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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Reactive.Disposables;
using System.Reactive.Linq;
#if NUNIT
using NUnit.Framework;
#elif WINDOWS8
using Microsoft.VisualStudio.TestPlatform.UnitTestFramework;
#else
using Microsoft.VisualStudio.TestTools.UnitTesting;
#endif
namespace Microsoft.Reactive.Testing
{
/// <summary>
/// Helper class to write asserts in unit tests for applications and libraries built using Reactive Extensions.
/// </summary>
public static class ReactiveAssert
{
static string Message<T>(IEnumerable<T> actual, IEnumerable<T> expected)
{
var sb = new StringBuilder();
sb.AppendLine();
sb.Append("Expected: [");
sb.Append(string.Join(", ", expected.Select(x => x.ToString()).ToArray()));
sb.Append("]");
sb.AppendLine();
sb.Append("Actual..: [");
sb.Append(string.Join(", ", actual.Select(x => x.ToString()).ToArray()));
sb.Append("]");
sb.AppendLine();
return sb.ToString();
}
/// <summary>
/// Asserts that both enumerable sequences have equal length and equal elements.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="expected">Expected sequence.</param>
/// <param name="actual">Actual sequence to compare against the expected one.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AreElementsEqual<T>(IEnumerable<T> expected, IEnumerable<T> actual)
{
if (expected == null)
throw new ArgumentNullException("expected");
if (actual == null)
throw new ArgumentNullException("actual");
if (!expected.SequenceEqual(actual))
Assert.Fail(Message(actual, expected));
}
/// <summary>
/// Asserts that both enumerable sequences have equal length and equal elements.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="expected">Expected sequence.</param>
/// <param name="actual">Actual sequence to compare against the expected one.</param>
/// <param name="message">Error message for assert failure.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AreElementsEqual<T>(IEnumerable<T> expected, IEnumerable<T> actual, string message)
{
if (expected == null)
throw new ArgumentNullException("expected");
if (actual == null)
throw new ArgumentNullException("actual");
if (!expected.SequenceEqual(actual))
Assert.Fail(message);
}
/// <summary>
/// Asserts that both observable sequences have equal length and equal notifications.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="expected">Expected sequence.</param>
/// <param name="actual">Actual sequence to compare against the expected one.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AreElementsEqual<T>(IObservable<T> expected, IObservable<T> actual)
{
if (expected == null)
throw new ArgumentNullException("expected");
if (actual == null)
throw new ArgumentNullException("actual");
AreElementsEqual(expected.Materialize().ToEnumerable(), actual.Materialize().ToEnumerable());
}
/// <summary>
/// Asserts that both observable sequences have equal length and equal elements.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="expected">Expected sequence.</param>
/// <param name="actual">Actual sequence to compare against the expected one.</param>
/// <param name="message">Error message for assert failure.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AreElementsEqual<T>(IObservable<T> expected, IObservable<T> actual, string message)
{
if (expected == null)
throw new ArgumentNullException("expected");
if (actual == null)
throw new ArgumentNullException("actual");
AreElementsEqual(expected.Materialize().ToEnumerable(), actual.Materialize().ToEnumerable(), message);
}
/// <summary>
/// Asserts that the given action throws an exception of the type specified in the generic parameter, or a subtype thereof.
/// </summary>
/// <typeparam name="TException">Type of the exception to check for.</typeparam>
/// <param name="action">Action to run.</param>
/// <exception cref="ArgumentNullException"><paramref name="action"/> is null.</exception>
public static void Throws<TException>(Action action) where TException : Exception
{
if (action == null)
throw new ArgumentNullException("action");
var failed = false;
try
{
action();
failed = true;
}
catch (TException)
{
}
catch (Exception ex)
{
Assert.Fail(string.Format(CultureInfo.CurrentCulture, "Expected {0} threw {1}.\r\n\r\nStack trace:\r\n{2}", typeof(TException).Name, ex.GetType().Name, ex.StackTrace));
}
if (failed)
Assert.Fail(string.Format(CultureInfo.CurrentCulture, "Expected {0}.", typeof(TException).Name));
}
/// <summary>
/// Asserts that the given action throws an exception of the type specified in the generic parameter, or a subtype thereof.
