public void NullPattern_is_triggered()
{
string notNullString = "a string";
var failures = new AssertionFailureAnalyzer(CreateContext(() => notNullString == null)).AnalyzeAssertionFailures();
Assert(() => failures.Count == 1 && failures[0].FriendlyMessagePattern is NullPattern);
}
public void AnyPattern_is_triggered()
{
var list = new List <string>
{
"a", "b", "c"
};
var failures = new AssertionFailureAnalyzer(new AssertionFailureContext(new Assertion(() => list.Any(l => l.Length > 1), null, null), null)).AnalyzeAssertionFailures();
Assert(() => failures.Count == 1 && failures[0].FriendlyMessagePattern is AnyPattern);
}
public FormattableString TryGetFriendlyMessage(FailedAssertion assertion)
{
var methodCallExpression = (MethodCallExpression)assertion.Expression;
var collectionExpression = ExpressionHelper.GetInstanceOfMethodCall(methodCallExpression);
var filter = (LambdaExpression)methodCallExpression.Arguments[1];
var collection = ((IEnumerable)ExpressionHelper.EvaluateExpression(collectionExpression) !).Cast <object>();
var compiledFilter = filter.Compile(true);
var invalidMatches = new List <object>();
var moreItems = false;
var invalidCount = 0;
var subMessages = new List <FormattableString>();
var index = 0;
foreach (var obj in collection)
{
var isMatch = (bool)compiledFilter.DynamicInvoke(obj);
if (!isMatch)
{
invalidCount++;
if (invalidMatches.Count == 10)
{
moreItems = true;
}
else
{
invalidMatches.Add(obj);
var namedConstant = new NamedConstantExpression("item", obj);
var newExpression =
Expression.Lambda <Func <bool> >(
ExpressionHelper.ReplaceParameter(filter.Body, filter.Parameters[0], namedConstant));
var analyzer = new AssertionFailureAnalyzer(new AssertionFailureContext(new Assertion(newExpression, null, null), null));
var failures = analyzer.AnalyzeAssertionFailures();
foreach (var failure in failures)
{
if (failure.Message != null)
{
subMessages.Add(collectionExpression is MethodCallExpression
? $"[{index}] - {failure.Message}"
: (FormattableString)$"{collectionExpression}[{index}] - {failure.Message}");
}
}
}
}
index++;
}
FormattableString MessagesPerItem()
{
return(subMessages.Count switch
{
0 => $"",
1 when invalidCount == 1 => $@"
{subMessages[0]}",
_ => $@"
Messages per item:
{subMessages}"
});
}
