51 lines
1.6 KiB
TypeScript
51 lines
1.6 KiB
TypeScript
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import TextBuffer from "../src/lib/text-buffer.js";
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import { describe, it, expect } from "vitest";
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// These tests ensure that the TextBuffer copy‑&‑paste logic keeps parity with
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// the Rust reference implementation (`textarea.rs`). When a multi‑line
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// string *without* a trailing newline is pasted at the beginning of a line,
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// the final pasted line should be merged with the text that originally
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// followed the caret – exactly how most editors behave.
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function setupBuffer(): TextBuffer {
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return new TextBuffer("ab\ncd\nef");
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}
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describe("TextBuffer – copy/paste multi‑line", () => {
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it("copies a multi‑line selection without the trailing newline", () => {
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const buf = setupBuffer();
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// Select from (0,0) → (1,2) ["ab", "cd"]
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buf.startSelection(); // anchor at 0,0
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buf.move("down"); // 1,0
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buf.move("right");
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buf.move("right"); // 1,2
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const copied = buf.copy();
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expect(copied).toBe("ab\ncd");
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});
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it("pastes the multi‑line clipboard as separate lines (does not merge with following text)", () => {
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const buf = setupBuffer();
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// Make the same selection and copy
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buf.startSelection();
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buf.move("down");
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buf.move("right");
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buf.move("right");
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buf.copy();
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// Move caret to the start of the last line and paste
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buf.move("down");
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buf.move("home"); // (2,0)
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const ok = buf.paste();
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expect(ok).toBe(true);
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// Desired final buffer – behaviour should match the Rust reference:
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// the final pasted line is *merged* with the original text on the
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// insertion row.
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expect(buf.getLines()).toEqual(["ab", "cd", "ab", "cdef"]);
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});
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});
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