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"""Tests the python routines within AM09."""
from types import SimpleNamespace
import sqlfluff
from sqlfluff.rules.ambiguous.AM09 import Rule_AM09
def test__rules__std_AM09_missing_order_by() -> None:
"""Test case for LIMIT and OFFSET without ORDER BY."""
sql = """
SELECT *
FROM foo
LIMIT 10 OFFSET 5;
"""
result = sqlfluff.lint(sql)
results_AM09 = [r for r in result if r["code"] == "AM09"]
assert len(results_AM09) == 1
assert results_AM09[0]["description"] == (
"LIMIT and OFFSET are used without ORDER BY,"
" which may lead to non-deterministic results."
)
def test__rules__std_AM09_with_order_by() -> None:
"""Test case for LIMIT and OFFSET with ORDER BY."""
sql = """
SELECT *
FROM foo
ORDER BY id
LIMIT 10 OFFSET 5;
"""
result = sqlfluff.lint(sql)
results_AM09 = [r for r in result if r["code"] == "AM09"]
assert len(results_AM09) == 0
def test__rules__std_AM09_no_limit_or_offset() -> None:
"""Test case for query without LIMIT or OFFSET."""
sql = """
SELECT *
FROM foo;
"""
result = sqlfluff.lint(sql)
results_AM09 = [r for r in result if r["code"] == "AM09"]
assert len(results_AM09) == 0
def test__rules__std_AM09_non_select_statement_integration() -> None:
"""Integration-style lint: non-SELECT statements should not flag AM09."""
sql = """
CREATE TABLE foo (id INT, name TEXT);
"""
result = sqlfluff.lint(sql)
# Ensure no AM09 violations are reported
results_AM09 = [r for r in result if r["code"] == "AM09"]
assert len(results_AM09) == 0
def test__rules__std_AM09_eval_short_circuit_on_non_select_segment() -> None:
"""Directly cover the guard that returns None for non-SELECT segments."""
class FakeSegment:
def is_type(self, _type: str) -> bool:
return False # not a select_statement
fake_context = SimpleNamespace(segment=FakeSegment())
# Bypass BaseRule.__init__ (which requires code/description).
rule = Rule_AM09.__new__(Rule_AM09)
assert rule._eval(fake_context) is None
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