TransactionManagementError “You can”t execute queries until the end of the “atomic” block” while using signals, but only during Unit Testing

I am getting TransactionManagementError when trying to save a Django User model instance and in its post_save signal, I"m saving some models that have the user as the foreign key.

The context and error is pretty similar to this question django TransactionManagementError when using signals

However, in this case, the error occurs only while unit testing.

It works well in manual testing, but unit tests fails.

Is there anything that I"m missing?

Here are the code snippets:

views.py

@csrf_exempt
def mobileRegister(request):
    if request.method == "GET":
        response = {"error": "GET request not accepted!!"}
        return HttpResponse(json.dumps(response), content_type="application/json",status=500)
    elif request.method == "POST":
        postdata = json.loads(request.body)
        try:
            # Get POST data which is to be used to save the user
            username = postdata.get("phone")
            password = postdata.get("password")
            email = postdata.get("email","")
            first_name = postdata.get("first_name","")
            last_name = postdata.get("last_name","")
            user = User(username=username, email=email,
                        first_name=first_name, last_name=last_name)
            user._company = postdata.get("company",None)
            user._country_code = postdata.get("country_code","+91")
            user.is_verified=True
            user._gcm_reg_id = postdata.get("reg_id",None)
            user._gcm_device_id = postdata.get("device_id",None)
            # Set Password for the user
            user.set_password(password)
            # Save the user
            user.save()

signal.py

def create_user_profile(sender, instance, created, **kwargs):
    if created:
        company = None
        companycontact = None
        try:   # Try to make userprofile with company and country code provided
            user = User.objects.get(id=instance.id)
            rand_pass = random.randint(1000, 9999)
            company = Company.objects.get_or_create(name=instance._company,user=user)
            companycontact = CompanyContact.objects.get_or_create(contact_type="Owner",company=company,contact_number=instance.username)
            profile = UserProfile.objects.get_or_create(user=instance,phone=instance.username,verification_code=rand_pass,company=company,country_code=instance._country_code)
            gcmDevice = GCMDevice.objects.create(registration_id=instance._gcm_reg_id,device_id=instance._gcm_reg_id,user=instance)
        except Exception, e:
            pass

tests.py

class AuthTestCase(TestCase):
    fixtures = ["nextgencatalogs/fixtures.json"]
    def setUp(self):
        self.user_data={
            "phone":"0000000000",
            "password":"123",
            "first_name":"Gaurav",
            "last_name":"Toshniwal"
            }

    def test_registration_api_get(self):
        response = self.client.get("/mobileRegister/")
        self.assertEqual(response.status_code,500)

    def test_registration_api_post(self):
        response = self.client.post(path="/mobileRegister/",
                                    data=json.dumps(self.user_data),
                                    content_type="application/json")
        self.assertEqual(response.status_code,201)
        self.user_data["username"]=self.user_data["phone"]
        user = User.objects.get(username=self.user_data["username"])
        # Check if the company was created
        company = Company.objects.get(user__username=self.user_data["phone"])
        self.assertIsInstance(company,Company)
        # Check if the owner"s contact is the same as the user"s phone number
        company_contact = CompanyContact.objects.get(company=company,contact_type="owner")
        self.assertEqual(user.username,company_contact[0].contact_number)

Traceback:

======================================================================
ERROR: test_registration_api_post (nextgencatalogs.apps.catalogsapp.tests.AuthTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/nextgencatalogs/apps/catalogsapp/tests.py", line 29, in test_registration_api_post
    user = User.objects.get(username=self.user_data["username"])
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/manager.py", line 151, in get
    return self.get_queryset().get(*args, **kwargs)
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/query.py", line 301, in get
    num = len(clone)
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/query.py", line 77, in __len__
    self._fetch_all()
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/query.py", line 854, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/query.py", line 220, in iterator
    for row in compiler.results_iter():
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 710, in results_iter
    for rows in self.execute_sql(MULTI):
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 781, in execute_sql
    cursor.execute(sql, params)
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/backends/util.py", line 47, in execute
    self.db.validate_no_broken_transaction()
  File "/Users/gauravtoshniwal1989/Developer/Web/Server/ngc/ngcvenv/lib/python2.7/site-packages/django/db/backends/__init__.py", line 365, in validate_no_broken_transaction
    "An error occurred in the current transaction. You can"t "
TransactionManagementError: An error occurred in the current transaction. You can"t execute queries until the end of the "atomic" block.

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TransactionManagementError "You can"t execute queries until the end of the "atomic" block" while using signals, but only during Unit Testing __del__: Questions

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

from time import sleep
sleep(0.1) # Time in seconds

TransactionManagementError "You can"t execute queries until the end of the "atomic" block" while using signals, but only during Unit Testing __del__: Questions