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alternator-test: add test case for nested read-before-write

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A test for read-before-write in nested paths (inside a function call
or inside a +/- operator) is added.
This commit is contained in:
Piotr Sarna
2019-07-09 11:49:52 +02:00
committed by Nadav Har'El
parent da795d8733
commit 7b605d5bec
1 changed files with 15 additions and 0 deletions
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15
alternator-test/test_update_expression.py
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@@ -54,6 +54,21 @@ def test_update_expression_set_copy(test_table_s):
with pytest.raises(ClientError, match='ValidationException'):
test_table_s.update_item(Key={'p': p}, UpdateExpression='SET z = z')
# Test for read-before-write action where the value to be read is nested inside a - operator
def test_update_expression_set_nested_copy(test_table_s):
p = random_string()
test_table_s.update_item(Key={'p': p}, UpdateExpression='SET #n = :two',
ExpressionAttributeNames={'#n': 'n'}, ExpressionAttributeValues={':two': 2})
test_table_s.update_item(Key={'p': p}, UpdateExpression='SET #nn = :seven - #n',
ExpressionAttributeNames={'#nn': 'nn', '#n': 'n'}, ExpressionAttributeValues={':seven': 7})
assert test_table_s.get_item(Key={'p': p}, ConsistentRead=True)['Item'] == {'p': p, 'n': 2, 'nn': 5}
test_table_s.update_item(Key={'p': p}, UpdateExpression='SET #nnn = :nnn',
ExpressionAttributeNames={'#nnn': 'nnn'}, ExpressionAttributeValues={':nnn': [2,4]})
test_table_s.update_item(Key={'p': p}, UpdateExpression='SET #nnnn = list_append(:val1, #nnn)',
ExpressionAttributeNames={'#nnnn': 'nnnn', '#nnn': 'nnn'}, ExpressionAttributeValues={':val1': [1,3]})
assert test_table_s.get_item(Key={'p': p}, ConsistentRead=True)['Item'] == {'p': p, 'n': 2, 'nn': 5, 'nnn': [2,4], 'nnnn': [1,3,2,4]}
# Simple test for the "REMOVE" action
def test_update_expression_remove(test_table_s):
p = random_string()