public void WhenUpdatingTheElementsInTheSelectionsListInTheViewModel_ThenResponseIsSetInTheModelAndValidationIsUpdated()
{
var question = new MultipleSelectionQuestion { Range = new[] { "a", "b", "c" }, MaxSelections = 2 };
var questionAsINDEI = question as INotifyDataErrorInfo;
var viewModel = new MultipleSelectionQuestionViewModel(question);
viewModel.Selections.Add("a");
CollectionAssert.AreEqual((ICollection)viewModel.Selections, question.Response.ToArray());
Assert.IsFalse(questionAsINDEI.HasErrors);
viewModel.Selections.Add("b");
CollectionAssert.AreEqual((ICollection)viewModel.Selections, question.Response.ToArray());
Assert.IsFalse(questionAsINDEI.HasErrors);
viewModel.Selections.Add("c");
CollectionAssert.AreEqual((ICollection)viewModel.Selections, question.Response.ToArray());
Assert.IsTrue(questionAsINDEI.HasErrors);
viewModel.Selections.Remove("a");
CollectionAssert.AreEqual((ICollection)viewModel.Selections, question.Response.ToArray());
Assert.IsFalse(questionAsINDEI.HasErrors);
}
public void WhenCreatingAViewModelForAQuestionWithNullResponse_ThenInitializesTheResponseToAnEmptyCollection()
{
var question = new MultipleSelectionQuestion { Range = new[] { "a", "b", "c" } };
var viewModel = new MultipleSelectionQuestionViewModel(question);
CollectionAssert.AreEqual(new string[0], question.Response.ToArray());
}
public void WhenQuestionIsNew_ThenItIsNotComplete()
{
var question =
new MultipleSelectionQuestion()
{
Range = new[] { "one", "two", "three" },
MaxSelections = 2
};
Assert.IsFalse(question.IsComplete);
}
public void WhenQuestionHasInvalidValue_ThenItIsNotComplete()
{
var question =
new MultipleSelectionQuestion()
{
Range = new[] { "one", "two", "three" },
MaxSelections = 2
};
question.Response = new[] { "one", "two", "three" };
Assert.IsFalse(question.IsComplete);
}
public void WhenUpdatingTheCollectionInitializedByTheViewModel_ThenTheViewModelNotifiesChangesToTheResponse()
{
var question = new MultipleSelectionQuestion { Range = new[] { "a", "b", "c" }, MaxSelections = 2 };
var viewModel = new MultipleSelectionQuestionViewModel(question);
int responseChanges = 0;
viewModel.ResponseChanged += (s, e) => responseChanges++;
viewModel.Selections.Add("a");
Assert.AreEqual(1, responseChanges);
viewModel.Selections.Add("b");
Assert.AreEqual(2, responseChanges);
viewModel.Selections.Add("c");
Assert.AreEqual(3, responseChanges);
viewModel.Selections.Remove("b");
Assert.AreEqual(4, responseChanges);
}
public void WhenSettingASelectionOnTheViewModel_ThenHasChangesIsTrue()
{
var question = new MultipleSelectionQuestion { Range = new[] { "a", "b", "c" }, MaxSelections = 2 };
var viewModel = new MultipleSelectionQuestionViewModel(question);
int responseChanges = 0;
viewModel.ResponseChanged += (s, e) => responseChanges++;
viewModel.Selections.Add("a");
Assert.IsTrue(responseChanges > 0);
}
public void WhenCreatingTheViewModel_ThenHasChangesIsFalse()
{
var question = new MultipleSelectionQuestion { Range = new[] { "a", "b", "c" }, MaxSelections = 2 };
var viewModel = new MultipleSelectionQuestionViewModel(question);
bool hasChanges = false;
viewModel.ResponseChanged += (o, e) => { hasChanges = true; };
Assert.IsFalse(hasChanges);
}
public void WhenResponseHasLessElementsThanMax_ThenIndicatesNoErrorOnResponse()
{
var question =
new MultipleSelectionQuestion()
{
Range = new[] { "one", "two", "three" },
MaxSelections = 2
};
var notifyErrorInfo = (INotifyDataErrorInfo)question;
question.Response = new[] { "one" };
Assert.IsFalse(notifyErrorInfo.GetErrors("Response").Cast<string>().Any());
}
public void WhenSettingResponseToNull_ThenIndicatesErrorOnResponse()
{
var question =
new MultipleSelectionQuestion()
{
Range = new[] { "one", "two", "three" },
MaxSelections = 2
};
var notifyErrorInfo = (INotifyDataErrorInfo)question;
question.Response = new[] { "one" };
Assert.IsFalse(notifyErrorInfo.GetErrors("Response").Cast<string>().Any());
question.Response = null;
Assert.IsTrue(notifyErrorInfo.GetErrors("Response").Cast<string>().Any());
}