🧪TDD Challenge·advanced·⏱️ 35–50m·⭐ 225 XP
M-013Build a Context Window Manager
Description
Nebula Corp's chatbot keeps crashing when conversations get too long — it exceeds the model's context window. Build a context window manager that tracks token usage, implements smart truncation strategies (keep system prompt + recent messages + important messages), and warns when approaching the limit. The manager should support multiple truncation strategies: 'sliding-window', 'summarize-old', and 'priority-based'.
Test Cases (3)
Tracks token count
Should count tokens across messages
Input:testTokenCount()
Expected:CONTAINS:7
Sliding window keeps recent
Should keep system + recent messages after truncation
Input:testSlidingWindow()
Expected:CONTAINS:2
Detects near limit
Should detect when approaching token limit
Input:testNearLimit()
Expected:CONTAINS:true
Related Lessons
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