Multi Line String Test

1import { describe, expect, it } from "vitest";
2import { query } from "./clickhouse.js";
3import { NeedMoreData, Cursor } from "../src/readers/core.js";
4import { readMultiLineString } from "../src/readers/geo.js";
5
6async function reader(expr: string): Promise<Cursor> {
7  return new Cursor(await query(`SELECT ${expr} FORMAT RowBinary`));
8}
9
10describe("readMultiLineString", () => {
11  it("decodes a MultiLineString as an array of line strings", async () => {
12    const r = await reader("CAST([[(0, 0), (1, 1)]] AS MultiLineString)");
13    expect(readMultiLineString(r)).toEqual([
14      [
15        [0, 0],
16        [1, 1],
17      ],
18    ]);
19  });
20
21  describe("advance() edge cases", () => {
22    it("throws NeedMoreData for every incomplete prefix (0 .. full.length-1)", async () => {
23      const full = await query(
24        "SELECT CAST([[(0, 0), (1, 1)]] AS MultiLineString) FORMAT RowBinary",
25      );
26      for (let len = 0; len < full.length; len++) {
27        const r = new Cursor(full.subarray(0, len));
28        let thrown: unknown;
29        try {
30          readMultiLineString(r);
31        } catch (e) {
32          thrown = e;
33        }
34        expect(thrown, `prefix length ${len} of ${full.length}`).toBe(
35          NeedMoreData,
36        );
37      }
38    });
39  });
40});