Zhang Jason
63 lines
2.5 KiB
TypeScript
63 lines
2.5 KiB
TypeScript
/**
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* CappedTextBuffer unit tests: capacity drop keeps the tail, the omitted tally accumulates,
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* drain() prefixes the drop marker and clears the buffer, and isEmpty tracks both text and tally.
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*/
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import { describe, expect, it } from "vitest";
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import { CappedTextBuffer } from "../src/environment/tools/background/index.js";
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describe("CappedTextBuffer", () => {
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it("starts empty and drains to an empty string", () => {
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const buf = new CappedTextBuffer(10, "earlier output");
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expect(buf.isEmpty).toBe(true);
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expect(buf.drain()).toBe("");
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});
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it("keeps content under capacity verbatim", () => {
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const buf = new CappedTextBuffer(10, "earlier output");
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buf.append("hello");
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expect(buf.isEmpty).toBe(false);
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expect(buf.drain()).toBe("hello");
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expect(buf.isEmpty).toBe(true);
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});
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it("drops the oldest chars past capacity and keeps the tail", () => {
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const buf = new CappedTextBuffer(5, "earlier output");
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buf.append("abcdefg"); // 7 chars, cap 5 -> drop "ab", keep "cdefg"
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expect(buf.drain()).toBe("[... 2 chars of earlier output dropped ...]\ncdefg");
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});
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it("handles a single append larger than the cap", () => {
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const buf = new CappedTextBuffer(3, "earlier output");
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buf.append("0123456789"); // drop 7, keep "789"
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expect(buf.drain()).toBe("[... 7 chars of earlier output dropped ...]\n789");
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});
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it("accumulates the omitted tally across multiple over-cap appends", () => {
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const buf = new CappedTextBuffer(4, "earlier output");
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buf.append("aaaaaa"); // drop 2, keep "aaaa"
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buf.append("bb"); // now "aaaabb" -> drop 2 more, keep "aabb"
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expect(buf.drain()).toBe("[... 4 chars of earlier output dropped ...]\naabb");
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});
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it("clears text and tally after drain", () => {
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const buf = new CappedTextBuffer(2, "earlier output");
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buf.append("xyz"); // drop 1, keep "yz"
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buf.drain();
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expect(buf.isEmpty).toBe(true);
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expect(buf.drain()).toBe("");
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});
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it("uses the drop label in the marker", () => {
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const buf = new CappedTextBuffer(1, "earlier subagent output");
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buf.append("ab"); // drop 1
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expect(buf.drain()).toBe("[... 1 chars of earlier subagent output dropped ...]\nb");
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});
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it("stays non-empty when only dropped chars remain unread", () => {
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const buf = new CappedTextBuffer(0, "earlier output");
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buf.append("ab"); // cap 0 -> everything dropped, text empty but tally=2
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expect(buf.isEmpty).toBe(false);
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expect(buf.drain()).toBe("[... 2 chars of earlier output dropped ...]\n");
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});
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});
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