test: add hunk splitting tests for handling large diffs with non-contiguous changes

src/core/diff/strategies/__tests__/new-unified.test.ts

@@ -547,4 +547,193 @@ if (otherCondition) {
       }
     });
   });
+
+  describe('hunk splitting', () => {
+    it('should handle large diffs with multiple non-contiguous changes', async () => {
+      const original = `import { readFile } from 'fs';
+import { join } from 'path';
+import { Logger } from './logger';
+
+const logger = new Logger();
+
+async function processFile(filePath: string) {
+  try {
+    const data = await readFile(filePath, 'utf8');
+    logger.info('File read successfully');
+    return data;
+  } catch (error) {
+    logger.error('Failed to read file:', error);
+    throw error;
+  }
+}
+
+function validateInput(input: string): boolean {
+  if (!input) {
+    logger.warn('Empty input received');
+    return false;
+  }
+  return input.length > 0;
+}
+
+async function writeOutput(data: string) {
+  logger.info('Processing output');
+  // TODO: Implement output writing
+  return Promise.resolve();
+}
+
+function parseConfig(configPath: string) {
+  logger.debug('Reading config from:', configPath);
+  // Basic config parsing
+  return {
+    enabled: true,
+    maxRetries: 3
+  };
+}
+
+export {
+  processFile,
+  validateInput,
+  writeOutput,
+  parseConfig
+};`;
+
+      const diff = `--- a/file.ts
++++ b/file.ts
+@@ ... @@
+-import { readFile } from 'fs';
++import { readFile, writeFile } from 'fs';
+ import { join } from 'path';
+-import { Logger } from './logger';
++import { Logger } from './utils/logger';
++import { Config } from './types';
+ 
+-const logger = new Logger();
++const logger = new Logger('FileProcessor');
+ 
+ async function processFile(filePath: string) {
+   try {
+     const data = await readFile(filePath, 'utf8');
+-    logger.info('File read successfully');
++    logger.info(\`File \${filePath} read successfully\`);
+     return data;
+   } catch (error) {
+-    logger.error('Failed to read file:', error);
++    logger.error(\`Failed to read file \${filePath}:\`, error);
+     throw error;
+   }
+ }
+ 
+ function validateInput(input: string): boolean {
+   if (!input) {
+-    logger.warn('Empty input received');
++    logger.warn('Validation failed: Empty input received');
+     return false;
+   }
+-  return input.length > 0;
++  return input.trim().length > 0;
+ }
+ 
+-async function writeOutput(data: string) {
+-  logger.info('Processing output');
+-  // TODO: Implement output writing
+-  return Promise.resolve();
++async function writeOutput(data: string, outputPath: string) {
++  try {
++    await writeFile(outputPath, data, 'utf8');
++    logger.info(\`Output written to \${outputPath}\`);
++  } catch (error) {
++    logger.error(\`Failed to write output to \${outputPath}:\`, error);
++    throw error;
++  }
+ }
+ 
+-function parseConfig(configPath: string) {
+-  logger.debug('Reading config from:', configPath);
+-  // Basic config parsing
+-  return {
+-    enabled: true,
+-    maxRetries: 3
+-  };
++async function parseConfig(configPath: string): Promise<Config> {
++  try {
++    const configData = await readFile(configPath, 'utf8');
++    logger.debug(\`Reading config from \${configPath}\`);
++    return JSON.parse(configData);
++  } catch (error) {
++    logger.error(\`Failed to parse config from \${configPath}:\`, error);
++    throw error;
++  }
+ }
+ 
+ export {
+   processFile,
+   validateInput,
+   writeOutput,
+-  parseConfig
++  parseConfig,
++  type Config
+ };`;
+
+      const expected = `import { readFile, writeFile } from 'fs';
+import { join } from 'path';
+import { Logger } from './utils/logger';
+import { Config } from './types';
+
+const logger = new Logger('FileProcessor');
+
+async function processFile(filePath: string) {
+  try {
+    const data = await readFile(filePath, 'utf8');
+    logger.info(\`File \${filePath} read successfully\`);
+    return data;
+  } catch (error) {
+    logger.error(\`Failed to read file \${filePath}:\`, error);
+    throw error;
+  }
+}
+
+function validateInput(input: string): boolean {
+  if (!input) {
+    logger.warn('Validation failed: Empty input received');
+    return false;
+  }
+  return input.trim().length > 0;
+}
+
+async function writeOutput(data: string, outputPath: string) {
+  try {
+    await writeFile(outputPath, data, 'utf8');
+    logger.info(\`Output written to \${outputPath}\`);
+  } catch (error) {
+    logger.error(\`Failed to write output to \${outputPath}:\`, error);
+    throw error;
+  }
+}
+
+async function parseConfig(configPath: string): Promise<Config> {
+  try {
+    const configData = await readFile(configPath, 'utf8');
+    logger.debug(\`Reading config from \${configPath}\`);
+    return JSON.parse(configData);
+  } catch (error) {
+    logger.error(\`Failed to parse config from \${configPath}:\`, error);
+    throw error;
+  }
+}
+
+export {
+  processFile,
+  validateInput,
+  writeOutput,
+  parseConfig,
+  type Config
+};`;
+
+      const result = await strategy.applyDiff(original, diff);
+      expect(result.success).toBe(true);
+      if (result.success) {
+        expect(result.content).toBe(expected);
+      }
+    });
+  });
 });