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from astrbot.core.agent.context.truncator import ContextTruncator
from astrbot.core.agent.message import Message
class TestContextTruncator:
"""Test suite for ContextTruncator."""
def create_message(self, role: str, content: str = "test content") -> Message:
"""Helper to create a simple test message."""
return Message(role=role, content=content)
def create_messages(
self, count: int, include_system: bool = False
) -> list[Message]:
"""Helper to create alternating user/assistant messages.
Args:
count: Number of messages to create
include_system: Whether to include a system message at the start
Returns:
List of messages
"""
messages = []
if include_system:
messages.append(self.create_message("system", "System prompt"))
for i in range(count):
role = "user" if i % 2 == 0 else "assistant"
messages.append(self.create_message(role, f"Message {i}"))
return messages
# ==================== fix_messages Tests ====================
def test_fix_messages_empty_list(self):
"""Test fix_messages with an empty list."""
truncator = ContextTruncator()
result = truncator.fix_messages([])
assert result == []
def test_fix_messages_normal_messages(self):
"""Test fix_messages with normal user/assistant messages."""
truncator = ContextTruncator()
messages = [
self.create_message("user", "Hello"),
self.create_message("assistant", "Hi"),
self.create_message("user", "How are you?"),
]
result = truncator.fix_messages(messages)
assert len(result) == 3
assert result == messages
def test_fix_messages_tool_without_context(self):
"""Test fix_messages with tool message without enough context."""
truncator = ContextTruncator()
messages = [
self.create_message("tool", "Tool result"),
]
result = truncator.fix_messages(messages)
# Tool message without context should be removed
assert len(result) == 0
# ==================== truncate_by_turns Tests ====================
def test_truncate_by_turns_no_limit(self):
"""Test truncate_by_turns with -1 (no limit)."""
truncator = ContextTruncator()
messages = self.create_messages(20)
result = truncator.truncate_by_turns(messages, keep_most_recent_turns=-1)
assert len(result) == 20
assert result == messages
def test_truncate_by_turns_basic(self):
"""Test basic truncate_by_turns functionality."""
truncator = ContextTruncator()
# Create 10 messages = 5 turns (user/assistant pairs)
messages = self.create_messages(10)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=3, drop_turns=1
)
# Should keep 3 most recent turns (6 messages)
assert len(result) <= 8 # (3-1+1)*2 = 6, but may adjust for correct format
def test_truncate_by_turns_with_system_message(self):
"""Test truncate_by_turns preserves system messages."""
truncator = ContextTruncator()
messages = self.create_messages(10, include_system=True)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=2, drop_turns=1
)
# System message should always be preserved
assert result[0].role == "system"
assert result[0].content == "System prompt"
def test_truncate_by_turns_zero_keep(self):
"""Test truncate_by_turns with keep_most_recent_turns=0."""
truncator = ContextTruncator()
messages = self.create_messages(10)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=0, drop_turns=1
)
# Should result in empty or minimal list
assert len(result) == 0
def test_truncate_by_turns_below_threshold(self):
"""Test truncate_by_turns when messages are below threshold."""
truncator = ContextTruncator()
# Create 4 messages = 2 turns
messages = self.create_messages(4)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=5, drop_turns=1
)
# No truncation should happen
assert len(result) == 4
assert result == messages
def test_truncate_by_turns_exact_threshold(self):
"""Test truncate_by_turns when messages exactly match threshold."""
truncator = ContextTruncator()
# Create 6 messages = 3 turns
messages = self.create_messages(6)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=3, drop_turns=1
)
# No truncation should happen
assert len(result) == 6
assert result == messages
def test_truncate_by_turns_ensures_user_first(self):
"""Test that truncate_by_turns ensures user message comes first."""
truncator = ContextTruncator()
# Create scenario where truncation might start with assistant
messages = self.create_messages(20)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=3, drop_turns=1
)
# First non-system message should be user
assert result[0].role == "user"
def test_truncate_by_turns_multiple_drop(self):
"""Test truncate_by_turns with multiple turns dropped at once."""
truncator = ContextTruncator()
messages = self.create_messages(20)
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=5, drop_turns=3
)
# Should drop 3 turns when limit exceeded
assert len(result) < len(messages)
# ==================== truncate_by_dropping_oldest_turns Tests ====================
def test_truncate_by_dropping_oldest_turns_zero(self):
"""Test truncate_by_dropping_oldest_turns with drop_turns=0."""
truncator = ContextTruncator()
messages = self.create_messages(10)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=0)
assert result == messages
def test_truncate_by_dropping_oldest_turns_negative(self):
"""Test truncate_by_dropping_oldest_turns with negative drop_turns."""
truncator = ContextTruncator()
messages = self.create_messages(10)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=-1)
assert result == messages
def test_truncate_by_dropping_oldest_turns_basic(self):
"""Test basic truncate_by_dropping_oldest_turns functionality."""
truncator = ContextTruncator()
# Create 10 messages = 5 turns
messages = self.create_messages(10)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=2)
# Should drop 2 oldest turns (4 messages)
assert len(result) == 6
# Should start with user message
assert result[0].role == "user"
def test_truncate_by_dropping_oldest_turns_with_system(self):
"""Test truncate_by_dropping_oldest_turns preserves system messages."""
