1 files changed, 63 insertions, 0 deletions
diff --git a/packages/core/src/test-utils/tools.ts b/packages/core/src/test-utils/tools.ts
new file mode 100644
index 00000000..b168db9c
--- /dev/null
+++ b/packages/core/src/test-utils/tools.ts
@@ -0,0 +1,63 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { vi } from 'vitest';
+import {
+  BaseTool,
+  Icon,
+  ToolCallConfirmationDetails,
+  ToolResult,
+} from '../tools/tools.js';
+import { Schema, Type } from '@google/genai';
+
+/**
+ * A highly configurable mock tool for testing purposes.
+ */
+export class MockTool extends BaseTool<{ [key: string]: unknown }, ToolResult> {
+  executeFn = vi.fn();
+  shouldConfirm = false;
+
+  constructor(
+    name = 'mock-tool',
+    displayName?: string,
+    description = 'A mock tool for testing.',
+    params: Schema = {
+      type: Type.OBJECT,
+      properties: { param: { type: Type.STRING } },
+    },
+  ) {
+    super(name, displayName ?? name, description, Icon.Hammer, params);
+  }
+
+  async execute(
+    params: { [key: string]: unknown },
+    _abortSignal: AbortSignal,
+  ): Promise<ToolResult> {
+    const result = this.executeFn(params);
+    return (
+      result ?? {
+        llmContent: `Tool ${this.name} executed successfully.`,
+        returnDisplay: `Tool ${this.name} executed successfully.`,
+      }
+    );
+  }
+
+  async shouldConfirmExecute(
+    _params: { [key: string]: unknown },
+    _abortSignal: AbortSignal,
+  ): Promise<ToolCallConfirmationDetails | false> {
+    if (this.shouldConfirm) {
+      return {
+        type: 'exec' as const,
+        title: `Confirm ${this.displayName}`,
+        command: this.name,
+        rootCommand: this.name,
+        onConfirm: async () => {},
+      };
+    }
+    return false;
+  }
+}