public void DetailsController_RegionDetails_IsNotNull()
{
// Arrange
var regionInfo = new RegionDetails()
{
Name = "TestRegion"
};
_mediator.Setup(s => s.GetRegionDetails("TestRegion")).ReturnsAsync(regionInfo);
var controller = new DetailsController(_mediator.Object);
// Act
var result = controller.RegionDetails("TestRegion").Result;
// Assert
result.Should().NotBeNull();
}