You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: server_session_test.go
    path of file: ./repos/mongo-go-driver/x/mongo/driver/session
    
    the code of the file until where you have to start completion: // Copyright (C) MongoDB, Inc. 2017-present.
//
// Licensed under the Apache License, Version 
    
func TestServerSession(t *testing.T) {
	int64ToPtr := func(i64 int64) *int64 { return &i64 }

	t.Run("Expired", func(t *testing.T) {
		t.Run("non-lb mode", func(t *testing.T) {
			sess, err := newServerSession()
			assert.Nil(t, err, "newServerSession error: %v", err)

			// The session should be expired if timeoutMinutes is 0 or if its last used time is too old.
			assert.True(t, sess.expired(topologyDescription{}), "expected session to be expired when timeoutMinutes=0")
			sess.LastUsed = time.Now().Add(-30 * time.Minute)
			topoDesc := topologyDescription{timeoutMinutes: int64ToPtr(30)}
			assert.True(t, sess.expired(topoDesc), "expected session to be expired when timeoutMinutes=30")
		})
		t.Run("lb mode", func(t *testing.T) {
			sess, err := newServerSession()
			assert.Nil(t, err, "newServerSession error: %v", err)

			// The session should never be considered expired.
			topoDesc := topologyDescription{kind: description.LoadBalanced}
			assert.False(t, sess.expired(topoDesc), "session reported that it was expired in LB mode with timeoutMinutes=0")

			sess.LastUsed = time.Now().Add(-30 * time.Minute)
			topoDesc.timeoutMinutes = int64ToPtr(10)
			assert.False(t, sess.expired(topoDesc), "session reported that it was expired in LB mode with timeoutMinutes=10")
		})
	})
}