public bool TryUndoSteps_WithoutFailure(NonNegativeInt stepsCount)
{
//arrange
var(_, steps) = MigrationTestsContext.GenerateMigrationState(0, stepsCount);
var historyStack = new Stack <MigrationItem>(steps);
//act
var(executionHistory, executionResult) = MigrationHandler.TryUndoSteps(historyStack);
var originalVersions = steps.Select(x => x.Version.ToString());
var executedVersions = executionHistory.Select(r => r.Version.ToString());
//assert
return(executionResult.Type is ExecutionResultType.Success && originalVersions.SequenceEqual(executedVersions));
}
public Property TryUndoSteps_WithFailure(NonNegativeInt stepsCount, NonNegativeInt failurePosition)
{
bool Predicate()
{
//arrange
var(_, steps) = MigrationTestsContext.GenerateMigrationState(0, stepsCount);
steps[failurePosition.Item - 1] =
MigrationTestsContext.MigrationItem(steps[failurePosition.Item - 1].Version, ExecutionResult.Failure(null), throwExceptionOnUndo: true);
var historyStack = new Stack <MigrationItem>(steps);
//act
var(executionHistory, executionResult) = MigrationHandler.TryUndoSteps(historyStack);
var originalVersions = steps.Take(failurePosition.Item - 1).Select(x => x.Version.ToString());
var executedVersions = executionHistory.Reverse().Select(r => r.Version.ToString());
//assert
return(executionResult.Type is ExecutionResultType.Failure && originalVersions.SequenceEqual(executedVersions));
}
return(new Func <bool>(Predicate).When(stepsCount.Item >= failurePosition.Item && failurePosition.Item > 0));
}