public void GivenInitialisedIdentifier_WhenGetPricingFilename_ThenExpected()
        {
            // Arrange

            var identifier = new FileIdentifier("some-region", "some-operating-system");

            // Actual

            var actual = identifier.GetPricingFilename();

            // Assert

            actual.Should().Be("vm-pricing_some-region_some-operating-system.json");
        }