XUnit Test for ViewComponent returns null result? - asp.net-core-mvc

Question

I am trying to test my ViewComponent with XUnit.
When I debug through the component and set a break point right before it returns the Component View, the model is set.
Here is the simple model I am returning.
public class IntDashMakeRecAssgnmntsPoRespMngrVM
{
public IEnumerable<Audit> Audits { get; set; }
}
And I am trying to assert the Audits.Count() is greater than 0.
Here is my View Component:
public class IntDashMakeRecAssgnmntsPoRespMngrViewComponent : ViewComponent
{
private IAuditRepository _auditRepo;
private IExternalRepository _externalRepo;
public IntDashMakeRecAssgnmntsPoRespMngrViewComponent(IAuditRepository auditRepo,
IExternalRepository externalRepo)
{
_auditRepo = auditRepo;
_externalRepo = externalRepo;
}
public IViewComponentResult Invoke()
{
ClaimsPrincipal user = HttpContext.Request.HttpContext.User;
short staffId = short.Parse(user.Claims.Single(c => c.Type == "StaffId").Value);
// Get all Internal Audits that are not closed and not completed
var audits = _auditRepo.Audits
.Include(a => a.Findings).ThenInclude(f => f.Recommendations).ThenInclude(r => r.Assignments)
.Where(a => a.StatusID != 3 && a.StatusID != 11);
var external = _externalRepo.ExternalRecords;
audits = audits.Where(a => !external.Any(e => e.AuditID == a.AuditID));
if (User.IsInRole("PAG_SPEC") && !User.IsInRole("PAG_ADMIN_INT"))
{
audits = audits.Where(a =>
a.Assignments.Any(assn => assn.AssignmentAuditId == a.AuditID
&& assn.AssignmentRoleId == 2 && assn.AssignmentStaffId == staffId));
}
// Where audit has a recommendation without an assigned PO Authorizer
// OR without an assigned Responsible Manager (Rec Level).
List<Audit> auditsToAssign = new List<Audit>();
foreach (Audit audit in audits)
{
foreach (Finding finding in audit.Findings)
{
foreach (Recommendation rec in finding.Recommendations)
{
if (!rec.Assignments.Any(asgn => asgn.AssignmentRoleId == 15)
|| !rec.Assignments.Any(asgn => asgn.AssignmentRoleId == 26)
)
{
auditsToAssign.Add(rec.Finding.Audit);
break;
}
}
}
}
IntDashMakeRecAssgnmntsPoRespMngrVM intDashMakeRecAssgnmntsPoRespMngrVM =
new IntDashMakeRecAssgnmntsPoRespMngrVM
{
Audits = auditsToAssign
};
return View("/Views/InternalAudit/Components/Dashboard/IntDashMakeRecAssgnmntsPoRespMngr/Default.cshtml", intDashMakeRecAssgnmntsPoRespMngrVM);
}
}
When I get to this line in debugging and break to inspect, I have 1 Audit which I want:
return View("/Views/InternalAudit/Components/Dashboard/IntDashMakeRecAssgnmntsPoRespMngr/Default.cshtml", intDashMakeRecAssgnmntsPoRespMngrVM);
Now here is my Unit Test:
[Fact]
public void ReturnsAudit_1Finding_1Rec_1Asgn_PONeeded_RespMnrAssigned()
{
// Arrange
var audits = new Audit[]
{
new Audit { AuditID = 1 }
};
var findings = new Finding[]
{
new Finding{ Audit = audits[0], FindingId = 1 } // 1 Finding
};
var recommendations = new List<Recommendation>()
{
new Recommendation // 1 Rec
{
Finding = findings[0],
Assignments = new List<Assignment>()
{
// PO Authorizor
new Assignment { AssignmentRoleId = 15 }
// No Responsible Manager
}
}
};
audits[0].Findings = findings;
findings[0].Recommendations = recommendations;
Mock<IAuditRepository> mockAuditRepo = new Mock<IAuditRepository>();
mockAuditRepo.Setup(m => m.Audits).Returns(audits.AsQueryable());
Mock<IExternalRepository> mockExternalRepo = new Mock<IExternalRepository>();
mockExternalRepo.Setup(m => m.ExternalRecords).Returns(
new External[0].AsQueryable()
);
// Act
var component = new IntDashMakeRecAssgnmntsPoRespMngrViewComponent(
mockAuditRepo.Object, mockExternalRepo.Object);
component.ViewComponentContext = new ViewComponentContext();
component.ViewComponentContext.ViewContext.HttpContext = TestContext;
var result =
component.Invoke() as IntDashMakeRecAssgnmntsPoRespMngrVM;
int auditCount = (result).Audits.Count();
// Assert
Assert.Equal(1, auditCount);
}
Why is result null on this line?
var result =
component.Invoke() as IntDashMakeRecAssgnmntsPoRespMngrVM;
I also tried this first and it is still null:
ViewComponentResult result =
component.Invoke() as ViewComponentResult;
int auditCount =
((IntDashMakeRecAssgnmntsPoRespMngrVM)result.Model).Audits.Count();

Answer 1

I figured it out.
I wasn't casting the result to the right type.
I had this:
ViewComponentResult result =
component.Invoke() as ViewComponentResult;
int auditCount =
((IntDashMakeRecAssgnmntsPoRespMngrVM)result.Model).Audits.Count();
It should be this:
var result =
component.Invoke() as ViewViewComponentResult;
int auditCount =
((IntDashMakeRecAssgnmntsPoRespMngrVM)result.ViewData.Model).Audits.Count();
ViewViewComponentResult instead of ViewComponentResult.