test: add RPC disconnection handling test case

__tests__/e2e/rpc-disconnected.test.ts

@@ -0,0 +1,40 @@
+import { RPCError, RPCErrorCode } from "@/core/RPCError";
+import { RPCHandler } from "@/index"
+import { getRandomAvailablePort } from "@/utils/utils";
+
+type serverProvider = { test: () => Promise<string> };
+
+describe('Rpc disconnected test', () => {
+    test('main', async () => {
+        const port = await getRandomAvailablePort();
+
+        const server = new RPCHandler();
+        server.setProvider<serverProvider>({
+            test() {
+                return new Promise<string>((resolve) => setTimeout(() => resolve('ok'), 1000))
+            },
+        })
+        await server.listen({
+            port,
+        });
+
+        const client = new RPCHandler();
+        const session = await client.connect({
+            url: `http://localhost:${port}`,
+        });
+        const api = session.getAPI<serverProvider>();
+
+        const callPromise = api.test()
+
+        await session.connection.close();
+        await expect(api.test()).rejects.toMatchObject(
+            expect.objectContaining({
+                constructor: RPCError,
+                errorCode: RPCErrorCode.CONNECTION_DISCONNECTED
+            })
+        );
+        await expect(callPromise).rejects.toBeInstanceOf(RPCError);
+        await expect(callPromise).rejects
+            .toHaveProperty('errorCode', RPCErrorCode.CONNECTION_DISCONNECTED);
+    })
+})