public async Task GetHeroByNameWithInvalidNameShouldReturnNull()
        {
            // Arrange
            HeroService heroService = this.GetHeroServiceInitialValues();
            Hero        hero        = new Hero()
            {
                Name = "HeroOne"
            };

            await this.context.Heroes.AddAsync(hero);

            // Act
            Hero heroByName = await heroService.GetHeroByName("Invalid name");

            // Assert
            Assert.Null(heroByName);
        }