Carlos Florêncio
81 lines
2.6 KiB
TypeScript
81 lines
2.6 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import {
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getMessagePreview,
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MESSAGE_PREVIEW_MAX_CODE_UNITS,
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MESSAGE_PREVIEW_MAX_LINES,
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} from "./message-preview";
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describe("getMessagePreview", () => {
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it("keeps content at both limits unchanged", () => {
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const source = Array.from(
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{ length: MESSAGE_PREVIEW_MAX_LINES },
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(_, index) => `line-${index}`,
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).join("\n");
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const result = getMessagePreview(source, {
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maxCodeUnits: source.length,
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});
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expect(result).toEqual({
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content: source,
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truncated: false,
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logicalLines: MESSAGE_PREVIEW_MAX_LINES,
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codeUnits: source.length,
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});
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});
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it("stops before the line after the line budget", () => {
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const source = Array.from(
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{ length: MESSAGE_PREVIEW_MAX_LINES + 1 },
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(_, index) => `line-${index}`,
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).join("\n");
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const result = getMessagePreview(source);
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expect(result.truncated).toBe(true);
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expect(result.logicalLines).toBe(MESSAGE_PREVIEW_MAX_LINES);
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expect(result.content).toBe(
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`${Array.from({ length: MESSAGE_PREVIEW_MAX_LINES }, (_, index) => `line-${index}`).join("\n")}\n`,
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);
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expect(result.content).not.toContain(`line-${MESSAGE_PREVIEW_MAX_LINES}`);
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});
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it("stops at the code-unit budget without splitting a long line", () => {
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const source = "x".repeat(MESSAGE_PREVIEW_MAX_CODE_UNITS + 1);
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const result = getMessagePreview(source);
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expect(result.content).toBe("x".repeat(MESSAGE_PREVIEW_MAX_CODE_UNITS));
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expect(result.codeUnits).toBe(MESSAGE_PREVIEW_MAX_CODE_UNITS);
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expect(result.truncated).toBe(true);
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});
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it("keeps CRLF together at a code-unit boundary", () => {
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const result = getMessagePreview("first\r\nsecond", { maxCodeUnits: 5 });
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expect(result.content).toBe("first");
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expect(result.content.endsWith("\r")).toBe(false);
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expect(result.truncated).toBe(true);
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});
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it("counts CR and LF as separate logical line endings", () => {
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const result = getMessagePreview("first\rsecond\nthird");
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expect(result.logicalLines).toBe(3);
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expect(result.truncated).toBe(false);
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});
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it("does not split a surrogate pair", () => {
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const result = getMessagePreview("a🙂b", { maxCodeUnits: 2 });
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expect(result.content).toBe("a");
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expect(result.content).not.toContain("\uFFFD");
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expect(result.truncated).toBe(true);
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});
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it("returns empty content when no line or code-unit budget remains", () => {
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expect(getMessagePreview("content", { maxLines: 0 }).content).toBe("");
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expect(getMessagePreview("content", { maxCodeUnits: 0 }).content).toBe("");
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});
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});
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