forked from Gitlink/forgeplus-react
66 lines
2.0 KiB
JavaScript
66 lines
2.0 KiB
JavaScript
import getUpdatedOffsetForIndex from './getUpdatedOffsetForIndex';
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import { getCellMetadata } from './TestHelper';
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describe('getUpdatedOffsetForIndex', function () {
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function testHelper(targetIndex, currentOffset) {
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var cellMetadata = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : getCellMetadata();
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return getUpdatedOffsetForIndex({
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cellOffset: cellMetadata[targetIndex].offset,
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cellSize: cellMetadata[targetIndex].size,
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containerSize: 50,
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currentOffset: currentOffset
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});
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}
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it('should scroll to the beginning', function () {
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expect(testHelper(0, 100)).toEqual(0);
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});
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it('should scroll forward to the middle', function () {
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expect(testHelper(4, 0)).toEqual(20);
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});
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it('should scroll backward to the middle', function () {
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expect(testHelper(2, 100)).toEqual(30);
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});
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it('should not scroll if an item is already visible', function () {
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expect(testHelper(2, 20)).toEqual(20);
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});
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it('should scroll to the end', function () {
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expect(testHelper(8, 0)).toEqual(110);
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});
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it('should honor specified :align values', function () {
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expect(getUpdatedOffsetForIndex({
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align: 'auto',
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cellOffset: 50,
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cellSize: 10,
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containerSize: 50,
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currentOffset: 0
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})).toEqual(10);
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expect(getUpdatedOffsetForIndex({
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align: 'start',
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cellOffset: 50,
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cellSize: 10,
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containerSize: 50,
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currentOffset: 0
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})).toEqual(50);
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expect(getUpdatedOffsetForIndex({
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align: 'auto',
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cellOffset: 50,
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cellSize: 10,
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containerSize: 50,
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currentOffset: 100
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})).toEqual(50);
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expect(getUpdatedOffsetForIndex({
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align: 'end',
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cellOffset: 50,
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cellSize: 10,
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containerSize: 50,
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currentOffset: 100
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})).toEqual(10);
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expect(getUpdatedOffsetForIndex({
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align: 'center',
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cellOffset: 50,
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cellSize: 10,
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containerSize: 50,
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currentOffset: 100
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})).toEqual(30);
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});
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}); |