passing canvas models tests

Management/Features/Calendar/SemesterPlanner.cs

@@ -1,4 +1,13 @@
+using CanvasModel.EnrollmentTerms;
+
 public class SemesterPlanner
 {
-  
+  public IEnumerable<CalendarMonth> Months { get; }
+  public SemesterPlanner(EnrollmentTermModel canvasTerm)
+  {
+    var monthsInTerm = canvasTerm.EndAt?.Month - canvasTerm.StartAt?.Month
+      ?? throw new Exception($"Canvas Term must have a start and end date. Term: {canvasTerm.Id}, start: {canvasTerm.StartAt}, end: {canvasTerm.EndAt}");
+
+    Months = Enumerable.Range(1, monthsInTerm).Select(_ => new CalendarMonth());
+  }
 }