CODEWITHSUNDEEP
pythondjangounit-testingmockingdjango-rest-framework
user4923309
user4923309

Reputation:

Django Rest Framework: Test serializers

In my project coach I have a problem with testing the Information serializer. I have the following serializer classes in the file running/serializes.py:

class Velocity(serializers.ModelSerializer):
    class Meta:
        model = VelocityModel
        fields = ("id", "minimum", "average", "maximum")


class Information(serializers.ModelSerializer):
    heart_beat = HeartBeat(read_only=True)
    velocity = Velocity(read_only=True)

    class Meta:
        model = InformationModel
        fields = ("id", "distance", "velocity", "heart_beat", "calories")

In my test I have this:

from running import models, serializers

@patch("running.serializers.Velocity")
def test_contains_id(self, mock_velocity):
    # mocking stuff
    returned_data = {}
    mock_velocity.data = PropertyMock(return_value=returned_data)

    # creating instances of the models
    self.velocity = models.Velocity(minimum=8, average=10, maximum=12)
    self.velocity.save()
    self.heart_beat = models.HeartBeat(minimum=120, average=130, maximum=140)
    self.heart_beat.save()
    self.information = models.Information(distance=3.7, velocity=self.velocity, heart_beat=self.heart_beat, calories=132)
    self.information.save()

    # create the actual serializer
    self.information_serializer = serializers.Information(self.information)

    self.assertEqual(self.information_serializer.data["velocity"], returned_data)

So I want to test, that the data returned by the InformationSerializer (self.information_serializer.data), has a key "velocity", which points on the data returned by the VelocitySerializer (mock_velocity.data).

But self.information_serializer.data["velocity"] just contains the data, saved in the models (OrderedDict([('id', 1), ('minimum', 8.0), ('average', 10.0), ('maximum', 12.0)]). I don't know where is my fault...

Also another question would be, do I really need to test this? Because I'm questioning myself, if I'm testing more the Django Rest Framework than my serializers?!

So how to go on? Thanks in advance!

Upvotes: 7

Views: 17594

Answers (1)

user6781560
user6781560

Reputation:

Just test your business logic. I know I was testing model serializers myself but in truth we don't need to. Django has tested them already.

Just do an integration test in the view to see that your CRUD operations are working correctly.

Upvotes: 11

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