94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
from uuid import uuid4
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from cqlengine import Model
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from cqlengine import columns
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from cqlengine.management import create_table, delete_table
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from cqlengine.models import ModelDefinitionException
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from cqlengine.tests.base import BaseCassEngTestCase
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class TestCounterModel(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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cluster = columns.UUID(primary_key=True, default=uuid4)
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counter = columns.Counter()
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class TestClassConstruction(BaseCassEngTestCase):
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def test_defining_a_non_counter_column_fails(self):
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""" Tests that defining a non counter column field in a model with a counter column fails """
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with self.assertRaises(ModelDefinitionException):
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class model(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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counter = columns.Counter()
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text = columns.Text()
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def test_defining_a_primary_key_counter_column_fails(self):
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""" Tests that defining primary keys on counter columns fails """
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with self.assertRaises(TypeError):
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class model(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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cluster = columns.Counter(primary_ley=True)
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counter = columns.Counter()
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# force it
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with self.assertRaises(ModelDefinitionException):
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class model(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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cluster = columns.Counter()
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cluster.primary_key = True
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counter = columns.Counter()
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class TestCounterColumn(BaseCassEngTestCase):
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@classmethod
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def setUpClass(cls):
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super(TestCounterColumn, cls).setUpClass()
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delete_table(TestCounterModel)
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create_table(TestCounterModel)
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@classmethod
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def tearDownClass(cls):
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super(TestCounterColumn, cls).tearDownClass()
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delete_table(TestCounterModel)
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def test_updates(self):
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""" Tests that counter updates work as intended """
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instance = TestCounterModel.create()
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instance.counter += 5
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instance.save()
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actual = TestCounterModel.get(partition=instance.partition)
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assert actual.counter == 5
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def test_concurrent_updates(self):
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""" Tests updates from multiple queries reaches the correct value """
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instance = TestCounterModel.create()
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new1 = TestCounterModel.get(partition=instance.partition)
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new2 = TestCounterModel.get(partition=instance.partition)
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new1.counter += 5
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new1.save()
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new2.counter += 5
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new2.save()
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actual = TestCounterModel.get(partition=instance.partition)
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assert actual.counter == 10
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def test_update_from_none(self):
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""" Tests that updating from None uses a create statement """
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instance = TestCounterModel()
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instance.counter += 1
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instance.save()
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new = TestCounterModel.get(partition=instance.partition)
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assert new.counter == 1
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def test_new_instance_defaults_to_zero(self):
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""" Tests that instantiating a new model instance will set the counter column to zero """
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instance = TestCounterModel()
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assert instance.counter == 0
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