laravel-llm-gateway/laravel-app/tests/Unit/Services/MistralProviderTest.php

<?php

namespace Tests\Unit\Services;

use Tests\TestCase;
use App\Services\LLM\Providers\MistralProvider;
use App\Models\ModelPricing;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Cache;
use Illuminate\Foundation\Testing\RefreshDatabase;

class MistralProviderTest extends TestCase
{
    use RefreshDatabase;

    private MistralProvider $provider;

    protected function setUp(): void
    {
        parent::setUp();
        $this->provider = new MistralProvider('test-api-key');
    }

    public function test_builds_request_correctly(): void
    {
        $messages = [
            ['role' => 'user', 'content' => 'Hello']
        ];
        
        $options = [
            'model' => 'mistral-small-latest',
            'temperature' => 0.8,
            'max_tokens' => 1000
        ];

        $reflection = new \ReflectionClass($this->provider);
        $method = $reflection->getMethod('buildRequest');
        $method->setAccessible(true);

        $result = $method->invoke($this->provider, $messages, $options);

        $this->assertEquals('mistral-small-latest', $result['model']);
        $this->assertEquals(0.8, $result['temperature']);
        $this->assertEquals(1000, $result['max_tokens']);
        $this->assertEquals($messages, $result['messages']);
        $this->assertArrayNotHasKey('stream', $result); // stream=false is filtered out
    }

    public function test_normalizes_response_correctly(): void
    {
        $rawResponse = [
            'id' => 'cmpl-123',
            'model' => 'mistral-small-latest',
            'choices' => [
                [
                    'message' => [
                        'role' => 'assistant',
                        'content' => 'Bonjour! Comment puis-je vous aider?'
                    ],
                    'finish_reason' => 'stop'
                ]
            ],
            'usage' => [
                'prompt_tokens' => 12,
                'completion_tokens' => 18,
                'total_tokens' => 30
            ]
        ];

        $normalized = $this->provider->normalizeResponse($rawResponse);

        $this->assertEquals('cmpl-123', $normalized['id']);
        $this->assertEquals('mistral-small-latest', $normalized['model']);
        $this->assertEquals('Bonjour! Comment puis-je vous aider?', $normalized['content']);
        $this->assertEquals('assistant', $normalized['role']);
        $this->assertEquals('stop', $normalized['finish_reason']);
        $this->assertEquals(12, $normalized['usage']['prompt_tokens']);
        $this->assertEquals(18, $normalized['usage']['completion_tokens']);
        $this->assertEquals(30, $normalized['usage']['total_tokens']);
    }

    public function test_calculates_cost_correctly(): void
    {
        ModelPricing::updateOrCreate(
            [
                'provider' => 'mistral',
                'model' => 'mistral-small-latest',
                'effective_from' => now()->toDateString(),
            ],
            [
                'input_price_per_million' => 0.20,
                'output_price_per_million' => 0.60,
                'is_active' => true,
            ]
        );

        Cache::flush();

        $cost = $this->provider->calculateCost(1000, 500, 'mistral-small-latest');

        // Expected: (1000/1M * 0.20) + (500/1M * 0.60) = 0.0002 + 0.0003 = 0.0005
        $this->assertEquals(0.0005, $cost);
    }

    public function test_handles_api_errors(): void
    {
        Http::fake([
            'https://api.mistral.ai/*' => Http::response(['error' => 'Invalid API key'], 401)
        ]);

        $this->expectException(\App\Exceptions\ProviderException::class);
        $this->expectExceptionMessage('Invalid API key');

        $this->provider->chatCompletion([
            ['role' => 'user', 'content' => 'test']
        ]);
    }

    public function test_get_supported_models(): void
    {
        $models = $this->provider->getSupportedModels();

        $this->assertIsArray($models);
        $this->assertContains('mistral-large-latest', $models);
        $this->assertContains('mistral-small-latest', $models);
        $this->assertContains('open-mixtral-8x7b', $models);
    }
}