angular-docs-cn/modules/angular2/test/change_detection/coalesce_spec.ts

import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach} from 'angular2/test_lib';
import {isBlank} from 'angular2/src/facade/lang';

import {coalesce} from 'angular2/src/change_detection/coalesce';
import {RecordType, ProtoRecord} from 'angular2/src/change_detection/proto_record';
import {DirectiveIndex} from 'angular2/src/change_detection/directive_record';

export function main() {
  function r(funcOrValue, args, contextIndex, selfIndex,
             {lastInBinding, mode, name, directiveIndex}:
                 {lastInBinding?: any, mode?: any, name?: any, directiveIndex?: any} = {}) {
    if (isBlank(lastInBinding)) lastInBinding = false;
    if (isBlank(mode)) mode = RecordType.PROPERTY;
    if (isBlank(name)) name = "name";
    if (isBlank(directiveIndex)) directiveIndex = null;
    return new ProtoRecord(mode, name, funcOrValue, args, null, contextIndex, directiveIndex,
                           selfIndex, null, null, lastInBinding, false);
  }

  describe("change detection - coalesce", () => {
    it("should work with an empty list", () => { expect(coalesce([])).toEqual([]); });

    it("should remove non-terminal duplicate records" +
           " and update the context indices referencing them",
       () => {
         var rs = coalesce(
             [r("user", [], 0, 1), r("first", [], 1, 2), r("user", [], 0, 3), r("last", [], 3, 4)]);

         expect(rs).toEqual([r("user", [], 0, 1), r("first", [], 1, 2), r("last", [], 1, 3)]);
       });

    it("should update indices of other records", () => {
      var rs = coalesce(
          [r("dup", [], 0, 1), r("dup", [], 0, 2), r("user", [], 0, 3), r("first", [3], 3, 4)]);

      expect(rs).toEqual([r("dup", [], 0, 1), r("user", [], 0, 2), r("first", [2], 2, 3)]);
    });

    it("should remove non-terminal duplicate records" +
           " and update the args indices referencing them",
       () => {
         var rs = coalesce([
           r("user1", [], 0, 1),
           r("user2", [], 0, 2),
           r("hi", [1], 0, 3),
           r("hi", [1], 0, 4),
           r("hi", [2], 0, 5)
         ]);

         expect(rs).toEqual(
             [r("user1", [], 0, 1), r("user2", [], 0, 2), r("hi", [1], 0, 3), r("hi", [2], 0, 4)]);
       });

    it("should replace duplicate terminal records with self records", () => {
      var rs = coalesce(
          [r("user", [], 0, 1, {lastInBinding: true}), r("user", [], 0, 2, {lastInBinding: true})]);

      expect(rs[1]).toEqual(new ProtoRecord(RecordType.SELF, "self", null, [], null, 1, null, 2,
                                            null, null, true, false));
    });

    it("should not coalesce directive lifecycle records", () => {
      var rs = coalesce([
        r("onCheck", [], 0, 1, {mode: RecordType.DIRECTIVE_LIFECYCLE}),
        r("onCheck", [], 0, 1, {mode: RecordType.DIRECTIVE_LIFECYCLE})
      ]);

      expect(rs.length).toEqual(2);
    });

    it("should not coalesce protos with different names but same value", () => {
      var nullFunc = () => {};
      var rs = coalesce([
        r(nullFunc, [], 0, 1, {name: "foo"}),
        r(nullFunc, [], 0, 1, {name: "bar"}),
      ]);
      expect(rs.length).toEqual(2);
    });

    it("should not coalesce protos with the same context index but different directive indices",
       () => {
         var nullFunc = () => {};
         var rs = coalesce([
           r(nullFunc, [], 0, 1, {directiveIndex: new DirectiveIndex(0, 0)}),
           r(nullFunc, [], 0, 1, {directiveIndex: new DirectiveIndex(0, 1)}),
           r(nullFunc, [], 0, 1, {directiveIndex: new DirectiveIndex(1, 0)}),
           r(nullFunc, [], 0, 1, {directiveIndex: null}),
         ]);
         expect(rs.length).toEqual(4);
       });
  });
}