public void Update_InitialItemDataDoesNotUpdateLastItemsChangedAtUtc()
{
// This test covers a false negative described in https://github.com/dotnet/project-system/issues/5386
// where the initial snapshot of items sets LastItemsChangedAtUtc, so if a project is up to date when
// it is loaded, then the items are considered changed *after* the last build, but MSBuild's up-to-date
// check will determine the project doesn't require a rebuild and so the output timestamps won't update.
// This previously left the project in a state where it would be considered out of date endlessly.
var projectSnapshot = new Dictionary <string, IProjectRuleSnapshotModel>()
{
[UpToDateCheckBuilt.SchemaName] = SimpleItems("BuiltOutputPath1")
};
var sourceSnapshot1 = new Dictionary <string, IProjectRuleSnapshotModel>()
{
[Compile.SchemaName] = SimpleItems("ItemPath1")
};
var sourceSnapshot2 = new Dictionary <string, IProjectRuleSnapshotModel>()
{
[Compile.SchemaName] = SimpleItems("ItemPath1", "ItemPath2")
};
var state = UpToDateCheckImplicitConfiguredInput.CreateEmpty(ProjectConfigurationFactory.Create("testConfiguration"));
Assert.Equal(DateTime.MinValue, state.LastItemsChangedAtUtc);
// Initial change does NOT set LastItemsChangedAtUtc
state = UpdateState(
state,
projectSnapshot,
sourceSnapshot1);
Assert.Equal(DateTime.MinValue, state.LastItemsChangedAtUtc);
// Broadcasting an update with no change to items does NOT set LastItemsChangedAtUtc
state = UpdateState(state);
Assert.Equal(DateTime.MinValue, state.LastItemsChangedAtUtc);
// Broadcasting changed items DOES set LastItemsChangedAtUtc
state = UpdateState(
state,
projectSnapshot,
sourceSnapshot2);
Assert.NotEqual(DateTime.MinValue, state.LastItemsChangedAtUtc);
}
