public void Should_Update_Requirement()
        {
            var vacancyData           = new { Title = "C# Developer", Description = "Preffered with side ruby history", OpenDate = DateTime.Now, CloseDate = DateTime.Now.AddMonths(1) };
            var requirementData       = new { SkillType = SkillType.Technical, RequirementType = RequirementType.NiceToHave, Content = "Python" };
            var requirementUpdateData = new { SkillType = SkillType.Technical, RequirementType = RequirementType.NiceToHave, Content = "Python" };

            var vacancy = new Vacancy(vacancyData.Title, vacancyData.Description, vacancyData.OpenDate, vacancyData.CloseDate);

            vacancy.AddRequirement(new Requirement(requirementData.Content, requirementData.SkillType, requirementData.RequirementType));

            var requirement    = vacancy.Requirements.FirstOrDefault();
            var newRequirement = new Requirement(requirementUpdateData.Content, requirement.SkillType, requirementUpdateData.RequirementType);

            vacancy.UpdateRequirement(requirement, newRequirement);
            requirement = vacancy.Requirements.FirstOrDefault();

            Assert.NotEmpty(vacancy.Requirements);
            Assert.NotNull(requirement);
            Assert.Equal(newRequirement.Content, requirement.Content);
            Assert.Equal(newRequirement.SkillType, requirement.SkillType);
            Assert.Equal(newRequirement.RequirementType, requirement.RequirementType);
        }