Add anthropic test for the Chat capability

Author: charvimehradu

Tests/AnthropicProvider/ChatTest.php

@@ -0,0 +1,175 @@
+<?php
+
+use Joomla\AI\Exception\AuthenticationException;
+use Joomla\AI\Exception\ProviderException;
+use Joomla\AI\Exception\RateLimitException;
+use Joomla\AI\Exception\UnserializableResponseException;
+use Joomla\AI\Provider\AnthropicProvider;
+use Joomla\Http\Http;
+use Joomla\Http\HttpFactory;
+use Joomla\Http\Response as HttpResponse;
+use PHPUnit\Framework\TestCase;
+
+class ChatTest extends TestCase
+{
+    public function testChatReturnsSuccessfulResponse(): void
+    {
+        $httpFactoryMock = $this->createMock(HttpFactory::class);
+        $httpClientMock = $this->createMock(Http::class);
+        $httpFactoryMock->method('getHttp')->with([])->willReturn($httpClientMock);
+
+        $chatResponse = $this->createJsonResponse([
+            'id' => 'msg_123',
+            'type' => 'message',
+            'role' => 'assistant',
+            'model' => 'claude-3-haiku-20240307',
+            'content' => [
+                ['type' => 'text', 'text' => 'Hello from Claude!'],
+            ],
+            'usage' => [
+                'input_tokens' => 12,
+                'output_tokens' => 9,
+            ],
+            'stop_reason' => 'end_turn',
+            'stop_sequence' => null,
+        ]);
+
+        $httpClientMock->expects($this->once())->method('post')->with(
+            'https://api.anthropic.com/v1/messages',
+            $this->callback(function ($payload) {
+                $decoded = json_decode($payload, true);
+                $this->assertSame([['role' => 'user', 'content' => 'Hello there']], $decoded['messages']);
+                return true;
+            }),
+            $this->callback(function ($headers) {
+                $this->assertArrayHasKey('x-api-key', $headers);
+                $this->assertSame('test-api-key', $headers['x-api-key']);
+                return true;
+            }),
+            null
+        )->willReturn($chatResponse);
+
+        $provider = new AnthropicProvider(['api_key' => 'test-api-key'], $httpFactoryMock);
+        $response = $provider->chat('Hello there');
+
+        $this->assertSame(200, $response->getStatusCode());
+        $this->assertSame('Hello from Claude!', $response->getContent());
+
+        $metadata = $response->getMetadata();
+        $this->assertSame('claude-3-haiku-20240307', $metadata['model']);
+        $this->assertSame('end_turn', $metadata['stop_reason']);
+        $this->assertSame('Anthropic', $response->getProvider());
+    }
+
+    public function testChatStatusCodeReflectsMaxTokensStopReason(): void
+    {
+        $provider = $this->createProviderWithResponses([
+            $this->createJsonResponse([
+                'id' => 'msg_limit',
+                'type' => 'message',
+                'role' => 'assistant',
+                'model' => 'claude-3-sonnet',
+                'content' => [['type' => 'text', 'text' => 'Truncated reply']],
+                'usage' => ['input_tokens' => 100, 'output_tokens' => 200],
+                'stop_reason' => 'max_tokens',
+                'stop_sequence' => null,
+            ]),
+        ]);
+
+        $response = $provider->chat('Continue until you hit the limit.');
+
+        $this->assertSame(429, $response->getStatusCode());
+        $metadata = $response->getMetadata();
+        $this->assertSame('max_tokens', $metadata['stop_reason']);
+    }
+
+    public function testChatThrowsProviderExceptionWhenErrorReturned(): void
+    {
+        $provider = $this->createProviderWithResponses([
+            $this->createJsonResponse([
+                'error' => [
+                    'message' => 'Model overloaded',
+                    'type' => 'overloaded_error',
+                ],
+            ]),
+        ]);
+
+        $this->expectException(ProviderException::class);
+        $this->expectExceptionMessage('Model overloaded');
+
+        $provider->chat('Hello?');
+    }
+
+    public function testChatThrowsProviderExceptionOnHttpFailure(): void
+    {
+        $provider = $this->createProviderWithResponses([
+            $this->createJsonResponse([
+                'message' => 'Internal server error',
+            ], 500),
+        ]);
+
+        $this->expectException(ProviderException::class);
+        $this->expectExceptionMessage('Internal server error');
+
+        $provider->chat('Trigger failure');
+    }
+
+    public function testChatThrowsRateLimitExceptionWhenRateLimited(): void
+    {
+        $provider = $this->createProviderWithResponses([
+            $this->createJsonResponse([
+                'message' => 'Rate limit exceeded',
+            ], 429),
+        ]);
+
+        $this->expectException(RateLimitException::class);
+        $this->expectExceptionMessage('Rate limit exceeded');
+
+        $provider->chat('Spam request');
+    }
+
+    public function testChatThrowsAuthenticationExceptionWhenApiKeyMissing(): void
+    {
+        $httpFactoryMock = $this->createMock(HttpFactory::class);
+
+        $provider = new AnthropicProvider([], $httpFactoryMock);
+
+        $this->expectException(AuthenticationException::class);
+        $this->expectExceptionMessage('Anthropic API key not configured. Set ANTHROPIC_API_KEY environment variable or provide api_key option.');
+
+        $provider->chat('Hi');
+    }
+
+    public function testChatThrowsUnserializableResponseExceptionForInvalidJson(): void
+    {
+        $invalidJsonResponse = new HttpResponse('php://memory', 200, ['Content-Type' => 'application/json']);
+        $invalidJsonResponse->getBody()->write('{invalid');
+
+        $provider = $this->createProviderWithResponses([$invalidJsonResponse]);
+
+        $this->expectException(UnserializableResponseException::class);
+        $this->expectExceptionMessage('Syntax error');
+
+        $provider->chat('Return malformed payload');
+    }
+
+    private function createProviderWithResponses(array $responses): AnthropicProvider
+    {
+        $httpFactoryMock = $this->createMock(HttpFactory::class);
+        $httpClientMock = $this->createMock(Http::class);
+
+        $httpFactoryMock->method('getHttp')->with([])->willReturn($httpClientMock);
+
+        $httpClientMock->method('post')->willReturnOnConsecutiveCalls(...$responses);
+
+        return new AnthropicProvider(['api_key' => 'test-api-key'], $httpFactoryMock);
+    }
+
+    private function createJsonResponse(array $payload, int $status = 200): HttpResponse
+    {
+        $response = new HttpResponse('php://memory', $status, ['Content-Type' => 'application/json']);
+        $response->getBody()->write(json_encode($payload));
+
+        return $response;
+    }
+}