feat: add more tests for tool built-ins (#5)

src/tests/helpers/testFs.ts

@@ -0,0 +1,65 @@
+/**
+ * Test filesystem utilities
+ * Provides helpers for creating temporary test directories and files
+ */
+
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+export class TestDirectory {
+  public readonly path: string;
+
+  constructor() {
+    this.path = mkdtempSync(join(tmpdir(), "letta-test-"));
+  }
+
+  /**
+   * Create a file in the test directory
+   */
+  createFile(relativePath: string, content: string): string {
+    const filePath = join(this.path, relativePath);
+    const dir = join(filePath, "..");
+    mkdirSync(dir, { recursive: true });
+    writeFileSync(filePath, content, "utf-8");
+    return filePath;
+  }
+
+  /**
+   * Create a binary file in the test directory
+   */
+  createBinaryFile(relativePath: string, buffer: Buffer): string {
+    const filePath = join(this.path, relativePath);
+    const dir = join(filePath, "..");
+    mkdirSync(dir, { recursive: true });
+    writeFileSync(filePath, buffer);
+    return filePath;
+  }
+
+  /**
+   * Create a directory in the test directory
+   */
+  createDir(relativePath: string): string {
+    const dirPath = join(this.path, relativePath);
+    mkdirSync(dirPath, { recursive: true });
+    return dirPath;
+  }
+
+  /**
+   * Get full path for a relative path
+   */
+  resolve(relativePath: string): string {
+    return join(this.path, relativePath);
+  }
+
+  /**
+   * Clean up the test directory
+   */
+  cleanup(): void {
+    try {
+      rmSync(this.path, { recursive: true, force: true });
+    } catch (error) {
+      console.warn(`Failed to cleanup test directory ${this.path}:`, error);
+    }
+  }
+}