First steps to create a new ModelWithContent with a simplified conten…

…t/translation setup

src/Content/LabPage.php

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+<?php
+
+namespace Kirby\Content;
+
+use Kirby\Cms\Page;
+
+/**
+ * Test Model to prototype the content and translation
+ * mechanics
+ */
+class LabPage extends Page
+{
+	/**
+	 * Returns the content for the default version and given language code
+	 */
+	public function content(string|null $languageCode = null): Content
+	{
+		return $this->version()->content($languageCode ?? 'current');
+	}
+
+	/**
+	 * Sets the content when initializing a model manually.
+	 * This will switch to the in memory storage to keep the
+	 * content there instead of on disk or in a database.
+	 * The content will be created for the default version and language
+	 */
+	protected function setContent(array|null $content = null): static
+	{
+		// don't set anything if there's no content
+		if ($content === null) {
+			return $this;
+		}
+
+		$this->storage = new MemoryContentStorageHandler(
+			model: $this
+		);
+
+		$this->version()->create($content, 'default');
+
+		return $this;
+	}
+
+}

tests/Content/LabModelTest.php

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+<?php
+
+namespace Kirby\Content;
+
+use Kirby\Data\Data;
+
+class LabModelTest extends TestCase
+{
+	public const TMP = KIRBY_TMP_DIR . '/Content.LabeModel';
+
+	public function testContentMultiLanguage()
+	{
+		$this->setUpMultiLanguage();
+
+		$page = new LabPage([
+			'slug'     => 'test',
+			'template' => 'article'
+		]);
+
+		// write something to the content file to make sure it
+		// can be read from disk for the test.
+		Data::write($page->root() . '/article.en.txt', $content = [
+			'title' => 'Test'
+		]);
+
+		$this->assertSame($content, $page->content('en')->toArray());
+
+        $this->markTestIncomplete('TODO: The following assertion is only correct as long as we don’t merge translated content. It’s a breaking change so far compared to the previous behavior and needs to be fixed.');
+		$this->assertSame([], $page->content('de')->toArray());
+	}
+
+	public function testContentSingleLanguage()
+	{
+		$this->setUpSingleLanguage();
+
+		$page = new LabPage([
+			'slug'     => 'test',
+			'template' => 'article'
+		]);
+
+		// write something to the content file to make sure it
+		// can be read from disk for the test.
+		Data::write($page->root() . '/article.txt', $content = [
+			'title' => 'Test'
+		]);
+
+		$this->assertSame($content, $page->content()->toArray());
+	}
+
+	public function testContentNonExistingMultiLanguage()
+	{
+		$this->setUpMultiLanguage();
+
+		$page = new LabPage([
+			'slug' => 'test'
+		]);
+
+		$this->assertSame([], $page->content('en')->toArray());
+		$this->assertSame([], $page->content('de')->toArray());
+	}
+
+	public function testContentNonExistingSingleLanguage()
+	{
+		$this->setUpSingleLanguage();
+
+		$page = new LabPage([
+			'slug' => 'test'
+		]);
+
+		$this->assertSame([], $page->content()->toArray());
+	}
+
+	public function testSetContentMultiLanguage()
+	{
+		$this->setUpMultiLanguage();
+
+		$page = new LabPage([
+			'slug'    => 'test',
+			'content' => $content = [
+				'title' => 'Test'
+			]
+		]);
+
+		$this->assertSame($content, $page->content()->toArray());
+		$this->assertSame($content, $page->content('en')->toArray());
+
+        $this->markTestIncomplete('TODO: The following assertion is only correct as long as we don’t merge translated content. It’s a breaking change so far compared to the previous behavior and needs to be fixed.');
+		$this->assertSame([], $page->content('de')->toArray());
+	}
+
+	public function testSetContentSingleLanguage()
+	{
+		$this->setUpSingleLanguage();
+
+		$page = new LabPage([
+			'slug'    => 'test',
+			'content' => $content = [
+				'title' => 'Test'
+			]
+		]);
+
+		$this->assertSame($content, $page->content()->toArray());
+	}
+}