test(models): reorganize tests namespace and add PromptsTest

- Move ModelRegistryTest, ModelRegistryYamlTest and ModelsYamlTest into tests/Models directory
- Update their namespaces and file paths to `Bblslug\Tests\Models`
- Add PromptsTest to cover Prompts::load() exception handling and render() placeholder replacement

Author: bionicman

tests/ModelRegistryTest.php tests/Models/ModelRegistryTest.phptests/ModelRegistryTest.php renamed to tests/Models/ModelRegistryTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Bblslug\Tests;
+namespace Bblslug\Tests\Models;
 
 use Bblslug\Models\Drivers\AnthropicDriver;
 use Bblslug\Models\Drivers\DeepLDriver;

tests/ModelRegistryYamlTest.php tests/Models/ModelRegistryYamlTest.phptests/ModelRegistryYamlTest.php renamed to tests/Models/ModelRegistryYamlTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Bblslug\Tests;
+namespace Bblslug\Tests\Models;
 
 use Bblslug\Models\ModelRegistry;
 use PHPUnit\Framework\TestCase;

tests/ModelsYamlTest.php tests/Models/ModelsYamlTest.phptests/ModelsYamlTest.php renamed to tests/Models/ModelsYamlTest.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Bblslug\Tests;
+namespace Bblslug\Tests\Models;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Yaml;
@@ -13,7 +13,7 @@ class ModelsYamlTest extends TestCase
     /** @test */
     public function modelsYamlIsValidAndNonEmpty(): void
     {
-        $path = __DIR__ . '/../resources/models.yaml';
+        $path = __DIR__ . '/../../resources/models.yaml';
 
         $this->assertFileExists($path, 'models.yaml must exist');
         $this->assertIsReadable($path, 'models.yaml must be readable');

tests/Models/PromptsTest.php

@@ -0,0 +1,95 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bblslug\Tests\Models;
+
+use PHPUnit\Framework\TestCase;
+use Bblslug\Models\Prompts;
+use ReflectionClass;
+
+class PromptsTest extends TestCase
+{
+    private string $yamlPath;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        // Reset internal cache
+        $ref = new ReflectionClass(Prompts::class);
+        $prop = $ref->getProperty('templates');
+        $prop->setAccessible(true);
+        $prop->setValue(null, null);
+
+        // Prepare a temporary YAML file for testing
+        $this->yamlPath = sys_get_temp_dir() . '/prompts_test.yaml';
+        if (file_exists($this->yamlPath)) {
+            unlink($this->yamlPath);
+        }
+    }
+
+    protected function tearDown(): void
+    {
+        // Clean up temp file
+        if (file_exists($this->yamlPath)) {
+            unlink($this->yamlPath);
+        }
+        parent::tearDown();
+    }
+
+    /** @test */
+    public function testLoadThrowsExceptionForMissingFile(): void
+    {
+        // Should throw when file is not readable
+        $this->expectException(\RuntimeException::class);
+        Prompts::load('/path/does/not/exist.yaml');
+    }
+
+    /** @test */
+    public function testRenderReplacesPlaceholders(): void
+    {
+        // Create a simple YAML with one template
+        $yaml = <<<YAML
+translator:
+  text: 'Translate from {source} to {target}: {text}'
+YAML;
+        file_put_contents($this->yamlPath, $yaml);
+
+        // Load our test YAML
+        Prompts::load($this->yamlPath);
+
+        // Render the template with variables
+        $output = Prompts::render(
+            kind: 'translator',
+            format: 'text',
+            vars: ['source' => 'en', 'target' => 'fr', 'text' => 'Hello']
+        );
+
+        $this->assertSame(
+            'Translate from en to fr: Hello',
+            $output
+        );
+    }
+
+    /** @test */
+    public function testRenderThrowsExceptionForUndefinedTemplate(): void
+    {
+        // Create YAML with a single known template
+        $yaml = <<<YAML
+bot:
+  html: '<p>{message}</p>'
+YAML;
+        file_put_contents($this->yamlPath, $yaml);
+
+        Prompts::load($this->yamlPath);
+
+        // Trying to render missing kind.format should fail
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage("Prompt 'unknown.json' not found");
+        Prompts::render(
+            kind: 'unknown',
+            format: 'json',
+            vars: []
+        );
+    }
+}