fix: query parameters are not passed correctly to WolframAlpha API

langchain/src/tools/tests/wolframalpha.test.ts

@@ -0,0 +1,46 @@
+import {afterEach, beforeEach, describe, expect} from "@jest/globals";
+import {WolframAlphaTool} from "../wolframalpha.js";
+
+const MOCK_APP_ID = '[MOCK_APP_ID]';
+const QUERY_1 = 'What is 2 + 2?';
+const MOCK_ANSWER = '[MOCK_ANSWER]';
+
+describe("wolfram alpha test suite", () => {
+
+  let fetchMock: jest.SpyInstance;
+
+  beforeEach(() => {
+    fetchMock = jest.spyOn(global, "fetch").mockImplementation(() => {
+      return Promise.resolve({
+        text: () => Promise.resolve(MOCK_ANSWER),
+      } as Response);
+    });
+  });
+
+  afterEach(() => {
+    fetchMock.mockRestore();
+  });
+
+  test("test query parameters passed correctly", async () => {
+    const wolframAlpha = new WolframAlphaTool({
+      appid: MOCK_APP_ID,
+    });
+    await wolframAlpha._call(QUERY_1);
+    const [url] = fetchMock.mock.calls[0];
+    const parsedUrl = new URL(url);
+    const params = new URLSearchParams(parsedUrl.search);
+
+    expect(fetchMock).toBeCalledTimes(1);
+    expect(params.get("appid")).toBe(MOCK_APP_ID);
+    expect(params.get("input")).toBe(QUERY_1);
+  });
+
+  test("test answer retrieved", async () => {
+    const wolframAlpha = new WolframAlphaTool({
+      appid: MOCK_APP_ID,
+    });
+
+    const answer = await wolframAlpha._call(QUERY_1);
+    expect(answer).toBe(MOCK_ANSWER);
+  });
+});

langchain/src/tools/wolframalpha.ts

@@ -31,7 +31,9 @@ export class WolframAlphaTool extends Tool {
   }
 
   async _call(query: string): Promise<string> {
-    const url = `https://www.wolframalpha.com/api/v1/llm-api?appid=${this.appid}&input=${query}`;
+    const url = `https://www.wolframalpha.com/api/v1/llm-api?appid=${this.appid}&input=${
+      encodeURIComponent(query)
+    }`;
     const res = await fetch(url);
 
     return res.text();