Frankfurter Forex MCP

from __future__ import annotations

import pytest

from frankfurter_forex_mcp.models.schemas import HistoryInput
from frankfurter_forex_mcp.tools import exchange_history


class _ClientStub:
    async def history(
        self,
        start_date: str,
        end_date: str,
        source_currency: str,
        destination_currency: str,
    ) -> dict:
        return {
            "base": source_currency,
            "start_date": start_date,
            "end_date": end_date,
            "rates": {
                "2024-01-02": {destination_currency: 4.91},
                "2024-01-03": {destination_currency: 4.93},
            },
        }


@pytest.mark.asyncio
async def test_history_maps_series() -> None:
    input_data = HistoryInput(
        start="2024-01-01",
        end="2024-01-10",
        from_currency="USD",
        to_currency="BRL",
    )
    result = await exchange_history.execute(input_data, _ClientStub())

    assert result.total == 2
    assert result.points[0].rate == 4.91
    assert result.from_currency == "USD"