test: add Pest test suite for LaravelFacebookFeed

tests/LaravelFacebookFeedTest.php

@@ -0,0 +1,157 @@
+<?php
+
+declare(strict_types=1);
+
+use Wearepixel\LaravelFacebookFeed\Exceptions\MissingRequiredFieldException;
+use Wearepixel\LaravelFacebookFeed\LaravelFacebookFeed;
+
+function validProduct(array $overrides = []): array
+{
+    return array_merge([
+        'id'         => 'prod-1',
+        'link'       => 'https://example.com/product',
+        'title'      => 'Test Product',
+        'price'      => '29.99 AUD',
+        'image_link' => 'https://example.com/image.jpg',
+    ], $overrides);
+}
+
+describe('init', function () {
+    it('stores title, description, and link', function () {
+        $feed = LaravelFacebookFeed::init('My Store', 'My Desc', 'https://example.com');
+        expect($feed->title)->toBe('My Store')
+            ->and($feed->description)->toBe('My Desc')
+            ->and($feed->link)->toBe('https://example.com');
+    });
+
+    it('defaults to empty strings', function () {
+        $feed = LaravelFacebookFeed::init();
+        expect($feed->title)->toBe('')
+            ->and($feed->description)->toBe('')
+            ->and($feed->link)->toBe('');
+    });
+});
+
+describe('addItem', function () {
+    it('accepts a valid item without throwing', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        $feed->addItem(validProduct());
+        expect($feed->toXml())->toContain('prod-1');
+    });
+
+    it('throws for missing required field', function (string $field) {
+        $product = validProduct();
+        unset($product[$field]);
+        expect(fn () => LaravelFacebookFeed::init()->addItem($product))
+            ->toThrow(MissingRequiredFieldException::class);
+    })->with(['id', 'link', 'title', 'price', 'image_link']);
+
+    it('throws with a message containing the field name', function () {
+        $product = validProduct();
+        unset($product['price']);
+        expect(fn () => LaravelFacebookFeed::init()->addItem($product))
+            ->toThrow(MissingRequiredFieldException::class, 'price');
+    });
+});
+
+describe('toXml', function () {
+    it('returns a string', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        expect($feed->toXml())->toBeString();
+    });
+
+    it('contains the RSS xmlns:g attribute', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        expect($feed->toXml())->toContain('xmlns:g="http://base.google.com/ns/1.0"');
+    });
+
+    it('contains the RSS version attribute', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        expect($feed->toXml())->toContain('version="2.0"');
+    });
+
+    it('includes the channel title, description and link', function () {
+        $feed = LaravelFacebookFeed::init('My Store', 'My Desc', 'https://example.com');
+        $xml = $feed->toXml();
+        expect($xml)
+            ->toContain('<title>My Store</title>')
+            ->toContain('<description>My Desc</description>')
+            ->toContain('<link>https://example.com</link>');
+    });
+
+    it('includes product data', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        $feed->addItem(validProduct());
+        $xml = $feed->toXml();
+        expect($xml)
+            ->toContain('<id>prod-1</id>')
+            ->toContain('<title>Test Product</title>');
+    });
+
+    it('wraps products in item tags', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        $feed->addItem(validProduct());
+        expect($feed->toXml())
+            ->toContain('<item>')
+            ->toContain('</item>');
+    });
+
+    it('handles multiple products', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        $feed->addItem(validProduct(['id' => 'prod-1']));
+        $feed->addItem(validProduct(['id' => 'prod-2']));
+        $xml = $feed->toXml();
+        expect($xml)
+            ->toContain('prod-1')
+            ->toContain('prod-2');
+        expect(substr_count($xml, '<item>'))->toBe(2);
+    });
+
+    it('includes product price and image_link fields', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        $feed->addItem(validProduct());
+        $xml = $feed->toXml();
+        expect($xml)
+            ->toContain('<price>29.99 AUD</price>')
+            ->toContain('<image_link>https://example.com/image.jpg</image_link>');
+    });
+
+    it('generates valid xml with no products', function () {
+        $feed = LaravelFacebookFeed::init('My Store', 'My Desc', 'https://example.com');
+        $xml = $feed->toXml();
+        expect($xml)
+            ->toBeString()
+            ->toContain('<title>My Store</title>')
+            ->not->toContain('<item>');
+    });
+
+    it('includes the xml declaration', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        expect($feed->toXml())->toStartWith('<?xml');
+    });
+
+    it('generates parseable xml', function () {
+        $feed = LaravelFacebookFeed::init('Store', 'Desc', 'https://example.com');
+        $feed->addItem(validProduct());
+        $result = simplexml_load_string($feed->toXml());
+        expect($result)->not->toBeFalse();
+    });
+});
+
+describe('generate', function () {
+    it('returns an HTTP 200 response', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        expect($feed->generate()->getStatusCode())->toBe(200);
+    });
+
+    it('sets the content type to application/rss+xml', function () {
+        $feed = LaravelFacebookFeed::init('', '', '');
+        expect($feed->generate()->headers->get('Content-Type'))->toContain('application/rss+xml');
+    });
+
+    it('returns the xml in the response body', function () {
+        $feed = LaravelFacebookFeed::init('Store', 'Desc', 'https://example.com');
+        $feed->addItem(validProduct());
+        expect($feed->generate()->getContent())->toBe($feed->toXml());
+    });
+});