test: specific API key scenarios

tests/OpenAiTest.php

@@ -603,3 +603,29 @@
     $this->assertStringContainsString('"object": "list"', $steps);
     $this->assertStringContainsString('data', $steps);
 })->group('working');
+
+$open_ai_with_unset_api_key = new OpenAi();
+
+it('should throw error when API key is not set', function () use ($open_ai_with_unset_api_key) {
+    expect(fn () => $open_ai_with_unset_api_key->completion([
+        'prompt' => "Hello",
+        'temperature' => 0.9,
+        "max_tokens" => 150,
+        "frequency_penalty" => 0,
+        "presence_penalty" => 0.6,
+    ]))->toThrow(Exception::class, 'Please provide an API key.');
+})->group('api-keys');
+
+$open_ai_with_set_api_key = (new OpenAi())->setApiKey(getenv('OPENAI_API_KEY'));
+
+it('should handle simple completion with API key set', function () use ($open_ai_with_set_api_key) {
+    $result = $open_ai_with_set_api_key->completion([
+        'prompt' => "Hello",
+        'temperature' => 0.9,
+        "max_tokens" => 150,
+        "frequency_penalty" => 0,
+        "presence_penalty" => 0.6,
+    ]);
+
+    $this->assertStringContainsString('text', $result);
+})->group('api-keys');