public void TestGetSubscriptionIdsAsync()
        {
            var armRepository   = new ArmRepository(new MockHttpClientWrapper());
            var subscriptionIds = armRepository.GetSubscriptionIdsAsync(null).Result;

            Assert.Equal(4, subscriptionIds.Count);
            Assert.True(subscriptionIds.Contains("00000000-0000-0000-0000-000000000001"));
            Assert.True(subscriptionIds.Contains("00000000-0000-0000-0000-000000000002"));
            Assert.True(subscriptionIds.Contains("00000000-0000-0000-0000-000000000003"));
            Assert.True(subscriptionIds.Contains("00000000-0000-0000-0000-000000000004"));
        }