/// <summary>
/// Asserts the specified test method throws an <see cref="ArgumentException">argument exception</see>.
/// </summary>
/// <typeparam name="TException">The <see cref="Type">type</see> of <see cref="ArgumentException"/> to expect.</typeparam>
/// <param name="assert">The extended <see cref="Asserter"/>.</param>
/// <param name="testMethod">The <see cref="Action"/> representing the test method.</param>
/// <param name="paramName">The name of the parameter expected to throw an exception.</param>
/// <param name="message">A message to display if the assertion fails. This message can be seen in the unit test results.</param>
/// <param name="parameters">An array of parameters to use when formatting <paramref name="message" />.</param>
/// <returns>The <see cref="ExceptionAsserter{T}">asserted exception</see>.</returns>
/// <include file="examples.xml" path="Types/Type[@name='ExceptionExtensions']/Member[@name='ThrowsForArgument`1']/example[2]" />
public static ExceptionAsserter <TException> ThrowsForArgument <TException>(this Asserter assert, Action testMethod, string paramName, string message, params object[] parameters) where TException : ArgumentException
{
Arg.NotNull(assert, nameof(assert));
Contract.Ensures(Contract.Result <ExceptionAsserter <TException> >() != null);
assert.AssertParameterIsNotNull(testMethod, nameof(testMethod));
var assertion = assert.Throws <TException>(testMethod, message, parameters);
var actualParam = assertion.Exception.ParamName;
assert.AreEqual(paramName, actualParam, WrongParameterName, paramName, actualParam);
return(assertion);
}
static ExceptionAsserter <TException> ThrowsIfArgumentIs <TArg, TException>(this Asserter assert, Expression <Action <TArg> > testMethod, TArg value, string message, params object[] parameters) where TException : ArgumentException
{
Arg.NotNull(assert, nameof(assert));
Arg.NotNull(assert, nameof(testMethod));
Contract.Ensures(Contract.Result <ExceptionAsserter <TException> >() != null);
assert.AssertParameterIsNotNull(testMethod, nameof(testMethod));
var test = testMethod.Compile();
var assertion = assert.Throws <TException>(() => test(value), message, parameters);
var expectedParam = testMethod.Parameters.First().Name;
var actualParam = assertion.Exception.ParamName;
assert.AreEqual(expectedParam, actualParam, WrongParameterName, expectedParam, actualParam);
return(assertion);
}
/// <summary>
/// Asserts the specified test method throws an exception of the specified type.
/// </summary>
/// <typeparam name="TException">The <see cref="Type"/> of <see cref="ArgumentException"/> that should be thrown.</typeparam>
/// <param name="assert">The extended <see cref="Asserter"/>.</param>
/// <param name="testMethod">The <see cref="Action"/> representing the test method.</param>
/// <returns>The <see cref="ExceptionAsserter{T}">asserted exception</see>.</returns>
/// <include file="examples.xml" path="Types/Type[@name='ExceptionExtensions']/Member[@name='Throws`1']/example[1]" />
public static ExceptionAsserter <TException> Throws <TException>(this Asserter assert, Action testMethod) where TException : Exception =>
assert.Throws <TException>(testMethod, ExceptionOfTNotThrown, typeof(TException));
/// <summary>
/// Asserts the specified test method throws an exception of any type.
/// </summary>
/// <param name="assert">The extended <see cref="Asserter"/>.</param>
/// <param name="testMethod">The <see cref="Action"/> representing the test method.</param>
/// <returns>The <see cref="ExceptionAsserter{T}">asserted exception</see>.</returns>
/// <include file="examples.xml" path="Types/Type[@name='ExceptionExtensions']/Member[@name='Throws']/example[1]" />
public static ExceptionAsserter <Exception> Throws(this Asserter assert, Action testMethod) => assert.Throws(testMethod, ExceptionNotThrown);