truncator = ContextTruncator()
messages = self.create_messages(10, include_system=True)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=2)
# System message should be preserved
assert result[0].role == "system"
assert result[0].content == "System prompt"
def test_truncate_by_dropping_oldest_turns_drop_all(self):
"""Test truncate_by_dropping_oldest_turns dropping all turns."""
truncator = ContextTruncator()
# Create 4 messages = 2 turns
messages = self.create_messages(4)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=2)
# Should drop all turns
assert len(result) == 0
def test_truncate_by_dropping_oldest_turns_drop_more_than_available(self):
"""Test truncate_by_dropping_oldest_turns with drop_turns > available turns."""
truncator = ContextTruncator()
# Create 4 messages = 2 turns
messages = self.create_messages(4)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=5)
# Should result in empty list
assert len(result) == 0
def test_truncate_by_dropping_oldest_turns_ensures_user_first(self):
"""Test that result starts with user message after dropping."""
truncator = ContextTruncator()
messages = self.create_messages(20)
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=3)
# First message should be user
if len(result) > 0:
assert result[0].role == "user"
# ==================== truncate_by_halving Tests ====================
def test_truncate_by_halving_empty(self):
"""Test truncate_by_halving with empty list."""
truncator = ContextTruncator()
result = truncator.truncate_by_halving([])
assert result == []
def test_truncate_by_halving_single_message(self):
"""Test truncate_by_halving with single message."""
truncator = ContextTruncator()
messages = [self.create_message("user", "Hello")]
result = truncator.truncate_by_halving(messages)
# Should not truncate if <= 2 messages
assert result == messages
def test_truncate_by_halving_two_messages(self):
"""Test truncate_by_halving with two messages."""
truncator = ContextTruncator()
messages = self.create_messages(2)
result = truncator.truncate_by_halving(messages)
# Should not truncate if <= 2 messages
assert result == messages
def test_truncate_by_halving_basic(self):
"""Test basic truncate_by_halving functionality."""
truncator = ContextTruncator()
# Create 20 messages
messages = self.create_messages(20)
result = truncator.truncate_by_halving(messages)
# Should delete 50% = 10 messages, keep 10
assert len(result) == 10
# First message should be user
assert result[0].role == "user"
def test_truncate_by_halving_with_system_message(self):
"""Test truncate_by_halving preserves system messages."""
truncator = ContextTruncator()
messages = self.create_messages(20, include_system=True)
result = truncator.truncate_by_halving(messages)
# System message should be preserved
assert result[0].role == "system"
assert result[0].content == "System prompt"
def test_truncate_by_halving_odd_count(self):
"""Test truncate_by_halving with odd number of messages."""
truncator = ContextTruncator()
messages = self.create_messages(11)
result = truncator.truncate_by_halving(messages)
# Should delete floor(11/2) = 5 messages, keep 6
# But after ensuring user first, may be 5
assert len(result) >= 5
assert result[0].role == "user"
def test_truncate_by_halving_ensures_user_first(self):
"""Test that result starts with user message."""
truncator = ContextTruncator()
# Create messages starting with user
messages = self.create_messages(30)
result = truncator.truncate_by_halving(messages)
# First message should be user
assert result[0].role == "user"
def test_truncate_by_halving_preserves_recent_messages(self):
"""Test that truncate_by_halving keeps the most recent 50%."""
truncator = ContextTruncator()
messages = [
self.create_message("user", "Message 0"),
self.create_message("assistant", "Message 1"),
self.create_message("user", "Message 2"),
self.create_message("assistant", "Message 3"),
]
result = truncator.truncate_by_halving(messages)
# Should keep last 2 messages
assert len(result) == 2
assert result[0].content == "Message 2"
assert result[1].content == "Message 3"
# ==================== Integration Tests ====================
def test_truncate_with_tool_messages(self):
"""Test truncation with tool messages."""
truncator = ContextTruncator()
messages = [
self.create_message("user", "Run tool"),
self.create_message("assistant", "Running..."),
self.create_message("tool", "Tool result"),
self.create_message("user", "Thanks"),
self.create_message("assistant", "Welcome"),
]
result = truncator.truncate_by_dropping_oldest_turns(messages, drop_turns=1)
# First turn (user+assistant+tool) should be dropped
# Tool message should be cleaned up by fix_messages
assert len(result) <= 2
def test_chain_multiple_truncations(self):
"""Test chaining multiple truncation methods."""
truncator = ContextTruncator()
messages = self.create_messages(40, include_system=True)
# First: truncate by turns
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=10, drop_turns=2
)
# Then: halve
result = truncator.truncate_by_halving(result)
# Should have system message + truncated content
assert result[0].role == "system"
assert len(result) < len(messages)
def test_empty_after_system_message(self):
"""Test truncation when only system message exists."""
truncator = ContextTruncator()
messages = [self.create_message("system", "System prompt")]
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=5, drop_turns=1
)
# Should keep system message
assert len(result) == 1
assert result[0].role == "system"
def test_all_system_messages(self):
"""Test truncation with only system messages."""
truncator = ContextTruncator()
messages = [
self.create_message("system", "System 1"),
self.create_message("system", "System 2"),
]
result = truncator.truncate_by_turns(
messages, keep_most_recent_turns=0, drop_turns=1
)
# System messages should be preserved, but since there are no non-system
# messages and keep_most_recent_turns=0, result should be system messages only
assert len(result) >= 0 # May keep system messages or clear all
if len(result) > 0:
assert all(msg.role == "system" for msg in result)
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