127 lines
3.8 KiB
Dart
127 lines
3.8 KiB
Dart
import 'package:angel3_paginate/angel3_paginate.dart';
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import 'package:test/test.dart';
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// Count-down from 100, then 101 at the end...
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final List<int> DATA = List<int>.generate(100, (i) => 100 - i)..add(101);
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void main() {
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group('cache', () {
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var cached = Paginator<int>(DATA),
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uncached = Paginator<int>(DATA, useCache: false);
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test('always cache current', () {
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expect(cached.current, cached.current);
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expect(uncached.current, uncached.current);
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});
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test('only cache prev/next if useCache != false', () {
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var cached1 = cached.current;
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cached.goToPage(4);
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var cached4 = cached.current;
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cached.goToPage(1);
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expect(cached.current, cached1);
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cached.goToPage(4);
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expect(cached.current, cached4);
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var uncached1 = uncached.current;
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uncached.goToPage(4);
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var uncached4 = uncached.current;
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uncached.goToPage(1);
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expect(uncached.current, isNot(uncached1));
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uncached.goToPage(4);
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expect(uncached.current, isNot(uncached4));
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});
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});
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test('default state', () {
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var paginator = Paginator<int>(DATA);
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expect(paginator.index, 0);
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expect(paginator.pageNumber, 1);
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expect(paginator.itemsPerPage, 5);
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expect(paginator.useCache, true);
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expect(paginator.canGoBack, false);
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expect(paginator.canGoForward, true);
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expect(paginator.lastPageNumber, 21);
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// Going back should do nothing
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var p = paginator.pageNumber;
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paginator.back();
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expect(paginator.pageNumber, p);
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});
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group('paginate', () {
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test('first page', () {
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var paginator = Paginator<int>(DATA);
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expect(paginator.pageNumber, 1);
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var r = paginator.current!;
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print(r.toJson());
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expect(r.total, DATA.length);
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expect(r.itemsPerPage, 5);
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expect(r.previousPage, -1);
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expect(r.currentPage, 1);
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expect(r.nextPage, 2);
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expect(r.startIndex, 0);
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expect(r.endIndex, 4);
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expect(r.data, DATA.skip(r.startIndex!).take(r.itemsPerPage!).toList());
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});
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});
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test('third page', () {
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var paginator = Paginator<int>(DATA)..goToPage(3);
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expect(paginator.pageNumber, 3);
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var r = paginator.current!;
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print(r.toJson());
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expect(r.total, DATA.length);
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expect(r.itemsPerPage, 5);
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expect(r.previousPage, 2);
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expect(r.currentPage, 3);
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expect(r.nextPage, 4);
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expect(r.startIndex, 10);
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expect(r.endIndex, 14);
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expect(r.data, DATA.skip(r.startIndex!).take(r.itemsPerPage!).toList());
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paginator.back();
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expect(paginator.pageNumber, 2);
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});
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test('last page', () {
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var paginator = Paginator<int>(DATA);
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paginator.goToPage(paginator.lastPageNumber);
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var r = paginator.current!;
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expect(r.total, DATA.length);
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expect(r.itemsPerPage, 5);
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expect(r.previousPage, paginator.lastPageNumber - 1);
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expect(r.currentPage, paginator.lastPageNumber);
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expect(r.nextPage, -1);
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expect(r.startIndex, (paginator.lastPageNumber - 1) * 5);
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expect(r.endIndex, r.startIndex);
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expect(r.data, [DATA.last]);
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expect(r.data, DATA.skip(r.startIndex!).take(r.itemsPerPage!).toList());
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});
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test('dump pages', () {
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var paginator = Paginator<int>(DATA);
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print('${paginator.lastPageNumber} page(s) of data:');
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do {
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print(' * Page #${paginator.pageNumber}: ${paginator.current!.data}');
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paginator.next();
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} while (paginator.canGoForward);
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});
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test('empty collection', () {
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var paginator = Paginator([]);
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var page = paginator.current!;
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print(page.toJson());
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expect(page.total, 0);
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expect(page.previousPage, -1);
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expect(page.nextPage, -1);
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expect(page.currentPage, 1);
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expect(page.startIndex, -1);
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expect(page.endIndex, -1);
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expect(page.data, isEmpty);
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expect(paginator.canGoBack, isFalse);
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expect(paginator.canGoForward, isFalse);
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});
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}
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