public void GetPropertyName_ShouldThrowArgumentException_GivenMethodExpression()
{
// Arrange
// Act
// Assert
Assert.That(() => PropertyFromExpression.GetPropertyName <ClassWithProperty, int>(c => c.IntegerMethod()), Throws.ArgumentException);
}
public void GetPropertyName_ShouldReturnPropertyName_GivenPropertyExpression()
{
// Arrange
// Act
var actual = PropertyFromExpression.GetPropertyName <ClassWithProperty, int>(c => c.IntegerProperty);
// Assert
Assert.That(actual, Is.EqualTo(nameof(ClassWithProperty.IntegerProperty)));
}
public static bool ShouldThrow <T, TDuplicateKey>(IEnumerable <T> implementations, Expression <Func <T, TDuplicateKey> > duplicateKeySelector,
Func <TDuplicateKey, string> duplicateKeyFormatter, out string exceptionMessage) where T : notnull
{
exceptionMessage = string.Empty;
var groupsOfDuplicates = implementations
.GroupBy(duplicateKeySelector.Compile())
.Where(g => g.Count() > 1)
.ToList();
var duplicatesFound = groupsOfDuplicates.Any();
if (duplicatesFound)
{
var stringBuilder = new StringBuilder();
var propertyName = PropertyFromExpression.GetPropertyName(duplicateKeySelector);
stringBuilder.AppendLine(
$"Found multiple implementations of {typeof(T).FullName} for the same value of {propertyName}. Only one implementation per {propertyName} is allowed.");
foreach (var duplicates in groupsOfDuplicates)
{
var keyValue = duplicateKeyFormatter(duplicates.Key);
stringBuilder.AppendLine($"Duplicates for {propertyName} \"{keyValue}\":");
foreach (var implementation in duplicates)
{
stringBuilder.AppendLine($"- {implementation.GetType().FullName}");
}
}
exceptionMessage = stringBuilder.ToString();
}
return(duplicatesFound);
}
