diff --git a/src/StaticPHP/Config/ArtifactConfig.php b/src/StaticPHP/Config/ArtifactConfig.php
index d25c6dd1..8244acd6 100644
--- a/src/StaticPHP/Config/ArtifactConfig.php
+++ b/src/StaticPHP/Config/ArtifactConfig.php
@@ -31,7 +31,7 @@ class ArtifactConfig
      */
     public static function loadFromFile(string $file): void
     {
-        $content = file_get_contents($file);
+        $content = @file_get_contents($file);
         if ($content === false) {
             throw new WrongUsageException("Failed to read artifact config file: {$file}");
         }
diff --git a/src/StaticPHP/Config/PackageConfig.php b/src/StaticPHP/Config/PackageConfig.php
index dc0b3d54..dda9761b 100644
--- a/src/StaticPHP/Config/PackageConfig.php
+++ b/src/StaticPHP/Config/PackageConfig.php
@@ -38,7 +38,7 @@ class PackageConfig
      */
     public static function loadFromFile(string $file): void
     {
-        $content = file_get_contents($file);
+        $content = @file_get_contents($file);
         if ($content === false) {
             throw new WrongUsageException("Failed to read package config file: {$file}");
         }
diff --git a/tests/StaticPHP/Config/ArtifactConfigTest.php b/tests/StaticPHP/Config/ArtifactConfigTest.php
index dc396488..28312dd7 100644
--- a/tests/StaticPHP/Config/ArtifactConfigTest.php
+++ b/tests/StaticPHP/Config/ArtifactConfigTest.php
@@ -26,7 +26,7 @@ class ArtifactConfigTest extends TestCase
         $reflection = new \ReflectionClass(ArtifactConfig::class);
         $property = $reflection->getProperty('artifact_configs');
         $property->setAccessible(true);
-        $property->setValue([]);
+        $property->setValue(null, []);
     }
 
     /** @noinspection PhpExpressionResultUnusedInspection */
@@ -42,7 +42,7 @@ class ArtifactConfigTest extends TestCase
         $reflection = new \ReflectionClass(ArtifactConfig::class);
         $property = $reflection->getProperty('artifact_configs');
         $property->setAccessible(true);
-        $property->setValue([]);
+        $property->setValue(null, []);
     }
 
     public function testLoadFromDirThrowsExceptionWhenDirectoryDoesNotExist(): void
diff --git a/tests/StaticPHP/Config/PackageConfigTest.php b/tests/StaticPHP/Config/PackageConfigTest.php
index 4072e39e..a705cfdb 100644
--- a/tests/StaticPHP/Config/PackageConfigTest.php
+++ b/tests/StaticPHP/Config/PackageConfigTest.php
@@ -26,7 +26,7 @@ class PackageConfigTest extends TestCase
         $reflection = new \ReflectionClass(PackageConfig::class);
         $property = $reflection->getProperty('package_configs');
         $property->setAccessible(true);
-        $property->setValue([]);
+        $property->setValue(null, []);
     }
 
     protected function tearDown(): void
@@ -41,7 +41,7 @@ class PackageConfigTest extends TestCase
         $reflection = new \ReflectionClass(PackageConfig::class);
         $property = $reflection->getProperty('package_configs');
         $property->setAccessible(true);
-        $property->setValue([]);
+        $property->setValue(null, []);
     }
 
     public function testLoadFromDirThrowsExceptionWhenDirectoryDoesNotExist(): void
diff --git a/tests/StaticPHP/DI/CallbackInvokerTest.php b/tests/StaticPHP/DI/CallbackInvokerTest.php
index 751a70eb..0a757b63 100644
--- a/tests/StaticPHP/DI/CallbackInvokerTest.php
+++ b/tests/StaticPHP/DI/CallbackInvokerTest.php
@@ -7,15 +7,15 @@ namespace Tests\StaticPHP\DI;
 use DI\Container;
 use PHPUnit\Framework\TestCase;
 use StaticPHP\DI\CallbackInvoker;
+use StaticPHP\Exception\SPCInternalException;
 
 /**
  * Helper class that requires constructor parameters for testing
  */
-class UnresolvableTestClass
+readonly class UnresolvableTestClass
 {
-    public function __construct(
-        private string $requiredParam
-    ) {}
+    /** @noinspection PhpPropertyOnlyWrittenInspection */
+    public function __construct(private string $requiredParam) {}
 }
 
 /**
@@ -92,7 +92,7 @@ class CallbackInvokerTest extends TestCase
 
         // Should not resolve from container as 'test.service' is not a type
         // Will try default value or null
-        $this->expectException(\RuntimeException::class);
+        $this->expectException(SPCInternalException::class);
         $this->invoker->invoke($callback);
     }
 
@@ -139,7 +139,7 @@ class CallbackInvokerTest extends TestCase
             return $required;
         };
 
-        $this->expectException(\RuntimeException::class);
+        $this->expectException(SPCInternalException::class);
         $this->expectExceptionMessage("Cannot resolve parameter 'required' of type 'string'");
         $this->invoker->invoke($callback);
     }
@@ -527,7 +527,7 @@ class CallbackInvokerTest extends TestCase
         $callback = eval('return function (string|int $param) { return $param; };');
 
         // Union types are not ReflectionNamedType, should not be resolved from container
-        $this->expectException(\RuntimeException::class);
+        $this->expectException(SPCInternalException::class);
         $this->invoker->invoke($callback);
     }
 
@@ -594,7 +594,7 @@ class CallbackInvokerTest extends TestCase
             return $obj;
         };
 
-        $this->expectException(\RuntimeException::class);
+        $this->expectException(SPCInternalException::class);
         $this->expectExceptionMessage("Cannot resolve parameter 'obj'");
 
         $this->invoker->invoke($callback);