angular-cn/modules/angular2/test/common/pipes/slice_pipe_spec.ts

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import {
ddescribe,
describe,
it,
iit,
xit,
expect,
beforeEach,
afterEach,
browserDetection,
inject,
TestComponentBuilder,
AsyncTestCompleter
} from 'angular2/testing_internal';
import {Component} from 'angular2/core';
import {SlicePipe} from 'angular2/common';
export function main() {
describe("SlicePipe", () => {
var list: number[];
var str;
var pipe;
beforeEach(() => {
list = [1, 2, 3, 4, 5];
str = 'tuvwxyz';
pipe = new SlicePipe();
});
describe("supports", () => {
it("should support strings", () => { expect(pipe.supports(str)).toBe(true); });
it("should support lists", () => { expect(pipe.supports(list)).toBe(true); });
it("should not support other objects", () => {
expect(pipe.supports(new Object())).toBe(false);
expect(pipe.supports(null)).toBe(false);
});
});
describe("transform", () => {
it('should return all items after START index when START is positive and END is omitted',
() => {
expect(pipe.transform(list, [3])).toEqual([4, 5]);
expect(pipe.transform(str, [3])).toEqual('wxyz');
});
it('should return last START items when START is negative and END is omitted', () => {
expect(pipe.transform(list, [-3])).toEqual([3, 4, 5]);
expect(pipe.transform(str, [-3])).toEqual('xyz');
});
it('should return all items between START and END index when START and END are positive',
() => {
expect(pipe.transform(list, [1, 3])).toEqual([2, 3]);
expect(pipe.transform(str, [1, 3])).toEqual('uv');
});
it('should return all items between START and END from the end when START and END are negative',
() => {
expect(pipe.transform(list, [-4, -2])).toEqual([2, 3]);
expect(pipe.transform(str, [-4, -2])).toEqual('wx');
});
it('should return an empty value if START is greater than END', () => {
expect(pipe.transform(list, [4, 2])).toEqual([]);
expect(pipe.transform(str, [4, 2])).toEqual('');
});
it('should return an empty value if START greater than input length', () => {
expect(pipe.transform(list, [99])).toEqual([]);
expect(pipe.transform(str, [99])).toEqual('');
});
// Makes Edge to disconnect when running the full unit test campaign
// TODO: remove when issue is solved: https://github.com/angular/angular/issues/4756
if (!browserDetection.isEdge) {
it('should return entire input if START is negative and greater than input length', () => {
expect(pipe.transform(list, [-99])).toEqual([1, 2, 3, 4, 5]);
expect(pipe.transform(str, [-99])).toEqual('tuvwxyz');
});
it('should not modify the input list', () => {
expect(pipe.transform(list, [2])).toEqual([3, 4, 5]);
expect(list).toEqual([1, 2, 3, 4, 5]);
});
}
});
describe('integration', () => {
it('should work with mutable arrays',
inject([TestComponentBuilder, AsyncTestCompleter], (tcb: TestComponentBuilder, async) => {
tcb.createAsync(TestComp).then((fixture) => {
let mutable: number[] = [1, 2];
fixture.debugElement.componentInstance.data = mutable;
fixture.detectChanges();
expect(fixture.debugElement.nativeElement).toHaveText('2');
mutable.push(3);
fixture.detectChanges();
expect(fixture.debugElement.nativeElement).toHaveText('2,3');
async.done();
});
}));
});
});
}
@Component({selector: 'test-comp', template: '{{(data | slice:1).join(",") }}', pipes: [SlicePipe]})
class TestComp {
data: any;
}