From a3dd1dbaf96b1ab43282d4eb3f8f93b8766b1e64 Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Sun, 8 Feb 2026 15:28:31 +0900
Subject: [PATCH] test(mcp): restore Tavily tests and add encoding edge case
 (#1627)

---
 src/mcp/websearch.test.ts | 151 +++++++++++++++++++++++++++++++++-----
 1 file changed, 133 insertions(+), 18 deletions(-)

diff --git a/src/mcp/websearch.test.ts b/src/mcp/websearch.test.ts
index 050c4297a..2b09e395d 100644
--- a/src/mcp/websearch.test.ts
+++ b/src/mcp/websearch.test.ts
@@ -1,18 +1,61 @@
+import { afterEach, beforeEach, describe, expect, test } from "bun:test"
 import { createWebsearchConfig } from "./websearch"
 
-declare const describe: (name: string, callback: () => void) => void
-declare const test: (name: string, callback: () => void) => void
-declare const expect: (value: unknown) => {
-  toContain: (expected: string) => void
-  toBeUndefined: () => void
-}
-declare const process: { env: Record<string, string | undefined> }
+describe("websearch MCP provider configuration", () => {
+  let originalExaApiKey: string | undefined
+  let originalTavilyApiKey: string | undefined
+
+  beforeEach(() => {
+    originalExaApiKey = process.env.EXA_API_KEY
+    originalTavilyApiKey = process.env.TAVILY_API_KEY
+
+    delete process.env.EXA_API_KEY
+    delete process.env.TAVILY_API_KEY
+  })
+
+  afterEach(() => {
+    if (originalExaApiKey === undefined) {
+      delete process.env.EXA_API_KEY
+    } else {
+      process.env.EXA_API_KEY = originalExaApiKey
+    }
+
+    if (originalTavilyApiKey === undefined) {
+      delete process.env.TAVILY_API_KEY
+    } else {
+      process.env.TAVILY_API_KEY = originalTavilyApiKey
+    }
+  })
+
+  test("returns Exa config when no config provided", () => {
+    //#given - no config
+
+    //#when
+    const result = createWebsearchConfig()
+
+    //#then
+    expect(result.url).toContain("mcp.exa.ai")
+    expect(result.url).toContain("tools=web_search_exa")
+    expect(result.type).toBe("remote")
+    expect(result.enabled).toBe(true)
+  })
+
+  test("returns Exa config when provider is 'exa'", () => {
+    //#given
+    const config = { provider: "exa" as const }
+
+    //#when
+    const result = createWebsearchConfig(config)
+
+    //#then
+    expect(result.url).toContain("mcp.exa.ai")
+    expect(result.url).toContain("tools=web_search_exa")
+    expect(result.type).toBe("remote")
+  })
 
-describe("createWebsearchConfig (Exa)", () => {
   test("appends exaApiKey query param when EXA_API_KEY is set", () => {
     //#given
     const apiKey = "test-exa-key-12345"
-    const originalExaApiKey = process.env.EXA_API_KEY
     process.env.EXA_API_KEY = apiKey
 
     //#when
@@ -20,25 +63,97 @@ describe("createWebsearchConfig (Exa)", () => {
 
     //#then
     expect(result.url).toContain(`exaApiKey=${encodeURIComponent(apiKey)}`)
-
-    process.env.EXA_API_KEY = originalExaApiKey
   })
 
   test("does not set x-api-key header when EXA_API_KEY is set", () => {
     //#given
-    const apiKey = "test-exa-key-12345"
-    const originalExaApiKey = process.env.EXA_API_KEY
-    process.env.EXA_API_KEY = apiKey
+    process.env.EXA_API_KEY = "test-exa-key-12345"
 
     //#when
     const result = createWebsearchConfig()
 
     //#then
     expect(result.headers).toBeUndefined()
-    if (result.headers) {
-      expect(result.headers["x-api-key"]).toBeUndefined()
-    }
+  })
 
-    process.env.EXA_API_KEY = originalExaApiKey
+  test("URL-encodes EXA_API_KEY when it contains special characters", () => {
+    //#given an EXA_API_KEY with special characters (+ & =)
+    const apiKey = "a+b&c=d"
+    process.env.EXA_API_KEY = apiKey
+
+    //#when createWebsearchConfig is called
+    const result = createWebsearchConfig()
+
+    //#then the URL contains the properly encoded key via encodeURIComponent
+    expect(result.url).toContain(`exaApiKey=${encodeURIComponent(apiKey)}`)
+  })
+
+  test("returns Tavily config when provider is 'tavily' and TAVILY_API_KEY set", () => {
+    //#given
+    const tavilyKey = "test-tavily-key-67890"
+    process.env.TAVILY_API_KEY = tavilyKey
+    const config = { provider: "tavily" as const }
+
+    //#when
+    const result = createWebsearchConfig(config)
+
+    //#then
+    expect(result.url).toContain("mcp.tavily.com")
+    expect(result.headers).toEqual({ Authorization: `Bearer ${tavilyKey}` })
+  })
+
+  test("throws error when provider is 'tavily' but TAVILY_API_KEY missing", () => {
+    //#given
+    delete process.env.TAVILY_API_KEY
+    const config = { provider: "tavily" as const }
+
+    //#when
+    const createTavilyConfig = () => createWebsearchConfig(config)
+
+    //#then
+    expect(createTavilyConfig).toThrow("TAVILY_API_KEY environment variable is required")
+  })
+
+  test("returns Exa when both keys present but no explicit provider", () => {
+    //#given
+    const exaKey = "test-exa-key"
+    process.env.EXA_API_KEY = exaKey
+    process.env.TAVILY_API_KEY = "test-tavily-key"
+
+    //#when
+    const result = createWebsearchConfig()
+
+    //#then
+    expect(result.url).toContain("mcp.exa.ai")
+    expect(result.url).toContain(`exaApiKey=${encodeURIComponent(exaKey)}`)
+    expect(result.headers).toBeUndefined()
+  })
+
+  test("Tavily config uses Authorization Bearer header format", () => {
+    //#given
+    const tavilyKey = "tavily-secret-key-xyz"
+    process.env.TAVILY_API_KEY = tavilyKey
+    const config = { provider: "tavily" as const }
+
+    //#when
+    const result = createWebsearchConfig(config)
+
+    //#then
+    expect(result.headers?.Authorization).toMatch(/^Bearer /)
+    expect(result.headers?.Authorization).toBe(`Bearer ${tavilyKey}`)
+  })
+
+  test("Exa config has no headers when EXA_API_KEY not set", () => {
+    //#given
+    delete process.env.EXA_API_KEY
+
+    //#when
+    const result = createWebsearchConfig()
+
+    //#then
+    expect(result.url).toContain("mcp.exa.ai")
+    expect(result.url).toContain("tools=web_search_exa")
+    expect(result.url).not.toContain("exaApiKey=")
+    expect(result.headers).toBeUndefined()
   })
 })