/
directive-helpers_test.ts
172 lines (145 loc) · 5.52 KB
/
directive-helpers_test.ts
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/**
* @license
* Copyright 2020 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
import {html, ChildPart, render, svg} from '../lit-html.js';
import {assert} from '@esm-bundle/chai';
import {stripExpressionComments} from './test-utils/strip-markers.js';
import {
getDirectiveClass,
insertPart,
isDirectiveResult,
isPrimitive,
isTemplateResult,
removePart,
setChildPartValue,
TemplateResultType,
} from '../directive-helpers.js';
import {classMap} from '../directives/class-map.js';
import {directive, Directive, AsyncDirective} from '../async-directive.js';
suite('directive-helpers', () => {
let container: HTMLDivElement;
const assertContent = (html: string, root = container) => {
return assert.equal(stripExpressionComments(root.innerHTML), html);
};
setup(() => {
container = document.createElement('div');
});
test('isPrimitive', () => {
assert.isTrue(isPrimitive(null));
assert.isTrue(isPrimitive(undefined));
assert.isTrue(isPrimitive(true));
assert.isTrue(isPrimitive(1));
assert.isTrue(isPrimitive('a'));
assert.isTrue(isPrimitive(Symbol()));
// Can't polyfill this syntax:
// assert.isTrue(isPrimitive(1n));
assert.isFalse(isPrimitive({}));
assert.isFalse(isPrimitive(() => {}));
});
test('isTemplateResult', () => {
assert.isTrue(isTemplateResult(html``));
assert.isTrue(isTemplateResult(svg``));
assert.isTrue(isTemplateResult(html``, TemplateResultType.HTML));
assert.isTrue(isTemplateResult(svg``, TemplateResultType.SVG));
assert.isFalse(isTemplateResult(null));
assert.isFalse(isTemplateResult(undefined));
assert.isFalse(isTemplateResult({}));
assert.isFalse(isTemplateResult(html``, TemplateResultType.SVG));
assert.isFalse(isTemplateResult(svg``, TemplateResultType.HTML));
assert.isFalse(isTemplateResult(null, TemplateResultType.HTML));
assert.isFalse(isTemplateResult(undefined, TemplateResultType.HTML));
assert.isFalse(isTemplateResult({}, TemplateResultType.HTML));
});
test('isDirectiveResult', () => {
assert.isTrue(isDirectiveResult(classMap({})));
assert.isFalse(isDirectiveResult(null));
assert.isFalse(isDirectiveResult(undefined));
assert.isFalse(isDirectiveResult({}));
});
test('getDirectiveClass', () => {
assert.instanceOf(getDirectiveClass(classMap({}))?.prototype, Directive);
assert.equal(getDirectiveClass(null), undefined);
assert.equal(getDirectiveClass(undefined), undefined);
assert.equal(getDirectiveClass({}), undefined);
});
test('insertPart', () => {
class TestDirective extends Directive {
render(v: unknown) {
return v;
}
override update(part: ChildPart, [v]: Parameters<this['render']>) {
// Create two parts and remove the first, then the second to make sure
// that removing the first doesn't move the second's markers. This
// fails if the parts accidentally share a marker.
const childPart2 = insertPart(part, undefined);
const childPart1 = insertPart(part, undefined, childPart2);
removePart(childPart1);
removePart(childPart2);
return v;
}
}
const testDirective = directive(TestDirective);
const go = (v: unknown) =>
render(html`<div>${testDirective(v)}</div>`, container);
go('A');
assertContent('<div>A</div>');
});
test('insertPart keeps connectinon state in sync', () => {
// Directive that tracks/renders connected state
let connected = false;
const aDirective = directive(
class extends AsyncDirective {
render() {
connected = this.isConnected;
return this.isConnected;
}
override disconnected() {
connected = false;
assert.equal(connected, this.isConnected);
this.setValue(connected);
}
override reconnected() {
connected = true;
assert.equal(connected, this.isConnected);
this.setValue(connected);
}
}
);
const container1 = container.appendChild(document.createElement('div'));
const container2 = container.appendChild(document.createElement('div'));
// Create disconnected root part
const rootPart1 = render('rootPart1:', container1);
rootPart1.setConnected(false);
// Create connected root part
const rootPart2 = render('rootPart2:', container2);
// Insert child part into disconnected root part
const movingPart = insertPart(rootPart1);
const template = (v: unknown) => html`<p>${v}</p>`;
setChildPartValue(movingPart, template(aDirective()));
// Verify child part is not connected
assertContent('rootPart1:<p>false</p>', container1);
assertContent('rootPart2:', container2);
assert.isFalse(connected);
// Move child part into connected root part
insertPart(rootPart2, undefined, movingPart);
// Verify child part is connected
assertContent('rootPart1:', container1);
assertContent('rootPart2:<p>true</p>', container2);
assert.isTrue(connected);
// Flip connection state of parts
rootPart1.setConnected(true);
rootPart2.setConnected(false);
// Verify child part is not connected
assertContent('rootPart1:', container1);
assertContent('rootPart2:<p>false</p>', container2);
assert.isFalse(connected);
// Move child part into connected root part
insertPart(rootPart1, undefined, movingPart);
// Verify child part is connected
assertContent('rootPart1:<p>true</p>', container1);
assertContent('rootPart2:', container2);
assert.isTrue(connected);
});
});