Add tests

Author: stevebauman

tests/Unit/Collections/LengthAwarePaginator.php

@@ -0,0 +1,106 @@
+<?php
+
+use DirectoryTree\ImapEngine\Pagination\LengthAwarePaginator;
+use Illuminate\Support\Collection;
+
+test('it returns the correct items', function () {
+    $items = new Collection(['Item 1', 'Item 2', 'Item 3']);
+
+    $paginator = new LengthAwarePaginator($items, total: 3, perPage: 3, currentPage: 1);
+
+    expect($paginator->items())->toBe($items);
+});
+
+test('it calculates the total correctly', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 25, perPage: 5, currentPage: 1);
+
+    expect($paginator->total())->toBe(25);
+});
+
+test('it calculates the per page correctly', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 30, perPage: 5, currentPage: 1);
+
+    expect($paginator->perPage())->toBe(5);
+});
+
+test('it can determine the current page', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 30, perPage: 5, currentPage: 2);
+
+    expect($paginator->currentPage())->toBe(2);
+});
+
+test('it calculates the last page', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 30, perPage: 5, currentPage: 1);
+
+    expect($paginator->lastPage())->toBe(6);
+});
+
+test('it can tell if there are enough items for multiple pages', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 6, perPage: 5, currentPage: 1);
+
+    expect($paginator->hasPages())->toBeTrue();
+});
+
+test('it can detect if there are more pages', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 10, perPage: 5, currentPage: 1);
+
+    expect($paginator->hasMorePages())->toBeTrue();
+});
+
+test('it provides a correct next page url', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 10, perPage: 5, currentPage: 1, path: 'http://example.com/users');
+
+    expect($paginator->nextPageUrl())->toBe('http://example.com/users?page=2');
+});
+
+test('it provides a correct previous page url', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 10, perPage: 5, currentPage: 2, path: 'http://example.com/users');
+
+    expect($paginator->previousPageUrl())->toBe('http://example.com/users?page=1');
+});
+
+test('it returns null for next page url when on last page', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 10, perPage: 5, currentPage: 2, path: 'http://example.com/users');
+
+    expect($paginator->nextPageUrl())->toBeNull();
+});
+
+test('it returns null for previous page url when on first page', function () {
+    $paginator = new LengthAwarePaginator(new Collection, total: 10, perPage: 5, currentPage: 1, path: 'http://example.com/users');
+
+    expect($paginator->previousPageUrl())->toBeNull();
+});
+
+test('it returns an array representation', function () {
+    $paginator = new LengthAwarePaginator(new Collection(['Item 1', 'Item 2']), total: 2, perPage: 2, currentPage: 1, path: 'http://example.com/users');
+
+    $array = $paginator->toArray();
+
+    expect($array)->toMatchArray([
+        'path' => 'http://example.com/users',
+        'data' => ['Item 1', 'Item 2'],
+        'total' => 2,
+        'per_page' => 2,
+        'last_page' => 1,
+        'current_page' => 1,
+        'from' => 1,
+        'to' => 2,
+        'first_page_url' => 'http://example.com/users?page=1',
+        'last_page_url' => 'http://example.com/users?page=1',
+        'next_page_url' => null,
+        'prev_page_url' => null,
+    ]);
+});
+
+test('it preserves existing query parameters in the next page url', function () {
+    $paginator = new LengthAwarePaginator(
+        new Collection,
+        total: 10,
+        perPage: 5,
+        currentPage: 1,
+        path: 'http://example.com/users',
+        query: ['foo' => 'bar']
+    );
+
+    expect($paginator->nextPageUrl())->toBe('http://example.com/users?foo=bar&page=2');
+});