public async Task When_GetAllSkillsForOccupation_Then_ShouldReturnSkillsList(string url, string apiKey)
        {
            // ARRANGE
            const string skillsJson = "{skills:[" +
                                      "{\"type\": \"competency\",\"relationshipType\": \"essential\",\"skill\": \"collect biological data\",\"alternativeLabels\": [\"biological data analysing\", \"analysing biological records\"],\"uri\": \"aaa\"}," +
                                      "{\"type\": \"competency\",\"relationshipType\": \"essential\",\"skill\": \"collect biological info\",\"alternativeLabels\": [\"biological data analysing\", \"analysing biological records\"],\"uri\": \"aaa\"}," +
                                      "{\"type\": \"competency\",\"relationshipType\": \"optional\",\"skill\": \"collect samples\",\"alternativeLabels\": [\"biological data collection\", \"analysing biological records\"],\"uri\": \"aaa\"}]}";
            var handlerMock      = MockHelpers.GetMockMessageHandler(skillsJson, HttpStatusCode.OK);
            var restClient       = new RestClient(handlerMock.Object);
            var subjectUnderTest = new ServiceTaxonomyRepository(restClient);
            var vm = new SelectSkillsCompositeViewModel();

            // ACTs
            var result = await subjectUnderTest.GetAllSkillsForOccupation <Skill[]>(url, apiKey, "http://data.europa.eu/esco/occupation/114e1eff-215e-47df-8e10-45a5b72f8197");

            vm.Skills = result.ToList();


            // ASSERT
            result.Should().NotBeNull();
            result.Length.Should().Be(3);


            handlerMock.Protected().Verify(
                "SendAsync",
                Times.Once(), // we expected a single external request
                ItExpr.Is <HttpRequestMessage>(req =>
                                               req.Method == HttpMethod.Post
                                               ),
                ItExpr.IsAny <CancellationToken>()
                );
        }
        public void When_OccupationSet_Then_ToReturnOccupation()
        {
            // Arrange.
            var vm = new SelectSkillsCompositeViewModel()
            {
                Occupation = "Tester"
            };

            // Assert.
            vm.Occupation.Should().Be("Tester");
        }