implement CalDAV MCP server v1 with streamable HTTP tools

tests/errors.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it } from "vitest";
+import { ErrorCode } from "@modelcontextprotocol/sdk/types.js";
+import { CaldavHttpError, mapErrorToMcp } from "../src/errors.js";
+
+describe("mapErrorToMcp", () => {
+  it("maps 412 to invalid request conflict", () => {
+    const error = mapErrorToMcp(new CaldavHttpError(412, "PUT", "https://example.com", ""));
+    expect(error.code).toBe(ErrorCode.InvalidRequest);
+    expect(error.message.toLowerCase()).toContain("conflict");
+  });
+
+  it("maps 5xx to internal error", () => {
+    const error = mapErrorToMcp(new CaldavHttpError(503, "PROPFIND", "https://example.com", ""));
+    expect(error.code).toBe(ErrorCode.InternalError);
+  });
+});