Enhance test coverage by adding new cases for file listing, reading, and ripgrep functionalities. Implement tests for hidden files, depth handling, and path normalization in list_files tests. Expand read_file tests to cover line skipping and reading from empty files. Improve ripgrep tests with various pattern matching scenarios, including regex handling and file pattern exclusions.

tests/run-readfile-tests.js

@@ -114,6 +114,38 @@ function cases() {
     expect: { equals: Array.from({ length: 400 }, (_, i) => `L${i + 1}`).join('\n') }
   });
 
+  // 7. Skip beyond file length -> empty
+  list.push({
+    name: 'skip beyond length returns empty',
+    before: { 's.txt': 'A\nB' },
+    args: async ({ dir }) => ({ path: path.relative(chrootRoot, path.join(dir, 's.txt')), linesToSkip: 10, linesToRead: 5 }),
+    expect: { equals: '' }
+  });
+
+  // 8. Skip to last line and read one
+  list.push({
+    name: 'skip to last line and read one',
+    before: { 't.txt': 'L1\nL2\nL3' },
+    args: async ({ dir }) => ({ path: path.relative(chrootRoot, path.join(dir, 't.txt')), linesToSkip: 2, linesToRead: 1 }),
+    expect: { equals: 'L3' }
+  });
+
+  // 9. Read exactly N lines from middle
+  list.push({
+    name: 'read middle two lines',
+    before: { 'u.txt': 'A\nB\nC\nD' },
+    args: async ({ dir }) => ({ path: path.relative(chrootRoot, path.join(dir, 'u.txt')), linesToSkip: 1, linesToRead: 2 }),
+    expect: { equals: 'B\nC' }
+  });
+
+  // 10. Empty file read -> empty string
+  list.push({
+    name: 'empty file read',
+    before: { 'empty.txt': '' },
+    args: async ({ dir }) => ({ path: path.relative(chrootRoot, path.join(dir, 'empty.txt')), linesToSkip: 0, linesToRead: 100 }),
+    expect: { equals: '' }
+  });
+
   return list;
 }