Fermat MCP

import matplotlib matplotlib.use("Agg") from fastmcp.utilities.types import Image as FastImage from fmcp.mpl_mcp.core.stack_chart import plot_stack def test_stack_area_and_bar(): x = [0.0, 1.0, 2.0] y = [[1.0, 2.0, 3.0], [2.0, 1.0, 0.0]] img_area = plot_stack(x, y, chart_type="area", figsize=[6, 4]) assert isinstance(img_area, FastImage) assert img_area.data is not None, "img_area.data is None" assert img_area.data[:8] == b"\x89PNG\r\n\x1a\n" img_bar = plot_stack(x, y, chart_type="bar", figsize=[6, 4]) assert isinstance(img_bar, FastImage) assert img_bar.data is not None, "img_bar.data is None" assert img_bar.data[:8] == b"\x89PNG\r\n\x1a\n"