added test case for fetch children

Author: jaimin001

backend/family_tree/student/schema.py

@@ -11,14 +11,14 @@ class Meta:
 
 class Query(graphene.ObjectType):
     students=graphene.List(StudentType)
-    children=graphene.List(StudentType, parent_id=graphene.String())
+    children=graphene.List(StudentType, parentId=graphene.String())
     student_path= graphene.List(StudentType, roll=graphene.String())
 
     def resolve_students(root,info):
         return Student.objects.all()
 
-    def resolve_children(parent_id):
-        return Student.objects.filter(parentId=parent_id)
+    def resolve_children(root, info, parentId):
+        return Student.objects.filter(parentId=parentId)
 
     def resolve_student_path(root, info, roll):
         pathObjects=[]

backend/family_tree/student/tests.py

@@ -1,3 +1,28 @@
 from django.test import TestCase
+from graphene_django.utils.testing import GraphQLTestCase
+import json
+from student.models import Student
+from mixer.backend.django import mixer
 
-# Create your tests here.
+
+class StudentTestCases(GraphQLTestCase):
+    GRAPHQL_URL = 'http://localhost/graphql'
+    def setUp(self):
+      super().setUp()
+      self.student1 = mixer.blend(Student, roll_no="B20AI014", parentId="B20AI100", name="Jaimin")
+      self.student2 = mixer.blend(Student, roll_no="B20AI100")
+      student2_roll_no = self.student2.roll_no
+
+    def test_children_query(self):
+        response = self.query( '''
+            query {
+                children(parentId: "B20AI100"){
+                    rollNo
+                    name
+                  }
+                }
+              ''' )
+            
+        content = json.loads(response.content)
+        self.assertResponseNoErrors(response)
+        self.assertDictEqual(content['data']['children'][0], {'rollNo': 'B20AI014', 'name': 'Jaimin'})