diff --git a/tests/AirInjectorTest.php b/tests/AirInjectorTest.php
index 2e27323..37447e7 100644
--- a/tests/AirInjectorTest.php
+++ b/tests/AirInjectorTest.php
@@ -90,20 +90,6 @@ public function testGetInstance(): void
         $this->assertInstanceOf($className, $instance);
     }
 
-    public function testGetInstanceSingleton(): void
-    {
-        $className = FakeTestClass::class;
-        $code = '<?php $isSingleton = true; return new ' . $className . '();';
-        file_put_contents(
-            $this->scriptDir . '/' . str_replace('\\', '_', $className) . '-' . Name::ANY . '.php',
-            $code
-        );
-
-        $instance1 = $this->injector->getInstance($className);
-        $instance2 = $this->injector->getInstance($className);
-        $this->assertSame($instance1, $instance2);
-    }
-
     public function testGetInstanceWithName(): void
     {
         $className = FakeTestClass::class;
diff --git a/tests/CompileInjectorExtendedScriptInjectorTest.php b/tests/CompileInjectorExtendedScriptInjectorTest.php
index 94cb8fc..a3b4ef3 100644
--- a/tests/CompileInjectorExtendedScriptInjectorTest.php
+++ b/tests/CompileInjectorExtendedScriptInjectorTest.php
@@ -19,18 +19,6 @@
 
 class CompileInjectorExtendedScriptInjectorTest extends TestCase
 {
-    /** @var CompileInjector */
-    private $injector;
-
-    protected function setUp(): void
-    {
-        @mkdir(__DIR__ . '/tmp');
-        $this->injector = new CompileInjector(
-            __DIR__ . '/tmp',
-            new LazyModule(new FakeCarModule())
-        );
-    }
-
     public function testGetInstance(): FakeCar
     {
         $tmpDir = $this->getTmpDir(__FUNCTION__);
@@ -53,8 +41,13 @@ public function testDefaultValueInjected(FakeCar $car): void
 
     public function testCompileException(): void
     {
+        $injector = new CompileInjector(
+            __DIR__ . '/tmp',
+            new LazyModule(new NullModule())
+        );
+
         $this->expectException(Unbound::class);
-        $this->injector->getInstance('invalid-class'); // @phpstan-ignore-line
+        $injector->getInstance('invalid-class'); // @phpstan-ignore-line
     }
 
     public function testToPrototype(): void
@@ -176,8 +169,13 @@ public function testOnDemandSingleton(): void
 
     public function testOnDemandPrototype(): void
     {
+        $injector = new CompileInjector(
+            __DIR__ . '/tmp',
+            new LazyModule(new NullModule())
+        );
+
         $this->expectException(Unbound::class); // CompileInjector does not support on-demand prototype
-        $this->injector->getInstance(FakeDependPrototype::class);
+        $injector->getInstance(FakeDependPrototype::class);
     }
 
     public function testOptional(): void