MockWorkItem.Fields cannot be enumerated if initialzed with a constructor which takes field values

[pelavall]

When constructing MockWorkItem() and passing values for a field collection they are ultimately used in setting the private variable _fields on WorkItemCore which is the bases for retrieving fields via indexing. However the variable _fields in WorkItemCore is distinct from the _fields variable in Workitem, which backs the Fields property. In effect, MockWorkItem() enables initializing a workitem with retrievable values via workitem["property"] but not workitem.Fields["property"].Value, nor enumerating the values of the workitem.Fields property.

[pelavall]

A work around for this is to set the desired values one at a time either using an object an initializer or setting the values one at a time after an initialization.

var workItem = new MockWorkItem(new MockWorkItemType("Bug"))
{
    ["Commit Available Branch"] = "a",
    ["Commit Available Build"] = "b",
    ["Current Release Build"] = "c",
    ["Current Flighting Build"] = "d",
    ["Resolved Reason"] = "e",
    ["Release"] = string.Empty,
    ["Product"] = string.Empty,
    ["Triage"] = string.Empty,
    ["Tags"] = string.Empty,
    ["Blocking"] = string.Empty
};