/// <summary>Asserts that the given result contains an error grouped by the given key which contains the given substring. Pretty prints the actual errors on assertion failure.</summary>
/// <param name="result">The result under test</param>
/// <param name="expectedKey">The key which should reference a group of error messages in the result</param>
/// <param name="expectedSubString">A portion of an error message which should be keyed by the given key</param>
protected void AssertSomeDataError(ValidationStatus result, string expectedKey, string expectedSubString)
{
Assert.AreEqual(OverallStatus.DataError, result.Disposition);
Assert.IsTrue(result.MessagesFor(expectedKey)
.Any(message => message.Contains(expectedSubString)),
$"Expected error containing { expectedSubString } not found. "
+ AllErrorsPrettyPrinted(result));
}
