ACPX extension: split ACP stream parser and test fixtures

extensions/acpx/src/runtime-internals/jsonrpc.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect, it } from "vitest";
+import { isAcpJsonRpcMessage, isJsonRpcId, normalizeJsonRpcId } from "./jsonrpc.js";
+
+describe("jsonrpc helpers", () => {
+  it("validates json-rpc ids", () => {
+    expect(isJsonRpcId(null)).toBe(true);
+    expect(isJsonRpcId("abc")).toBe(true);
+    expect(isJsonRpcId(12)).toBe(true);
+    expect(isJsonRpcId(Number.NaN)).toBe(false);
+    expect(isJsonRpcId({})).toBe(false);
+  });
+
+  it("normalizes json-rpc ids", () => {
+    expect(normalizeJsonRpcId("abc")).toBe("abc");
+    expect(normalizeJsonRpcId(12)).toBe("12");
+    expect(normalizeJsonRpcId(null)).toBeNull();
+    expect(normalizeJsonRpcId(undefined)).toBeNull();
+  });
+
+  it("accepts request, response, and notification shapes", () => {
+    expect(
+      isAcpJsonRpcMessage({
+        jsonrpc: "2.0",
+        method: "session/prompt",
+        id: 1,
+      }),
+    ).toBe(true);
+
+    expect(
+      isAcpJsonRpcMessage({
+        jsonrpc: "2.0",
+        id: 1,
+        result: {
+          stopReason: "end_turn",
+        },
+      }),
+    ).toBe(true);
+
+    expect(
+      isAcpJsonRpcMessage({
+        jsonrpc: "2.0",
+        method: "session/update",
+      }),
+    ).toBe(true);
+  });
+
+  it("rejects malformed result/error response shapes", () => {
+    expect(
+      isAcpJsonRpcMessage({
+        jsonrpc: "2.0",
+        id: 1,
+      }),
+    ).toBe(false);
+
+    expect(
+      isAcpJsonRpcMessage({
+        jsonrpc: "2.0",
+        id: 1,
+        result: {},
+        error: {
+          code: -1,
+          message: "bad",
+        },
+      }),
+    ).toBe(false);
+  });
+});