refactor(core): model-dependent tool definitions (#18563)

packages/core/src/tools/definitions/resolver.test.ts

@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { Type } from '@google/genai';
+import { resolveToolDeclaration } from './resolver.js';
+import type { ToolDefinition } from './types.js';
+
+describe('resolveToolDeclaration', () => {
+  const mockDefinition: ToolDefinition = {
+    base: {
+      name: 'test_tool',
+      description: 'A test tool description',
+      parameters: {
+        type: Type.OBJECT,
+        properties: {
+          param1: { type: Type.STRING },
+        },
+      },
+    },
+  };
+
+  it('should return the base definition when no modelId is provided', () => {
+    const result = resolveToolDeclaration(mockDefinition);
+    expect(result).toEqual(mockDefinition.base);
+  });
+
+  it('should return the base definition when a modelId is provided (current implementation)', () => {
+    const result = resolveToolDeclaration(mockDefinition, 'gemini-1.5-pro');
+    expect(result).toEqual(mockDefinition.base);
+  });
+
+  it('should return the same object reference as base (current implementation)', () => {
+    const result = resolveToolDeclaration(mockDefinition);
+    expect(result).toBe(mockDefinition.base);
+  });
+});