1 files changed, 106 insertions, 0 deletions
diff --git a/packages/server/src/core/prompts.test.ts b/packages/server/src/core/prompts.test.ts
new file mode 100644
index 00000000..49502f92
--- /dev/null
+++ b/packages/server/src/core/prompts.test.ts
@@ -0,0 +1,106 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { getCoreSystemPrompt } from './prompts.js'; // Adjust import path
+import * as process from 'node:process';
+
+// Mock tool names if they are dynamically generated or complex
+vi.mock('../tools/ls', () => ({ LSTool: { Name: 'list_directory' } }));
+vi.mock('../tools/edit', () => ({ EditTool: { Name: 'replace' } }));
+vi.mock('../tools/glob', () => ({ GlobTool: { Name: 'glob' } }));
+vi.mock('../tools/grep', () => ({ GrepTool: { Name: 'search_file_content' } }));
+vi.mock('../tools/read-file', () => ({ ReadFileTool: { Name: 'read_file' } }));
+vi.mock('../tools/read-many-files', () => ({
+  ReadManyFilesTool: { Name: 'read_many_files' },
+}));
+vi.mock('../tools/shell', () => ({
+  ShellTool: { Name: 'execute_bash_command' },
+}));
+vi.mock('../tools/write-file', () => ({
+  WriteFileTool: { Name: 'write_file' },
+}));
+
+describe('Core System Prompt (prompts.ts)', () => {
+  // Store original env vars that we modify
+  let originalSandboxEnv: string | undefined;
+
+  beforeEach(() => {
+    // Store original value before each test
+    originalSandboxEnv = process.env.SANDBOX;
+  });
+
+  afterEach(() => {
+    // Restore original value after each test
+    if (originalSandboxEnv === undefined) {
+      delete process.env.SANDBOX;
+    } else {
+      process.env.SANDBOX = originalSandboxEnv;
+    }
+  });
+
+  it('should return the base prompt when no userMemory is provided', () => {
+    delete process.env.SANDBOX; // Ensure default state for snapshot
+    const prompt = getCoreSystemPrompt();
+    expect(prompt).not.toContain('---\n\n'); // Separator should not be present
+    expect(prompt).toContain('You are an interactive CLI agent'); // Check for core content
+    expect(prompt).toMatchSnapshot(); // Use snapshot for base prompt structure
+  });
+
+  it('should return the base prompt when userMemory is empty string', () => {
+    delete process.env.SANDBOX;
+    const prompt = getCoreSystemPrompt('');
+    expect(prompt).not.toContain('---\n\n');
+    expect(prompt).toContain('You are an interactive CLI agent');
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it('should return the base prompt when userMemory is whitespace only', () => {
+    delete process.env.SANDBOX;
+    const prompt = getCoreSystemPrompt('   \n  \t ');
+    expect(prompt).not.toContain('---\n\n');
+    expect(prompt).toContain('You are an interactive CLI agent');
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it('should append userMemory with separator when provided', () => {
+    delete process.env.SANDBOX;
+    const memory = 'This is custom user memory.\nBe extra polite.';
+    const expectedSuffix = `\n\n---\n\n${memory}`;
+    const prompt = getCoreSystemPrompt(memory);
+
+    expect(prompt.endsWith(expectedSuffix)).toBe(true);
+    expect(prompt).toContain('You are an interactive CLI agent'); // Ensure base prompt follows
+    expect(prompt).toMatchSnapshot(); // Snapshot the combined prompt
+  });
+
+  it('should include sandbox-specific instructions when SANDBOX env var is set', () => {
+    process.env.SANDBOX = 'true'; // Generic sandbox value
+    const prompt = getCoreSystemPrompt();
+    expect(prompt).toContain('# Sandbox');
+    expect(prompt).not.toContain('# MacOS Seatbelt');
+    expect(prompt).not.toContain('# Outside of Sandbox');
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it('should include seatbelt-specific instructions when SANDBOX env var is "sandbox-exec"', () => {
+    process.env.SANDBOX = 'sandbox-exec';
+    const prompt = getCoreSystemPrompt();
+    expect(prompt).toContain('# MacOS Seatbelt');
+    expect(prompt).not.toContain('# Sandbox');
+    expect(prompt).not.toContain('# Outside of Sandbox');
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it('should include non-sandbox instructions when SANDBOX env var is not set', () => {
+    delete process.env.SANDBOX; // Ensure it's not set
+    const prompt = getCoreSystemPrompt();
+    expect(prompt).toContain('# Outside of Sandbox');
+    expect(prompt).not.toContain('# Sandbox');
+    expect(prompt).not.toContain('# MacOS Seatbelt');
+    expect(prompt).toMatchSnapshot();
+  });
+});