public async Task TakeSnapshot_updates_snapshot_blob_if_exists(
Guid streamId, State pastState, State newState, IStateRehydrator <State> rehydrator)
{
// Arrange
Mock.Get(rehydrator)
.Setup(x => x.TryRehydrateState(streamId))
.ReturnsAsync(pastState);
BlobSnapshotter <State> sut = GenerateSut(rehydrator);
await sut.TakeSnapshot(streamId);
Mock.Get(rehydrator)
.Setup(x => x.TryRehydrateState(streamId))
.ReturnsAsync(newState);
// Act
await sut.TakeSnapshot(streamId);
// Assert
ICloudBlob blob = await GetBlob(streamId);
string content = await DownloadContent(blob);
State snapshot = JsonConvert.DeserializeObject <State>(content);
snapshot.Should().BeEquivalentTo(newState);
}
public async Task TakeSnapshot_sets_blob_properties_correctly_if_snapshot_blob_exists(
Guid streamId, State state, IStateRehydrator <State> rehydrator)
{
// Arrange
Mock.Get(rehydrator)
.Setup(x => x.TryRehydrateState(streamId))
.ReturnsAsync(state);
BlobSnapshotter <State> sut = GenerateSut(rehydrator);
await sut.TakeSnapshot(streamId);
ICloudBlob blob = await GetBlob(streamId);
blob.Properties.ContentType = "application/text";
blob.Properties.ContentEncoding = Encoding.ASCII.WebName;
await blob.SetPropertiesAsync();
// Act
await sut.TakeSnapshot(streamId);
// Assert
ICloudBlob actual = await GetBlob(streamId);
actual.Properties.ContentType.Should().Be("application/json");
actual.Properties.ContentEncoding.Should().BeEquivalentTo("UTF-8");
}
public async Task TryRestoreSnapshot_restores_snapshot_correctly_if_it_exists()
{
// Arrange
BlobSnapshotReader <State> sut = GenerateSut();
var streamId = Guid.NewGuid();
State state = new Fixture().Create <State>();
IStateRehydrator <State> rehydrator =
Mock.Of <IStateRehydrator <State> >();
Mock.Get(rehydrator)
.Setup(x => x.TryRehydrateState(streamId))
.ReturnsAsync(state);
var snapshotter = new BlobSnapshotter <State>(
rehydrator, JsonProcessor, SnapshotContainer);
await snapshotter.TakeSnapshot(streamId);
// Act
State actual = await sut.TryRestoreSnapshot(streamId);
// Assert
actual.Should().BeEquivalentTo(state);
}
public async Task TakeSnapshot_throws_exception_if_state_not_exists(
Guid streamId, IStateRehydrator <State> rehydrator)
{
// Arrange
Mock.Get(rehydrator)
.Setup(x => x.TryRehydrateState(streamId))
.ReturnsAsync(default(State));
BlobSnapshotter <State> sut = GenerateSut(rehydrator);
// Act
Func <Task> action = () => sut.TakeSnapshot(streamId);
// Assert
await action.Should().ThrowAsync <InvalidOperationException>();
}
