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fix(common): KeyValuePipe should return empty array for empty objects (#27258)

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This lets KeyValuePipe return an empty array (rather than undefined)
when the input is empty.

PR Close #27258
This commit is contained in:
Ingo Bürk
2018-11-24 16:00:13 +01:00
committed by Miško Hevery
parent f9545d1b1a
commit b39efdd9d6
2 changed files with 9 additions and 3 deletions
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8
packages/common/test/pipes/keyvalue_pipe_spec.ts
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@ -25,6 +25,10 @@ describe('KeyValuePipe', () => {
expect(pipe.transform(fn as any)).toEqual(null);
});
describe('object dictionary', () => {
it('should return empty array of an empty dictionary', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform({})).toEqual([]);
});
it('should transform a basic dictionary', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform({1: 2})).toEqual([{key: '1', value: 2}]);
@ -62,6 +66,10 @@ describe('KeyValuePipe', () => {
});
describe('Map', () => {
it('should return an empty array for an empty Map', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(new Map())).toEqual([]);
});
it('should transform a basic Map', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(new Map([[1, 2]]))).toEqual([{key: 1, value: 2}]);