93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
"use strict";
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var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");
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var _defaultOverscanIndicesGetter = _interopRequireWildcard(require("./defaultOverscanIndicesGetter"));
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describe('overscanIndicesGetter', function () {
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function testHelper(_ref) {
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var cellCount = _ref.cellCount,
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startIndex = _ref.startIndex,
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stopIndex = _ref.stopIndex,
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overscanCellsCount = _ref.overscanCellsCount,
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scrollDirection = _ref.scrollDirection;
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return (0, _defaultOverscanIndicesGetter["default"])({
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cellCount: cellCount,
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overscanCellsCount: overscanCellsCount,
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scrollDirection: scrollDirection,
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startIndex: startIndex,
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stopIndex: stopIndex
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});
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}
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it('should not overscan if :overscanCellsCount is 0', function () {
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expect(testHelper({
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cellCount: 100,
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startIndex: 10,
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stopIndex: 20,
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overscanCellsCount: 0,
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scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_BACKWARD
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})).toEqual({
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overscanStartIndex: 10,
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overscanStopIndex: 20
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});
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expect(testHelper({
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cellCount: 100,
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startIndex: 10,
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stopIndex: 20,
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overscanCellsCount: 0,
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scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_FORWARD
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})).toEqual({
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overscanStartIndex: 10,
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overscanStopIndex: 20
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});
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});
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it('should overscan forward', function () {
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expect(testHelper({
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cellCount: 100,
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startIndex: 20,
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stopIndex: 30,
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overscanCellsCount: 10,
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scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_FORWARD
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})).toEqual({
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overscanStartIndex: 20,
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overscanStopIndex: 40
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});
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});
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it('should overscan backward', function () {
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expect(testHelper({
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cellCount: 100,
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startIndex: 20,
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stopIndex: 30,
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overscanCellsCount: 10,
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scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_BACKWARD
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})).toEqual({
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overscanStartIndex: 10,
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overscanStopIndex: 30
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});
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});
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it('should not overscan beyond the start of the list', function () {
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expect(testHelper({
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cellCount: 100,
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startIndex: 5,
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stopIndex: 15,
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overscanCellsCount: 10,
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scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_BACKWARD
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})).toEqual({
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overscanStartIndex: 0,
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overscanStopIndex: 15
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});
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});
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it('should not overscan beyond the end of the list', function () {
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expect(testHelper({
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cellCount: 25,
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startIndex: 10,
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stopIndex: 20,
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overscanCellsCount: 10,
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scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_FORWARD
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})).toEqual({
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overscanStartIndex: 10,
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overscanStopIndex: 24
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});
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});
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}); |