fixes CNVS-26207
- decaying average now provides a score for a single outcome result
- n_mastery now supports n==1
Test plan:
1. As a teacher, add an outcome with type decaying average
2. Associate a new rubric with the outcome
3. Attach the rubric to a new assignment
4. As a student, complete the assignment
5. As a teacher, grade the assignment, including a passing score
in the rubric
6. View the learning mastery gradebook
7. Verify that the student's single result is reflected in LMG
8. Repeat steps 3-6 with this rubric.
9. Verify that the mastery score average is updated appropriately
10. As a teacher, add an outcome with type n_mastery and n==1
11. Repeat steps 2-9 with this new outcome
Change-Id: I1d3d833997252cbdc273304a7cb971eaf37edfe5
Reviewed-on: https://gerrit.instructure.com/70212
Tested-by: Jenkins
Reviewed-by: John Corrigan <jcorrigan@instructure.com>
Reviewed-by: Matt Berns <mberns@instructure.com>
QA-Review: Deepeeca Soundarrajan <dsoundarrajan@instructure.com>
Product-Review: McCall Smith <mcsmith@instructure.com>
772090f45d