/// <summary>
/// Asserts that a string starts exactly with the specified <paramref name="expected"/> value,
/// including the casing and any leading or trailing whitespace.
/// </summary>
/// <param name="expected">The string that the subject is expected to start with.</param>
/// <param name="because">
/// A formatted phrase as is supported by <see cref="string.Format(string,object[])" /> explaining why the assertion
/// is needed. If the phrase does not start with the word <i>because</i>, it is prepended automatically.
/// </param>
/// <param name="becauseArgs">
/// Zero or more objects to format using the placeholders in <see cref="because" />.
/// </param>
public AndConstraint <StringAssertions> StartWith(string expected, string because = "", params object[] becauseArgs)
{
Guard.ThrowIfArgumentIsNull(expected, nameof(expected), "Cannot compare start of string with <null>.");
if (expected.Length == 0)
{
throw new ArgumentException("Cannot compare start of string with empty string.", nameof(expected));
}
var stringStartValidator = new StringStartValidator(Subject, expected, StringComparison.CurrentCulture, because, becauseArgs);
stringStartValidator.Validate();
return(new AndConstraint <StringAssertions>(this));
}
/// <summary>
/// Asserts that a string starts with the specified <paramref name="expected"/>,
/// including any leading or trailing whitespace, with the exception of the casing.
/// </summary>
/// <param name="expected">The string that the subject is expected to start with.</param>
/// <param name="because">
/// A formatted phrase as is supported by <see cref="string.Format(string,object[])" /> explaining why the assertion
/// is needed. If the phrase does not start with the word <i>because</i>, it is prepended automatically.
/// </param>
/// <param name="becauseArgs">
/// Zero or more objects to format using the placeholders in <see cref="because" />.
/// </param>
public AndConstraint <StringAssertions> StartWithEquivalent(string expected, string because = "",
params object[] becauseArgs)
{
if (expected == null)
{
throw new ArgumentNullException(nameof(expected), "Cannot compare string start equivalence with <null>.");
}
if (expected.Length == 0)
{
throw new ArgumentException("Cannot compare string start equivalence with empty string.", nameof(expected));
}
var stringStartValidator = new StringStartValidator(Subject, expected, StringComparison.CurrentCultureIgnoreCase, because, becauseArgs);
stringStartValidator.Validate();
return(new AndConstraint <StringAssertions>(this));
}