public static void ConfigureExceptionHandler(this IApplicationBuilder app)
{
app.UseExceptionHandler(error =>
{
error.Run(async context =>
{
var exceptionHandlerFeature = context.Features.Get <IExceptionHandlerFeature>();
var exception = exceptionHandlerFeature.Error;
var statusCode = exception switch
{
ResourceNotFoundException _ => (int)HttpStatusCode.NotFound,
ModelFormatException _ => (int)HttpStatusCode.PreconditionFailed,
ResourceAlreadyExistsException _ => (int)HttpStatusCode.Conflict,
InvalidLoginException _ => (int)HttpStatusCode.Unauthorized,
UnauthorizedException _ => (int)HttpStatusCode.Unauthorized,
InvalidProductIdentifierException _ => (int)HttpStatusCode.PreconditionFailed,
_ => (int)HttpStatusCode.InternalServerError
};
context.Response.ContentType = "application/json";
context.Response.StatusCode = statusCode;
await context.Response.WriteAsync(new ExceptionModel
{
StatusCode = statusCode,
Message = exception.Message
}.ToString());
});
});
}
public void ConstructorMessageShouldPopulateExceptionMessage()
{
var message = "This is a really interesting message";
var exception = new ResourceAlreadyExistsException(message);
Assert.Equal(message, exception.Message);
}
public void TestResourceAlreadyExistsExceptionReturnsConflictResult()
{
// Arrange
var loggerMock = new Mock <ILogger <ExceptionHandlerFilterAttribute> >();
var logger = loggerMock.Object;
var loggerFactoryMock = new Mock <ILoggerFactory>();
loggerFactoryMock.Setup(
lf => lf.CreateLogger(It.IsAny <String>()))
.Returns(logger);
String exceptionMessage = "The resource already exists";
var exception = new ResourceAlreadyExistsException(exceptionMessage);
var httpContextMock = new Mock <HttpContext>();
var routeData = new RouteData();
var actionDescriptor = new ActionDescriptor();
var actionContext = new ActionContext(httpContextMock.Object, routeData, actionDescriptor);
var exceptionContext = new ExceptionContext(actionContext, new List <IFilterMetadata>());
exceptionContext.Exception = exception;
exceptionContext.ExceptionHandled = false;
// Act
var filter = new ExceptionHandlerFilterAttribute(loggerFactoryMock.Object);
filter.OnException(exceptionContext);
// Assert
Assert.NotNull(exceptionContext.Result);
Assert.IsType <ConflictObjectResult>(exceptionContext.Result);
var resultObject = (ConflictObjectResult)(exceptionContext.Result);
Assert.IsType <ApiMessageModel>(resultObject.Value);
Assert.Equal(exceptionMessage, ((ApiMessageModel)resultObject.Value).Message);
// Commented out because LogWarning is an extension method. Need to figure out how to test
//loggerMock.Verify(l => l.LogWarning(It.IsAny<EventId>(), exception, notFoundMessage), Times.Once);
}