[Agent] Replace string concatenation with sprintf in exception messages

Author: OskarStark

src/agent/tests/AgentTest.php

@@ -92,7 +92,7 @@ public function testConstructorThrowsExceptionForInvalidInputProcessor()
         $invalidProcessor = new \stdClass();
 
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Processor "stdClass" must implement "'.InputProcessorInterface::class.'".');
+        $this->expectExceptionMessage(\sprintf('Processor "stdClass" must implement "%s".', InputProcessorInterface::class));
 
         /* @phpstan-ignore-next-line */
         new Agent($platform, $model, [$invalidProcessor]);
@@ -105,7 +105,7 @@ public function testConstructorThrowsExceptionForInvalidOutputProcessor()
         $invalidProcessor = new \stdClass();
 
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Processor "stdClass" must implement "'.OutputProcessorInterface::class.'".');
+        $this->expectExceptionMessage(\sprintf('Processor "stdClass" must implement "%s".', OutputProcessorInterface::class));
 
         /* @phpstan-ignore-next-line */
         new Agent($platform, $model, [], [$invalidProcessor]);

src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php

@@ -48,7 +48,7 @@ public function testProcessInputWithoutModelOption()
     public function testProcessInputWithInvalidModelOption()
     {
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Option "model" must be an instance of "'.Model::class.'".');
+        $this->expectExceptionMessage(\sprintf('Option "model" must be an instance of "%s".', Model::class));
 
         $gpt = new Gpt(Gpt::GPT_4O);
         $model = new MessageBag();

src/agent/tests/Toolbox/ToolboxTest.php

@@ -154,7 +154,7 @@ public function testExecuteWithUnknownTool()
     public function testExecuteWithMisconfiguredTool()
     {
         $this->expectException(ToolConfigurationException::class);
-        $this->expectExceptionMessage('Method "foo" not found in tool "'.ToolMisconfigured::class.'".');
+        $this->expectExceptionMessage(\sprintf('Method "foo" not found in tool "%s".', ToolMisconfigured::class));
 
         $toolbox = new Toolbox([new ToolMisconfigured()], new ReflectionToolFactory());