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40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
from django.db.models.functions import Lag, Lead, NthValue, Ntile
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from django.test import SimpleTestCase
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class ValidationTests(SimpleTestCase):
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def test_nth_negative_nth_value(self):
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msg = 'NthValue requires a positive integer as for nth'
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with self.assertRaisesMessage(ValueError, msg):
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NthValue(expression='salary', nth=-1)
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def test_nth_null_expression(self):
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msg = 'NthValue requires a non-null source expression'
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with self.assertRaisesMessage(ValueError, msg):
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NthValue(expression=None)
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def test_lag_negative_offset(self):
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msg = 'Lag requires a positive integer for the offset'
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with self.assertRaisesMessage(ValueError, msg):
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Lag(expression='salary', offset=-1)
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def test_lead_negative_offset(self):
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msg = 'Lead requires a positive integer for the offset'
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with self.assertRaisesMessage(ValueError, msg):
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Lead(expression='salary', offset=-1)
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def test_null_source_lead(self):
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msg = 'Lead requires a non-null source expression'
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with self.assertRaisesMessage(ValueError, msg):
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Lead(expression=None)
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def test_null_source_lag(self):
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msg = 'Lag requires a non-null source expression'
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with self.assertRaisesMessage(ValueError, msg):
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Lag(expression=None)
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def test_negative_num_buckets_ntile(self):
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msg = 'num_buckets must be greater than 0'
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with self.assertRaisesMessage(ValueError, msg):
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Ntile(num_buckets=-1)
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