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from test import TestCase, generate_random_vector, fill_redis_with_vectors
import struct
class VRANDMEMBERTest(TestCase):
def getname(self):
return "VRANDMEMBER basic functionality"
def test(self):
# Test with empty key
result = self.redis.execute_command('VRANDMEMBER', self.test_key)
assert result is None, "VRANDMEMBER on non-existent key should return NULL"
result = self.redis.execute_command('VRANDMEMBER', self.test_key, 5)
assert isinstance(result, list) and len(result) == 0, "VRANDMEMBER with count on non-existent key should return empty array"
# Fill with vectors
dim = 4
count = 100
data = fill_redis_with_vectors(self.redis, self.test_key, count, dim)
# Test single random member
result = self.redis.execute_command('VRANDMEMBER', self.test_key)
assert result is not None, "VRANDMEMBER should return a random member"
assert result.decode() in data.names, "Random member should be in the set"
# Test multiple unique members (positive count)
positive_count = 10
result = self.redis.execute_command('VRANDMEMBER', self.test_key, positive_count)
assert isinstance(result, list), "VRANDMEMBER with positive count should return an array"
assert len(result) == positive_count, f"Should return {positive_count} members"
# Check for uniqueness
decoded_results = [r.decode() for r in result]
assert len(decoded_results) == len(set(decoded_results)), "Results should be unique with positive count"
for item in decoded_results:
assert item in data.names, "All returned items should be in the set"
# Test more members than in the set
result = self.redis.execute_command('VRANDMEMBER', self.test_key, count + 10)
assert len(result) == count, "Should return only the available members when asking for more than exist"
# Test with duplicates (negative count)
negative_count = -20
result = self.redis.execute_command('VRANDMEMBER', self.test_key, negative_count)
assert isinstance(result, list), "VRANDMEMBER with negative count should return an array"
assert len(result) == abs(negative_count), f"Should return {abs(negative_count)} members"
# Check that all returned elements are valid
decoded_results = [r.decode() for r in result]
for item in decoded_results:
assert item in data.names, "All returned items should be in the set"
# Test with count = 0 (edge case)
result = self.redis.execute_command('VRANDMEMBER', self.test_key, 0)
assert isinstance(result, list) and len(result) == 0, "VRANDMEMBER with count=0 should return empty array"