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master @ 62 LINES
 
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import { describe, expect, it } from "vitest";
import { mermaidToAscii, normalizeArt, parseMermaid } from "./mermaid";
import { checkGrid } from "./ascii";

describe("parseMermaid", () => {
  it("parses the flowchart subset with labels and edge text", () => {
    const p = parseMermaid("graph LR\nmd[markdown] -->|transforms| rh[rehype]\nrh 
--> fr\n")!;
    expect(p.direction).toBe("LR");
    expect(p.graph.labels.get("md")).toBe("markdown");
    expect(p.graph.edges).toEqual([
      { from: "md", to: "rh", label: "transforms" },
      { from: "rh", to: "fr", label: "" },
    ]);
  });

  it("parses multiple arrows on one line", () => {
    const p = parseMermaid("graph LR\na --> b --> c\n")!;
    expect(p.graph.edges.map((e) => e.from + e.to)).toEqual(["ab", "bc"]);
  });

  it("ignores %% comments", () => {
    expect(parseMermaid("%% note\ngraph TD\na --> b\n")!.direction).toBe("TD");
  });

  it("returns null for syntax beyond the subset", () => {
    expect(parseMermaid("sequenceDiagram\nAlice->>Bob: hi")).toBeNull();
    expect(parseMermaid("graph LR\nsubgraph one\na --> b\nend")).toBeNull();
    expect(parseMermaid("graph RL\na --> b")).toBeNull();
  });
});

describe("normalizeArt", () => {
  it("swaps off-grid arrowheads and strips trailing space", () => {
    expect(normalizeArt("─?  \n?\n?─")).toBe("─>\n↓\n<─");
  });
});

describe("mermaidToAscii", () => {
  it("renders LR chains through the house layout", () => {
    const art = mermaidToAscii("graph LR\na -->|go| b", 40);
    expect(art).toBe(
      [
        "      go",
        "┌───┐    ┌───┐",
        "│ a │───>│ b │",
        "└───┘    └───┘",
      ].join("\n"),
    );
  });

  it("renders TD chains vertically", () => {
    const art = mermaidToAscii("graph TD\na -->|go| b", 80);
    expect(art).toContain("↓");
  });

  it("delegates branching graphs to mermaid-ascii and stays on-grid", () => {
    const art = mermaidToAscii("graph TD\na --> b\na --> c", 86);
    expect(art).toContain("┌");
    expect(() => checkGrid(art, 86, "t")).not.toThrow();
  });
});


import { describe, expect, it } from "vitest
";
import { mermaidToAscii, normalizeArt, parse
Mermaid } from "./mermaid";
import { checkGrid } from "./ascii";

describe("parseMermaid", () => {
  it("parses the flowchart subset with label
s and edge text", () => {
    const p = parseMermaid("graph LR\nmd[mar
kdown] -->|transforms| rh[rehype]\nrh --> fr
\n")!;
    expect(p.direction).toBe("LR");
    expect(p.graph.labels.get("md")).toBe("m
arkdown");
    expect(p.graph.edges).toEqual([
      { from: "md", to: "rh", label: "transf
orms" },
      { from: "rh", to: "fr", label: "" },
    ]);
  });

  it("parses multiple arrows on one line", (
) => {
    const p = parseMermaid("graph LR\na --> 
b --> c\n")!;
    expect(p.graph.edges.map((e) => e.from +
 e.to)).toEqual(["ab", "bc"]);
  });

  it("ignores %% comments", () => {
    expect(parseMermaid("%% note\ngraph TD\n
a --> b\n")!.direction).toBe("TD");
  });

  it("returns null for syntax beyond the sub
set", () => {
    expect(parseMermaid("sequenceDiagram\nAl
ice->>Bob: hi")).toBeNull();
    expect(parseMermaid("graph LR\nsubgraph 
one\na --> b\nend")).toBeNull();
    expect(parseMermaid("graph RL\na --> b")
).toBeNull();
  });
});

describe("normalizeArt", () => {
  it("swaps off-grid arrowheads and strips t
railing space", () => {
    expect(normalizeArt("─?  \n?\n?─")).toBe
("─>\n↓\n<─");
  });
});

describe("mermaidToAscii", () => {
  it("renders LR chains through the house la
yout", () => {
    const art = mermaidToAscii("graph LR\na 
-->|go| b", 40);
    expect(art).toBe(
      [
        "      go",
        "┌───┐    ┌───┐",
        "│ a │───>│ b │",
        "└───┘    └───┘",
      ].join("\n"),
    );
  });

  it("renders TD chains vertically", () => {
    const art = mermaidToAscii("graph TD\na 
-->|go| b", 80);
    expect(art).toContain("↓");
  });

  it("delegates branching graphs to mermaid-
ascii and stays on-grid", () => {
    const art = mermaidToAscii("graph TD\na 
--> b\na --> c", 86);
    expect(art).toContain("┌");
    expect(() => checkGrid(art, 86, "t")).no
t.toThrow();
  });
});

 
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