/// <summary>
/// Enumerates the commands representing the scenarios defined by the <paramref name="method"/>.
/// </summary>
/// <param name="method">The scenario method.</param>
/// <returns>An instance of <see cref="IEnumerable{ITestCommand}"/> representing the scenarios defined by the <paramref name="method"/>.</returns>
/// <remarks>This method may be overridden.</remarks>
protected virtual IEnumerable <ICommand> EnumerateScenarioCommands(IMethodInfo method)
{
Guard.AgainstNullArgument("method", method);
Guard.AgainstNullArgumentProperty("method", "MethodInfo", method.MethodInfo);
var parameters = method.MethodInfo.GetParameters();
if (!parameters.Any())
{
return(new[] { new Command(method) });
}
var commands = new List <ICommand>();
foreach (var arguments in GetArgumentCollections(method.MethodInfo))
{
var closedTypeMethod = method;
Type[] typeArguments = null;
if (method.MethodInfo != null && method.MethodInfo.IsGenericMethodDefinition)
{
typeArguments = ResolveTypeArguments(method, arguments).ToArray();
closedTypeMethod = Reflector.Wrap(method.MethodInfo.MakeGenericMethod(typeArguments));
}
var generatedArguments = new List <Argument>();
for (var missingArgumentIndex = arguments.Length; missingArgumentIndex < parameters.Length; ++missingArgumentIndex)
{
var parameterType = parameters[missingArgumentIndex].ParameterType;
if (parameterType.IsGenericParameter)
{
Type concreteType = null;
var typeParameters = method.MethodInfo.GetGenericArguments();
for (var typeParameterIndex = 0; typeParameterIndex < typeParameters.Length; ++typeParameterIndex)
{
if (typeParameters[typeParameterIndex] == parameterType)
{
concreteType = typeArguments[typeParameterIndex];
break;
}
}
if (concreteType == null)
{
var message = string.Format(
CultureInfo.CurrentCulture, "The type of parameter \"{0}\" cannot be resolved.", parameters[missingArgumentIndex].Name);
throw new InvalidOperationException(message);
}
parameterType = concreteType;
}
generatedArguments.Add(new Argument(parameterType));
}
commands.Add(new Command(new MethodCall(closedTypeMethod, arguments.Concat(generatedArguments).ToArray(), typeArguments)));
}
return(commands);
}
/// <summary>
/// Enumerates the commands representing the backgrounds associated with the <paramref name="method"/>.
/// </summary>
/// <param name="method">The scenario method.</param>
/// <returns>An instance of <see cref="IEnumerable{ITestCommand}"/> representing the backgrounds associated with the <paramref name="method"/>.</returns>
protected virtual IEnumerable <ITestCommand> EnumerateBackgroundCommands(IMethodInfo method)
{
Guard.AgainstNullArgument("method", method);
Guard.AgainstNullArgumentProperty("method", "Class", method.Class);
return(method.Class.GetMethods().SelectMany(
candidateMethod => candidateMethod.GetCustomAttributes(typeof(BackgroundAttribute))
.Select(attribute => attribute.GetInstance <BackgroundAttribute>())
.SelectMany(backgroundAttribute => backgroundAttribute.CreateBackgroundCommands(candidateMethod))).ToArray());
}