|
| 1 | +// Covers JSONL serialization behavior, including fail-fast on non-serializable |
| 2 | +// root values that JSON.stringify would otherwise coerce to the literal string |
| 3 | +// "undefined" (a silent transcript-data-loss path). |
| 4 | +import { describe, expect, it } from "vitest"; |
| 5 | +import { |
| 6 | +serializeJsonlEntry, |
| 7 | +serializeJsonlLine, |
| 8 | +serializeJsonlLines, |
| 9 | +} from "./transcript-jsonl.js"; |
| 10 | + |
| 11 | +describe("serializeJsonlLine", () => { |
| 12 | +it("throws TypeError when the root value is undefined", () => { |
| 13 | +expect(() => serializeJsonlLine(undefined)).toThrow(TypeError); |
| 14 | +expect(() => serializeJsonlLine(undefined)).toThrow(/not JSON-serializable/); |
| 15 | +}); |
| 16 | + |
| 17 | +it("throws TypeError when the root value is a function", () => { |
| 18 | +expect(() => serializeJsonlLine(() => 42)).toThrow(TypeError); |
| 19 | +}); |
| 20 | + |
| 21 | +it("throws TypeError when the root value is a symbol", () => { |
| 22 | +expect(() => serializeJsonlLine(Symbol("x"))).toThrow(TypeError); |
| 23 | +}); |
| 24 | + |
| 25 | +it("serializes null as the JSON literal 'null'", () => { |
| 26 | +expect(serializeJsonlLine(null)).toBe("null"); |
| 27 | +}); |
| 28 | + |
| 29 | +it("serializes primitives as their JSON representation", () => { |
| 30 | +expect(serializeJsonlLine("hello")).toBe('"hello"'); |
| 31 | +expect(serializeJsonlLine(42)).toBe("42"); |
| 32 | +expect(serializeJsonlLine(true)).toBe("true"); |
| 33 | +}); |
| 34 | + |
| 35 | +it("serializes plain objects and arrays (regression guard)", () => { |
| 36 | +expect(serializeJsonlLine({ msg: "hello" })).toBe('{"msg":"hello"}'); |
| 37 | +expect(serializeJsonlLine([1, 2, 3])).toBe("[1,2,3]"); |
| 38 | +}); |
| 39 | +}); |
| 40 | + |
| 41 | +describe("serializeJsonlEntry", () => { |
| 42 | +it("appends a newline terminator for serializable values", () => { |
| 43 | +expect(serializeJsonlEntry({ msg: "ok" })).toBe('{"msg":"ok"}\n'); |
| 44 | +}); |
| 45 | + |
| 46 | +it("throws for a non-serializable root value (does not emit 'undefined\\n')", () => { |
| 47 | +// Regression guard: the literal string "undefined" must never reach the file. |
| 48 | +expect(() => serializeJsonlEntry(undefined)).toThrow(TypeError); |
| 49 | +}); |
| 50 | +}); |
| 51 | + |
| 52 | +describe("serializeJsonlLines", () => { |
| 53 | +it("joins serialized lines and terminates the batch with a newline", () => { |
| 54 | +expect(serializeJsonlLines(['{"a":1}', '{"b":2}'])).toBe('{"a":1}\n{"b":2}\n'); |
| 55 | +}); |
| 56 | + |
| 57 | +it("returns an empty string for an empty batch", () => { |
| 58 | +expect(serializeJsonlLines([])).toBe(""); |
| 59 | +}); |
| 60 | +}); |
