public void Fetch_ClearsCachedExtension_AndFetchesNewExtension_WhenUnderlyingCollectionChanged()
{
// Arrange
int revision = 1;
var createdExtension = new TestExtension();
var replacementExtension = new TestExtension();
TestExtension capturedExtension = null;
var collection = CreateCollection <TestExtension>(
onRevision: () => revision,
extension: null,
onSet: e => capturedExtension = e);
var refs = new WorkContextExtensionReferences <ExtensionCache>(collection);
refs.Fetch <TestExtension>(ref refs.Cache.Test, e => createdExtension);
// Act
revision++;
var extension = refs.Fetch <TestExtension>(ref refs.Cache.Test, e => replacementExtension);
// Assert
Assert.NotNull(extension);
Assert.Same(replacementExtension, extension);
Assert.Equal(2, refs.Revision);
Assert.NotNull(capturedExtension);
Assert.Same(replacementExtension, capturedExtension);
}
public void Constructor_SetsProperties()
{
// Arrange
var collection = CreateCollection <object>(revision: 1);
// Act
var refs = new WorkContextExtensionReferences <object>(collection);
// Assert
Assert.Equal(1, refs.Revision);
Assert.Same(collection, refs.Extensions);
}
public void Fetch_FetchesExtension_FromCollection_WhenNotCached_AndExtensionExists()
{
// Arrange
var existingExtension = new TestExtension();
TestExtension capturedExtension = null;
var collection = CreateCollection <TestExtension>(
revision: 1,
extension: existingExtension,
onSet: e => capturedExtension = e);
var refs = new WorkContextExtensionReferences <ExtensionCache>(collection);
// Act
var extension = refs.Fetch <TestExtension>(ref refs.Cache.Test, e => new TestExtension());
// Assert
Assert.NotNull(extension);
Assert.Same(existingExtension, extension);
Assert.Null(capturedExtension);
}
public void Fetch_ReturnsCachedExtension_WhenCollectionUnchanged()
{
// Arrange
int revision = 1;
var createdExtension = new TestExtension();
TestExtension capturedExtension = null;
var collection = CreateCollection <TestExtension>(
onRevision: () => revision,
onGet: () => createdExtension,
onSet: e => capturedExtension = e);
var refs = new WorkContextExtensionReferences <ExtensionCache>(collection);
refs.Fetch <TestExtension>(ref refs.Cache.Test, e => createdExtension);
// Act
var extension = refs.Fetch <TestExtension>(ref refs.Cache.Test, e => new TestExtension());
// Assert
Assert.NotNull(extension);
Assert.Same(createdExtension, extension);
Assert.Equal(1, refs.Revision);
}
public void Fetch_CreatesExtension_UsingFactory_WhenNotCached_AndExtensionDoesNotExist()
{
// Arrange
int revision = 1;
var existingExtension = new TestExtension();
TestExtension capturedExtension = null;
var collection = CreateCollection <TestExtension>(
onRevision: () => revision,
extension: null,
onSet: e => capturedExtension = e);
var refs = new WorkContextExtensionReferences <ExtensionCache>(collection);
// Act
revision++;
var extension = refs.Fetch <TestExtension>(ref refs.Cache.Test, e => new TestExtension());
// Assert
Assert.NotNull(extension);
Assert.NotSame(existingExtension, extension);
Assert.NotNull(capturedExtension);
Assert.Equal(2, refs.Revision);
}
/// <summary>
/// Initialises a new instance of <see cref="WorkContext"/>.
/// </summary>
/// <param name="extensions"></param>
public WorkContext(IWorkContextExtensionCollection extensions)
{
_extensions = new WorkContextExtensionReferences <StandardExtensions>(extensions);
}