public void Counts_pure_generic_collection() // Implemented ICollection<T> only
{
var counter = new EnumerableCounter(GetHashSet());
AssertStrategies(counter.Count(), CountingStrategyName.ByCountGetter, CountingStrategyName.ByEnumeratingElements);
}
public void Counts_mixed_generic_collection() // Implemented both ICollection and ICollection<T>
{
var counter = new EnumerableCounter(GetGenericList());
AssertStrategies(counter.Count(), CountingStrategyName.ByCountGetter, CountingStrategyName.ByEnumeratingElements);
}
public void Counts_array()
{
var counter = new EnumerableCounter(GetArray());
AssertStrategies(counter.Count(), CountingStrategyName.ByLengthGetter);
}
public void Counts_custom_enumerable_with_count()
{
var counter = new EnumerableCounter(new CustomEnumerable());
AssertStrategies(counter.Count(), CountingStrategyName.ByEnumeratingElements, CountingStrategyName.ByReflectedCountGetter);
}
public void Counts_simple_enumerable()
{
var counter = new EnumerableCounter(GetSimpleEnumerable());
AssertStrategies(counter.Count(), CountingStrategyName.ByEnumeratingElements);
}
/// <summary>
/// Verifies that the specified sequence, collection, or array contains the expected number of elements.
/// </summary>
/// <remarks>
/// <para>
/// The assertion counts the elements according to the underlying type of the sequence.
/// <list type="bullet">
/// <item>Uses <see cref="Array.Length"/> if the sequence is an array.</item>
/// <item>Uses <see cref="ICollection.Count"/> or <see cref="ICollection{T}.Count"/> if the sequence is a collection such as <see cref="List{T}"/> or <see cref="Dictionary{K,V}"/>. It enumerates and counts the elements as well.</item>
/// <item>Enumerates and counts the elements if the sequence is a simple <see cref="IEnumerable"/>.</item>
/// </list>
/// </para>
/// </remarks>
/// <param name="expectedCount">The expected number of elements.</param>
/// <param name="values">The enumeration of elements to count.</param>
/// <param name="messageFormat">The custom assertion message format, or null if none.</param>
/// <param name="messageArgs">The custom assertion message arguments, or null if none.</param>
/// <exception cref="AssertionException">Thrown if the verification failed unless the current <see cref="AssertionContext.AssertionFailureBehavior" /> indicates otherwise.</exception>
/// <exception cref="ArgumentOutOfRangeException">Thrown if <paramref name="expectedCount"/> is negative.</exception>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="values"/> is null.</exception>
public static void Count(int expectedCount, IEnumerable values, string messageFormat, params object[] messageArgs)
{
if (expectedCount < 0)
throw new ArgumentOutOfRangeException("expectedCount", "The expected count value must be greater than or equal to 0.");
AssertionHelper.Verify(() =>
{
var counter = new EnumerableCounter(values);
var failures = new List<ICountingStrategy>();
foreach (ICountingStrategy strategy in counter.Count())
{
if (strategy.Count != expectedCount)
{
failures.Add(strategy);
}
}
if (failures.Count == 0)
return null;
var builder = new AssertionFailureBuilder(String.Format(
"Expected the sequence to contain a certain number of elements but {0} counting strateg{1} failed.", failures.Count, failures.Count > 1 ? "ies have" : "y has"))
.AddRawExpectedValue(expectedCount);
foreach (var failure in failures)
{
builder.AddRawLabeledValue(String.Format("Actual Value ({0})", failure.Description), failure.Count);
}
return builder
.SetMessage(messageFormat, messageArgs)
.ToAssertionFailure();
});
}
