/// <summary>
/// Tests whether the action result is <see cref="Microsoft.AspNetCore.Mvc.SignInResult"/>
/// with the same claims principal and authentication scheme as the provided ones.
/// </summary>
/// <typeparam name="TActionResult">Type of the action result.</typeparam>
/// <param name="shouldReturnTestBuilder">Instance of <see cref="IShouldReturnTestBuilder{TActionResult}"/> type.</param>
/// <param name="principal">Expected claims principal.</param>
/// <param name="authenticationScheme">Expected authentication scheme.</param>
/// <returns>Test builder of <see cref="IAndTestBuilder"/> type.</returns>
public static IAndTestBuilder SignIn <TActionResult>(
this IShouldReturnTestBuilder <TActionResult> shouldReturnTestBuilder,
ClaimsPrincipal principal,
string authenticationScheme)
=> shouldReturnTestBuilder
.SignIn(result => result
.WithPrincipal(principal)
.WithAuthenticationScheme(authenticationScheme));