1 files changed, 68 insertions, 0 deletions
diff --git a/integration-tests/write_file.test.ts b/integration-tests/write_file.test.ts
new file mode 100644
index 00000000..7809161e
--- /dev/null
+++ b/integration-tests/write_file.test.ts
@@ -0,0 +1,68 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { test } from 'node:test';
+import { strict as assert } from 'assert';
+import {
+  TestRig,
+  createToolCallErrorMessage,
+  printDebugInfo,
+  validateModelOutput,
+} from './test-helper.js';
+
+test('should be able to write a file', async () => {
+  const rig = new TestRig();
+  await rig.setup('should be able to write a file');
+  const prompt = `show me an example of using the write tool. put a dad joke in dad.txt`;
+
+  const result = await rig.run(prompt);
+
+  const foundToolCall = await rig.waitForToolCall('write_file');
+
+  // Add debugging information
+  if (!foundToolCall) {
+    printDebugInfo(rig, result);
+  }
+
+  const allTools = rig.readToolLogs();
+  assert.ok(
+    foundToolCall,
+    createToolCallErrorMessage(
+      'write_file',
+      allTools.map((t) => t.toolRequest.name),
+      result,
+    ),
+  );
+
+  // Validate model output - will throw if no output, warn if missing expected content
+  validateModelOutput(result, 'dad.txt', 'Write file test');
+
+  const newFilePath = 'dad.txt';
+
+  const newFileContent = rig.readFile(newFilePath);
+
+  // Add debugging for file content
+  if (newFileContent === '') {
+    console.error('File was created but is empty');
+    console.error(
+      'Tool calls:',
+      rig.readToolLogs().map((t) => ({
+        name: t.toolRequest.name,
+        args: t.toolRequest.args,
+      })),
+    );
+  }
+
+  assert.notEqual(newFileContent, '', 'Expected file to have content');
+
+  // Log success info if verbose
+  if (process.env.VERBOSE === 'true') {
+    console.log(
+      'File created successfully with content:',
+      newFileContent.substring(0, 100) + '...',
+    );
+  }
+});