import pytest
from app.services.tracker import estimate_tokens


class TestTracker:
    def test_estimate_tokens_empty(self):
        assert estimate_tokens("") == 0

    def test_estimate_tokens_short(self):
        tokens = estimate_tokens("Hello world")
        assert tokens > 0
        assert tokens < 10

    def test_estimate_tokens_long(self):
        text = "word " * 100
        tokens = estimate_tokens(text)
        assert tokens > 50
        assert tokens < 300