public void StoreElements_ThenRetrieve_SeesAllElements()
    {
        WithUniqueTempRegKey(regKey =>
        {
            // Arrange
            var repository = new RegistryXmlRepository(regKey, NullLoggerFactory.Instance);

            // Act
            repository.StoreElement(new XElement("element1"), friendlyName: null);
            repository.StoreElement(new XElement("element2"), friendlyName: null);
            repository.StoreElement(new XElement("element3"), friendlyName: null);
            var allElements = repository.GetAllElements();

            // Assert
            var orderedNames = allElements.Select(el => el.Name.LocalName).OrderBy(name => name);
            Assert.Equal(new[] { "element1", "element2", "element3" }, orderedNames);
        });
    }
    public void StoreElement_WithValidFriendlyName_UsesFriendlyName()
    {
        WithUniqueTempRegKey(regKey =>
        {
            // Arrange
            var element    = XElement.Parse("<element1 />");
            var repository = new RegistryXmlRepository(regKey, NullLoggerFactory.Instance);

            // Act
            repository.StoreElement(element, "valid-friendly-name");

            // Assert
            var valueNames = regKey.GetValueNames();
            var valueName  = valueNames.Single(); // only one value should've been created

            // value name should be "valid-friendly-name"
            Assert.Equal("valid-friendly-name", valueName, StringComparer.OrdinalIgnoreCase);

            // value contents should be "<element1 />"
            var parsedElement = XElement.Parse(regKey.GetValue(valueName) as string);
            XmlAssert.Equal("<element1 />", parsedElement);
        });
    }
    public void StoreElement_WithInvalidFriendlyName_CreatesNewGuidAsName(string friendlyName)
    {
        WithUniqueTempRegKey(regKey =>
        {
            // Arrange
            var element    = XElement.Parse("<element1 />");
            var repository = new RegistryXmlRepository(regKey, NullLoggerFactory.Instance);

            // Act
            repository.StoreElement(element, friendlyName);

            // Assert
            var valueNames = regKey.GetValueNames();
            var valueName  = valueNames.Single(); // only one value should've been created

            // value name should be "{GUID}"
            Guid parsedGuid = Guid.Parse(valueName as string);
            Assert.NotEqual(Guid.Empty, parsedGuid);

            // value contents should be "<element1 />"
            var parsedElement = XElement.Parse(regKey.GetValue(valueName) as string);
            XmlAssert.Equal("<element1 />", parsedElement);
        });
    }