Remove return types from test cases

Author: TomLisankie

src/platform/tests/Bridge/Anthropic/ModelClientTest.php

@@ -25,7 +25,7 @@ class ModelClientTest extends TestCase
     private ModelClient $modelClient;
     private Claude $model;
 
-    public function testAnthropicBetaHeaderIsSetWithSingleBetaFeature(): void
+    public function testAnthropicBetaHeaderIsSetWithSingleBetaFeature()
     {
         $this->httpClient = new MockHttpClient(function ($method, $url, $options) {
             $this->assertEquals('POST', $method);
@@ -45,7 +45,7 @@ public function testAnthropicBetaHeaderIsSetWithSingleBetaFeature(): void
         $this->modelClient->request($this->model, ['message' => 'test'], $options);
     }
 
-    public function testAnthropicBetaHeaderIsSetWithMultipleBetaFeatures(): void
+    public function testAnthropicBetaHeaderIsSetWithMultipleBetaFeatures()
     {
         $this->httpClient = new MockHttpClient(function ($method, $url, $options) {
             $headers = $this->parseHeaders($options['headers']);
@@ -62,7 +62,7 @@ public function testAnthropicBetaHeaderIsSetWithMultipleBetaFeatures(): void
         $this->modelClient->request($this->model, ['message' => 'test'], $options);
     }
 
-    public function testAnthropicBetaHeaderIsNotSetWhenBetaFeaturesIsEmpty(): void
+    public function testAnthropicBetaHeaderIsNotSetWhenBetaFeaturesIsEmpty()
     {
         $this->httpClient = new MockHttpClient(function ($method, $url, $options) {
             $headers = $this->parseHeaders($options['headers']);
@@ -78,7 +78,7 @@ public function testAnthropicBetaHeaderIsNotSetWhenBetaFeaturesIsEmpty(): void
         $this->modelClient->request($this->model, ['message' => 'test'], $options);
     }
 
-    public function testAnthropicBetaHeaderIsNotSetWhenBetaFeaturesIsNotProvided(): void
+    public function testAnthropicBetaHeaderIsNotSetWhenBetaFeaturesIsNotProvided()
     {
         $this->httpClient = new MockHttpClient(function ($method, $url, $options) {
             $headers = $this->parseHeaders($options['headers']);