public void Apply_Changes_Should_Mark_Unchanged_Employee_As_Unchanged_And_Unchanged_Territories_With_Modified_Area_As_Modified()
{
// Ensure that changes are applied across M-M relationships.
// Arrange
var context = TestsHelper.CreateNorthwindDbContext(CreateNorthwindDbOptions);
var nw = new MockNorthwind();
var employee = nw.Employees[0];
var territory1 = employee.Territories[0];
var territory2 = employee.Territories[1];
var territory3 = employee.Territories[2];
var area = new Area
{
AreaId = 1,
AreaName = "Northern",
TrackingState = TrackingState.Modified
};
territory3.AreaId = 1;
territory3.Area = area;
// Act
context.ApplyChanges(employee);
// Assert
Assert.AreEqual(EntityState.Unchanged, context.Entry(employee).State);
Assert.AreEqual(EntityState.Unchanged, context.Entry(territory1).State);
Assert.AreEqual(EntityState.Unchanged, context.Entry(territory2).State);
Assert.AreEqual(EntityState.Unchanged, context.Entry(territory3).State);
Assert.AreEqual(EntityState.Modified, context.Entry(area).State);
}
private List<Employee> CreateTestEmployees(NorthwindDbContext context)
{
// Create test entities
var area1 = new Area { AreaName = "Northern" };
var area2 = new Area { AreaName = "Southern" };
var territory1 = context.Territories.Single(t => t.TerritoryId == TestTerritoryId1);
var territory2 = context.Territories.Single(t => t.TerritoryId == TestTerritoryId2);
var territory3 = context.Territories.Single(t => t.TerritoryId == TestTerritoryId3);
territory1.Area = area1;
territory2.Area = area2;
territory3.Area = area2;
var employee1 = new Employee
{
FirstName = "Test",
LastName = "Employee1",
City = "San Fransicso",
Country = "USA",
Territories = new List<Territory> { territory1, territory2 }
};
var employee2 = new Employee
{
FirstName = "Test",
LastName = "Employee2",
City = "Sacramento",
Country = "USA",
Territories = new List<Territory> { territory2, territory3 }
};
// Persist entities
context.Employees.Add(employee1);
context.Employees.Add(employee2);
context.SaveChanges();
// Detach entities
var objContext = ((IObjectContextAdapter)context).ObjectContext;
objContext.Detach(employee1);
objContext.Detach(employee2);
// Clear reference properties
territory1.Area = null;
territory2.Area = null;
territory3.Area = null;
employee1.Territories = new List<Territory> { territory1, territory2 };
employee2.Territories = new List<Territory> { territory2, territory3 };
// Return employees
return new List<Employee> { employee1, employee2 };
}