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undoablelist.spec.ts
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undoablelist.spec.ts
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { expect } from 'chai';
import { JSONObject } from '@phosphor/coreutils';
import { ObservableUndoableList, ISerializer } from '@jupyterlab/observables';
class Test {
constructor(value: JSONObject) {
this._value = value;
}
get value(): JSONObject {
return this._value;
}
private _value: JSONObject;
}
let count = 0;
class Serializer implements ISerializer<Test> {
fromJSON(value: JSONObject): Test {
value['count'] = count++;
return new Test(value);
}
toJSON(value: Test): JSONObject {
return value.value;
}
}
const serializer = new Serializer();
const value: JSONObject = { name: 'foo' };
describe('@jupyterlab/observables', () => {
describe('ObservableUndoableList', () => {
describe('#constructor', () => {
it('should create a new ObservableUndoableList', () => {
const list = new ObservableUndoableList(serializer);
expect(list).to.be.an.instanceof(ObservableUndoableList);
});
});
describe('#canRedo', () => {
it('should return false if there is no history', () => {
const list = new ObservableUndoableList(serializer);
expect(list.canRedo).to.equal(false);
});
it('should return true if there is an undo that can be redone', () => {
const list = new ObservableUndoableList(serializer);
list.push(new Test(value));
list.undo();
expect(list.canRedo).to.equal(true);
});
});
describe('#canUndo', () => {
it('should return false if there is no history', () => {
const list = new ObservableUndoableList(serializer);
expect(list.canUndo).to.equal(false);
});
it('should return true if there is a change that can be undone', () => {
const list = new ObservableUndoableList(serializer);
list.push(serializer.fromJSON(value));
expect(list.canUndo).to.equal(true);
});
});
describe('#dispose()', () => {
it('should dispose of the resources used by the list', () => {
const list = new ObservableUndoableList(serializer);
list.dispose();
expect(list.isDisposed).to.equal(true);
list.dispose();
expect(list.isDisposed).to.equal(true);
});
});
describe('#beginCompoundOperation()', () => {
it('should begin a compound operation', () => {
const list = new ObservableUndoableList(serializer);
list.beginCompoundOperation();
list.push(serializer.fromJSON(value));
list.push(serializer.fromJSON(value));
list.endCompoundOperation();
expect(list.canUndo).to.equal(true);
list.undo();
expect(list.canUndo).to.equal(false);
});
it('should not be undoable if isUndoAble is set to false', () => {
const list = new ObservableUndoableList(serializer);
list.beginCompoundOperation(false);
list.push(serializer.fromJSON(value));
list.push(serializer.fromJSON(value));
list.endCompoundOperation();
expect(list.canUndo).to.equal(false);
});
});
describe('#endCompoundOperation()', () => {
it('should end a compound operation', () => {
const list = new ObservableUndoableList(serializer);
list.beginCompoundOperation();
list.push(serializer.fromJSON(value));
list.push(serializer.fromJSON(value));
list.endCompoundOperation();
expect(list.canUndo).to.equal(true);
list.undo();
expect(list.canUndo).to.equal(false);
});
});
describe('#undo()', () => {
it('should undo a push', () => {
const list = new ObservableUndoableList(serializer);
list.push(serializer.fromJSON(value));
list.undo();
expect(list.length).to.equal(0);
});
it('should undo a pushAll', () => {
const list = new ObservableUndoableList(serializer);
list.pushAll([serializer.fromJSON(value), serializer.fromJSON(value)]);
list.undo();
expect(list.length).to.equal(0);
});
it('should undo a remove', () => {
const list = new ObservableUndoableList(serializer);
list.pushAll([serializer.fromJSON(value), serializer.fromJSON(value)]);
list.remove(0);
list.undo();
expect(list.length).to.equal(2);
});
it('should undo a removeRange', () => {
const list = new ObservableUndoableList(serializer);
list.pushAll([
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value)
]);
list.removeRange(1, 3);
list.undo();
expect(list.length).to.equal(6);
});
it('should undo a move', () => {
const items = [
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value)
];
const list = new ObservableUndoableList(serializer);
list.pushAll(items);
list.move(1, 2);
list.undo();
expect((list.get(1) as any)['count']).to.equal(
(items[1] as any)['count']
);
});
});
describe('#redo()', () => {
it('should redo a push', () => {
const list = new ObservableUndoableList(serializer);
list.push(serializer.fromJSON(value));
list.undo();
list.redo();
expect(list.length).to.equal(1);
});
it('should redo a pushAll', () => {
const list = new ObservableUndoableList(serializer);
list.pushAll([serializer.fromJSON(value), serializer.fromJSON(value)]);
list.undo();
list.redo();
expect(list.length).to.equal(2);
});
it('should redo a remove', () => {
const list = new ObservableUndoableList(serializer);
list.pushAll([serializer.fromJSON(value), serializer.fromJSON(value)]);
list.remove(0);
list.undo();
list.redo();
expect(list.length).to.equal(1);
});
it('should redo a removeRange', () => {
const list = new ObservableUndoableList(serializer);
list.pushAll([
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value)
]);
list.removeRange(1, 3);
list.undo();
list.redo();
expect(list.length).to.equal(4);
});
it('should undo a move', () => {
const items = [
serializer.fromJSON(value),
serializer.fromJSON(value),
serializer.fromJSON(value)
];
const list = new ObservableUndoableList(serializer);
list.pushAll(items);
list.move(1, 2);
list.undo();
list.redo();
expect((list.get(2) as any)['count']).to.equal(
(items[1] as any)['count']
);
});
});
describe('#clearUndo()', () => {
it('should clear the undo stack', () => {
const list = new ObservableUndoableList(serializer);
list.push(serializer.fromJSON(value));
list.clearUndo();
expect(list.canUndo).to.equal(false);
});
});
});
});