Creating trpc context (express server) for testing without req and res objects.

Question

I have seen a few examples of tests with next auth or t3 stack that is using next-auth under the hood. 
My problem is that I don't understand what should my inner context object contain, because I'm using express server 😦

For example, this is my context and t object. Req and res are mandatory:

export async function createContext({req,res}: trpcExpress.CreateExpressContextOptions) {
    return {req, res};
}

export type Context = inferAsyncReturnType;

export const t = initTRPC.context().create({
    transformer: superjson,
});

Then, my require auth middleware function is:

export const isAuthedMiddleware = t.middleware(async ({ctx, next}) = {
    const {req, res,} = ctx;

const token: string | undefined = req.headers.authorization?.split(" ")[1];
    if (!token) {
        throw new TRPCError({code: "UNAUTHORIZED"});
    }
    // my internal check function
    if (await authCheckFunction(token) === null) {
        throw new TRPCError({
            code: "UNAUTHORIZED",
        });
    }
    const {
        userId,
        sessionId, role
    } = await anotherAuthCheckFunction(token, email);
    return next({
        ctx: {
            userEmail: email,
            userId,
            role
        },
    });

});

Of course, I cannot create called with this setup, because, I will need to have req and res object. 
It's not possible to use next-auth as well.

If you have any example express trpc testing code, it would be awesome if you showed me how this can be achieved.
If not, the question is:

How do I need to rewrite the context creation and what should the inner context accept and return? Should I get the headers and other data before the inner context?

Creating trpc context (express server) for testing without req and res objects.

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