[i] || '';
+      const currLine = currentLines[i] || '';
+      
+      if (prevLine !== currLine) {
+        hasChanges = true;
+        if (i < previousLines.length && i >= currentLines.length) {
+          // Line was removed
+          diff += `- [Line ${i + 1}] ${prevLine}\n`;
+        } else if (i >= previousLines.length && i < currentLines.length) {
+          // Line was added
+          diff += `+ [Line ${i + 1}] ${currLine}\n`;
+        } else {
+          // Line was modified
+          diff += `- [Line ${i + 1}] ${prevLine}\n`;
+          diff += `+ [Line ${i + 1}] ${currLine}\n`;
+        }
+      }
+    }
+    
+    if (!hasChanges) {
+      diff += 'No changes detected.\n';
+    }
+    
+    diff += '\n' + '='.repeat(80) + '\n';
+    diff += `Previous version had ${previousLines.length} lines\n`;
+    diff += `Current version has ${currentLines.length} lines\n`;
+    
+    return diff;
+  }
 }