Point Test

1import { describe, expect, it } from "vitest";
2import { query } from "./clickhouse.js";
3import { NeedMoreData, Cursor } from "../src/readers/core.js";
4import { readPoint } 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("readPoint", () => {
11  it("decodes a Point as [x, y]", async () => {
12    const r = await reader("CAST((1.5, 2.5) AS Point)");
13    expect(readPoint(r)).toEqual([1.5, 2.5]);
14    expect(r.pos).toBe(16); // two Float64
15  });
16
17  describe("advance() edge cases", () => {
18    it("throws NeedMoreData for every incomplete prefix (0 .. full.length-1)", async () => {
19      const full = await query(
20        "SELECT CAST((1.5, 2.5) AS Point) FORMAT RowBinary",
21      );
22      for (let len = 0; len < full.length; len++) {
23        const r = new Cursor(full.subarray(0, len));
24        let thrown: unknown;
25        try {
26          readPoint(r);
27        } catch (e) {
28          thrown = e;
29        }
30        expect(thrown, `prefix length ${len} of ${full.length}`).toBe(
31          NeedMoreData,
32        );
33      }
34    });
35  });
36});