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master @ 68 LINES
 
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import { describe, expect, it } from "vitest";
import { renderChain, type FlowGraph } from "./flow";
import { checkGrid, len } from "./ascii";

const graph = (edges: [string, string, string?][], labels: [string, string][] = []
): FlowGraph => ({
  labels: new Map(labels),
  edges: edges.map(([from, to, label]) => ({ from, to, label: label ?? "" })),
});

describe("renderChain", () => {
  it("lays a fitting chain out horizontally with labels over the wires", () => {
    expect(renderChain(graph([["a", "b", "go"]]), 40)).toBe(
      [
        "      go",
        "┌───┐    ┌───┐",
        "│ a │───>│ b │",
        "└───┘    └───┘",
      ].join("\n"),
    );
  });

  it("omits the label row when no edge has a label", () => {
    expect(renderChain(graph([["a", "b"]]), 40)!.split("\n").length).toBe(3);
  });

  it("falls back to a straight vertical spine when too wide", () => {
    expect(renderChain(graph([["alpha", "b", "go"]]), 10)).toBe(
      [
        "┌───────┐",
        "│ alpha │",
        "└───┬───┘",
        "    │ go",
        "    ↓",
        "  ┌─┴─┐",
        "  │ b │",
        "  └───┘",
      ].join("\n"),
    );
  });

  it("renders vertically when horizontal is not preferred", () => {
    const art = renderChain(graph([["a", "b"]]), 80, false)!;
    expect(art.split("\n").length).toBeGreaterThan(4);
    expect(art).toContain("↓");
  });

  it("uses display labels and stays on-grid within width", () => {
    const art = renderChain(
      graph([["md", "rh", "transforms"], ["rh", "fr", "emits"]], [["md", "markdown
"], ["rh", "rehype"], ["fr", "frames"]]),
      86,
    )!;
    expect(art).toContain("markdown");
    expect(() => checkGrid(art, 86, "t")).not.toThrow();
    for (const line of art.split("\n")) expect(len(line)).toBeLessThanOrEqual(86);
  });

  it("realigns edges authored out of chain order", () => {
    const art = renderChain(graph([["b", "c", "second"], ["a", "b", "first"]]), 80
)!;
    const labelRow = art.split("\n")[0];
    expect(labelRow.indexOf("first")).toBeLessThan(labelRow.indexOf("second"));
  });

  it("returns null for branching graphs and cycles", () => {
    expect(renderChain(graph([["a", "b"], ["a", "c"]]), 80)).toBeNull();
    expect(renderChain(graph([["a", "b"], ["b", "a"]]), 80)).toBeNull();
  });
});


import { describe, expect, it } from "vitest
";
import { renderChain, type FlowGraph } from 
"./flow";
import { checkGrid, len } from "./ascii";

const graph = (edges: [string, string, strin
g?][], labels: [string, string][] = []): Flo
wGraph => ({
  labels: new Map(labels),
  edges: edges.map(([from, to, label]) => ({
 from, to, label: label ?? "" })),
});

describe("renderChain", () => {
  it("lays a fitting chain out horizontally 
with labels over the wires", () => {
    expect(renderChain(graph([["a", "b", "go
"]]), 40)).toBe(
      [
        "      go",
        "┌───┐    ┌───┐",
        "│ a │───>│ b │",
        "└───┘    └───┘",
      ].join("\n"),
    );
  });

  it("omits the label row when no edge has a
 label", () => {
    expect(renderChain(graph([["a", "b"]]), 
40)!.split("\n").length).toBe(3);
  });

  it("falls back to a straight vertical spin
e when too wide", () => {
    expect(renderChain(graph([["alpha", "b",
 "go"]]), 10)).toBe(
      [
        "┌───────┐",
        "│ alpha │",
        "└───┬───┘",
        "    │ go",
        "    ↓",
        "  ┌─┴─┐",
        "  │ b │",
        "  └───┘",
      ].join("\n"),
    );
  });

  it("renders vertically when horizontal is 
not preferred", () => {
    const art = renderChain(graph([["a", "b"
]]), 80, false)!;
    expect(art.split("\n").length).toBeGreat
erThan(4);
    expect(art).toContain("↓");
  });

  it("uses display labels and stays on-grid 
within width", () => {
    const art = renderChain(
      graph([["md", "rh", "transforms"], ["r
h", "fr", "emits"]], [["md", "markdown"], ["
rh", "rehype"], ["fr", "frames"]]),
      86,
    )!;
    expect(art).toContain("markdown");
    expect(() => checkGrid(art, 86, "t")).no
t.toThrow();
    for (const line of art.split("\n")) expe
ct(len(line)).toBeLessThanOrEqual(86);
  });

  it("realigns edges authored out of chain o
rder", () => {
    const art = renderChain(graph([["b", "c"
, "second"], ["a", "b", "first"]]), 80)!;
    const labelRow = art.split("\n")[0];
    expect(labelRow.indexOf("first")).toBeLe
ssThan(labelRow.indexOf("second"));
  });

  it("returns null for branching graphs and 
cycles", () => {
    expect(renderChain(graph([["a", "b"], ["
a", "c"]]), 80)).toBeNull();
    expect(renderChain(graph([["a", "b"], ["
b", "a"]]), 80)).toBeNull();
  });
});

 
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