88 lines
1.6 KiB
JavaScript
88 lines
1.6 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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"use strict";
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const { UndoStack } = require("resource://devtools/client/shared/undo.js");
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const MAX_SIZE = 5;
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function run_test() {
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let str = "";
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const stack = new UndoStack(MAX_SIZE);
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function add(ch) {
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stack.do(
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function () {
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str += ch;
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},
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function () {
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str = str.slice(0, -1);
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}
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);
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}
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Assert.ok(!stack.canUndo());
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Assert.ok(!stack.canRedo());
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// Check adding up to the limit of the size
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add("a");
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Assert.ok(stack.canUndo());
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Assert.ok(!stack.canRedo());
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add("b");
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add("c");
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add("d");
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add("e");
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Assert.equal(str, "abcde");
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// Check a simple undo+redo
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stack.undo();
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Assert.equal(str, "abcd");
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Assert.ok(stack.canRedo());
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stack.redo();
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Assert.equal(str, "abcde");
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Assert.ok(!stack.canRedo());
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// Check an undo followed by a new action
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stack.undo();
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Assert.equal(str, "abcd");
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add("q");
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Assert.equal(str, "abcdq");
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Assert.ok(!stack.canRedo());
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stack.undo();
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Assert.equal(str, "abcd");
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stack.redo();
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Assert.equal(str, "abcdq");
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// Revert back to the beginning of the queue...
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while (stack.canUndo()) {
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stack.undo();
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}
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Assert.equal(str, "");
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// Now put it all back....
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while (stack.canRedo()) {
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stack.redo();
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}
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Assert.equal(str, "abcdq");
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// Now go over the undo limit...
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add("1");
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add("2");
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add("3");
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Assert.equal(str, "abcdq123");
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// And now undoing the whole stack should only undo 5 actions.
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while (stack.canUndo()) {
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stack.undo();
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}
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Assert.equal(str, "abc");
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}
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