Added test case

erpnext/schools/doctype/assessment_result/assessment_result.py

@@ -22,4 +22,3 @@ class AssessmentResult(Document):
 				d.grade = get_grade(self.grading_scale, (flt(d.score)/d.maximum_score)*100)
 				self.total_score += d.score
 		self.grade = get_grade(self.grading_scale, (self.total_score/self.maximum_score)*100)
-	

erpnext/schools/doctype/assessment_result/test_assessment_result.py

@@ -5,8 +5,15 @@ from __future__ import unicode_literals
 
 import frappe
 import unittest
+from erpnext.schools.api import get_grade
 
 # test_records = frappe.get_test_records('Assessment Result')
 
 class TestAssessmentResult(unittest.TestCase):
-	pass
+	def test_grade(self):
+		grade = get_grade("_Test Grading Scale", 80)
+		self.assertEquals("A", grade)
+
+		grade = get_grade("_Test Grading Scale", 70)
+		self.assertEquals("B", grade)
+		

erpnext/schools/doctype/evaluation_criteria/test_records.json

@@ -0,0 +1,8 @@
+[
+ {
+  "evaluation_criteria": "_Test Evaluation Criteria"
+ }, 
+ {
+  "evaluation_criteria": "_Test Evaluation Criteria 1"
+ }
+]

erpnext/schools/doctype/grading_scale/test_records.json

@@ -0,0 +1,15 @@
+[
+ {
+  "grading_scale_name": "_Test Grading Scale",
+  "intervals": [
+      {
+         "grade_code": "A",
+         "threshold": 75
+      },
+      {
+          "grade_code": "B",
+          "threshold": 50
+      }
+  ]
+ }
+]