How to send request to apollo graphql server while doing integration testing in jest?

This is my server file.
In context I am not getting the request while my test is getting pass while test the required scenario.

export async function buildTestServer({
  user,
  headers,
  roles,
}: {
  user?: User;
  headers?: { [key: string]: string };
  roles?: Role;
}) {
  const schema = await tq.buildSchema({
    authChecker: AuthChecker,
    validate: false,
    resolvers: allResolvers(),
    scalarsMap: [{ type: GraphQLScalarType, scalar: DateTimeResolver }],
  });
  const server = new ApolloServer({
    schema,
    context: async ({ req }) => {
      const authHeader = headers?.authorization;
      if (authHeader) {
        const token = extractTokenFromAuthenticationHeader(authHeader);
        try {
          const user = await new UserPermissionsService(token).call();
          return { req, user };
        } catch {
          return { req };
        }
      } else {
        if (user) {
          let capabilities: any = [];
          if (roles) {
            capabilities = roles.capabilities;
          }
          return {
            req,
            user: {
              id: user.id,
              customerId: user.customerId,
              capabilities,
            },
          };
        } else {
          return { req };
        }
      }
    },
  });

  return server;
}

And this is my test file from where I am sending the request to the server.
My test is getting passed but I am not getting the request headers. I want to check the the request. Can anybody help me out ?

const GET_LIST = `
query GetList($listId: String!) {
  GetList(listId: $listId) {
    id
  }
}
`;

test('Get Lists', async () => {
  const customer = await CustomerFactory.create();
  const user = await UserFactory.create({ customerId: customer.id });
  const list = await ListFactory.create({
    customerId: customer.id,
  });
  const server = await buildTestServer({ user });
  const result = await server.executeOperation({
    query: GET_LIST,
    variables: {
     listId: list.id
    },
  });
  var length = Object.keys(result.data?.GetList).length;
  expect(length).toBeGreaterThan(0);
});