test: 添加模型路由单元测试 (测试计划 05)

覆盖 isModelAlias、isModelFamilyAlias、getAPIProvider、
isFirstPartyAnthropicBaseUrl、firstPartyNameToCanonical，共 40 个测试用例。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/utils/model/__tests__/providers.test.ts

@@ -0,0 +1,84 @@
+import { describe, expect, test, beforeEach, afterEach } from "bun:test";
+import { getAPIProvider, isFirstPartyAnthropicBaseUrl } from "../providers";
+
+describe("getAPIProvider", () => {
+  const originalEnv = { ...process.env };
+
+  afterEach(() => {
+    delete process.env.CLAUDE_CODE_USE_BEDROCK;
+    delete process.env.CLAUDE_CODE_USE_VERTEX;
+    delete process.env.CLAUDE_CODE_USE_FOUNDRY;
+  });
+
+  test('returns "firstParty" by default', () => {
+    delete process.env.CLAUDE_CODE_USE_BEDROCK;
+    delete process.env.CLAUDE_CODE_USE_VERTEX;
+    delete process.env.CLAUDE_CODE_USE_FOUNDRY;
+    expect(getAPIProvider()).toBe("firstParty");
+  });
+
+  test('returns "bedrock" when CLAUDE_CODE_USE_BEDROCK is set', () => {
+    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
+    expect(getAPIProvider()).toBe("bedrock");
+  });
+
+  test('returns "vertex" when CLAUDE_CODE_USE_VERTEX is set', () => {
+    process.env.CLAUDE_CODE_USE_VERTEX = "1";
+    expect(getAPIProvider()).toBe("vertex");
+  });
+
+  test('returns "foundry" when CLAUDE_CODE_USE_FOUNDRY is set', () => {
+    process.env.CLAUDE_CODE_USE_FOUNDRY = "1";
+    expect(getAPIProvider()).toBe("foundry");
+  });
+
+  test("bedrock takes precedence over vertex", () => {
+    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
+    process.env.CLAUDE_CODE_USE_VERTEX = "1";
+    expect(getAPIProvider()).toBe("bedrock");
+  });
+});
+
+describe("isFirstPartyAnthropicBaseUrl", () => {
+  const originalBaseUrl = process.env.ANTHROPIC_BASE_URL;
+  const originalUserType = process.env.USER_TYPE;
+
+  afterEach(() => {
+    if (originalBaseUrl !== undefined) {
+      process.env.ANTHROPIC_BASE_URL = originalBaseUrl;
+    } else {
+      delete process.env.ANTHROPIC_BASE_URL;
+    }
+    if (originalUserType !== undefined) {
+      process.env.USER_TYPE = originalUserType;
+    } else {
+      delete process.env.USER_TYPE;
+    }
+  });
+
+  test("returns true when ANTHROPIC_BASE_URL is not set", () => {
+    delete process.env.ANTHROPIC_BASE_URL;
+    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
+  });
+
+  test("returns true for api.anthropic.com", () => {
+    process.env.ANTHROPIC_BASE_URL = "https://api.anthropic.com";
+    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
+  });
+
+  test("returns false for custom URL", () => {
+    process.env.ANTHROPIC_BASE_URL = "https://my-proxy.com";
+    expect(isFirstPartyAnthropicBaseUrl()).toBe(false);
+  });
+
+  test("returns false for invalid URL", () => {
+    process.env.ANTHROPIC_BASE_URL = "not-a-url";
+    expect(isFirstPartyAnthropicBaseUrl()).toBe(false);
+  });
+
+  test("returns true for staging URL when USER_TYPE is ant", () => {
+    process.env.ANTHROPIC_BASE_URL = "https://api-staging.anthropic.com";
+    process.env.USER_TYPE = "ant";
+    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
+  });
+});