/// </summary>
/// <typeparam name="TException">Type of the exception to check for.</typeparam>
/// <param name="action">Action to run.</param>
/// <param name="message">Error message for assert failure.</param>
/// <exception cref="ArgumentNullException"><paramref name="action"/> is null.</exception>
public static void Throws<TException>(Action action, string message) where TException : Exception
{
if (action == null)
throw new ArgumentNullException("action");
var failed = false;
try
{
action();
failed = true;
}
catch (TException)
{
}
catch
{
Assert.Fail(message);
}
if (failed)
Assert.Fail(message);
}
/// <summary>
/// Asserts that the given action throws the specified exception.
/// </summary>
/// <typeparam name="TException">Type of the exception to check for.</typeparam>
/// <param name="exception">Exception to assert being thrown.</param>
/// <param name="action">Action to run.</param>
/// <exception cref="ArgumentNullException"><paramref name="action"/> is null.</exception>
public static void Throws<TException>(TException exception, Action action) where TException : Exception
{
if (action == null)
throw new ArgumentNullException("action");
var failed = false;
try
{
action();
failed = true;
}
catch (TException ex)
{
Assert.AreSame(exception, ex);
}
catch (Exception ex)
{
Assert.Fail(string.Format(CultureInfo.CurrentCulture, "Expected {0} threw {1}.\r\n\r\nStack trace:\r\n{2}", typeof(TException).Name, ex.GetType().Name, ex.StackTrace));
}
if (failed)
Assert.Fail(string.Format(CultureInfo.CurrentCulture, "Expected {0}.", typeof(TException).Name));
}
/// <summary>
/// Asserts that the given action throws the specified exception.
/// </summary>
/// <typeparam name="TException">Type of the exception to check for.</typeparam>
/// <param name="exception">Exception to assert being thrown.</param>
/// <param name="action">Action to run.</param>
/// <param name="message">Error message for assert failure.</param>
/// <exception cref="ArgumentNullException"><paramref name="action"/> is null.</exception>
public static void Throws<TException>(TException exception, Action action, string message) where TException : Exception
{
if (action == null)
throw new ArgumentNullException("action");
var failed = false;
try
{
action();
failed = true;
}
catch (TException ex)
{
Assert.AreSame(exception, ex);
}
catch
{
Assert.Fail(message);
}
if (failed)
Assert.Fail(message);
}
/// <summary>
/// Asserts that both enumerable sequences have equal length and equal elements.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="actual">Actual sequence to compare against the expected one.</param>
/// <param name="expected">Expected sequence.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AssertEqual<T>(this IEnumerable<T> actual, IEnumerable<T> expected)
{
if (actual == null)
throw new ArgumentNullException("actual");
if (expected == null)
throw new ArgumentNullException("expected");
ReactiveAssert.AreElementsEqual(expected, actual);
}
/// <summary>
/// Asserts the enumerable sequence has the expected elements.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="actual">Actual sequence to compare against the expected elements.</param>
/// <param name="expected">Expected elements.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AssertEqual<T>(this IEnumerable<T> actual, params T[] expected)
{
if (actual == null)
throw new ArgumentNullException("actual");
if (expected == null)
throw new ArgumentNullException("expected");
ReactiveAssert.AreElementsEqual(expected, actual);
}
/// <summary>
/// Asserts that both observable sequences have equal length and equal notifications.
/// </summary>
/// <typeparam name="T">The type of the elements in the sequence.</typeparam>
/// <param name="actual">Actual sequence to compare against the expected one.</param>
/// <param name="expected">Expected sequence.</param>
/// <exception cref="ArgumentNullException"><paramref name="expected"/> or <paramref name="actual"/> is null.</exception>
public static void AssertEqual<T>(this IObservable<T> actual, IObservable<T> expected)
{
if (actual == null)
throw new ArgumentNullException("actual");
if (expected == null)
throw new ArgumentNullException("expected");
ReactiveAssert.AreElementsEqual(expected, actual);
}
}
}
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