diff --git a/tests/ApplicationTest.php b/tests/ApplicationTest.php
index b2b491b..2892a8a 100644
--- a/tests/ApplicationTest.php
+++ b/tests/ApplicationTest.php
@@ -30,8 +30,13 @@ public function setUp(): void
 
     public function tearDown(): void
     {
-        unlink(static::$in);
-        unlink(static::$ou);
+        // Make sure we clean up after ourselves:
+        if (file_exists(static::$in)) {
+            unlink(static::$in);
+        }
+        if (file_exists(static::$ou)) {
+            unlink(static::$ou);
+        }
     }
 
     public function test_new()
diff --git a/tests/CliTestCase.php b/tests/CliTestCase.php
index 5396374..6554dad 100644
--- a/tests/CliTestCase.php
+++ b/tests/CliTestCase.php
@@ -46,7 +46,10 @@ public function tearDown(): void
 
     public static function tearDownAfterClass(): void
     {
-        unlink(static::$ou);
+        // Make sure we clean up after ourselves:
+        if (file_exists(static::$ou)) {
+            unlink(static::$ou);
+        }
     }
 
     public function buffer()
diff --git a/tests/Helper/OutputHelperTest.php b/tests/Helper/OutputHelperTest.php
index 7a0e763..c3987f7 100644
--- a/tests/Helper/OutputHelperTest.php
+++ b/tests/Helper/OutputHelperTest.php
@@ -34,7 +34,10 @@ public function setUp(): void
 
     public static function tearDownAfterClass(): void
     {
-        unlink(static::$ou);
+        // Make sure we clean up after ourselves:
+        if (file_exists(static::$ou)) {
+            unlink(static::$ou);
+        }
     }
 
     public function test_show_arguments()
diff --git a/tests/IO/InteractorTest.php b/tests/IO/InteractorTest.php
index c4552f1..0be146c 100644
--- a/tests/IO/InteractorTest.php
+++ b/tests/IO/InteractorTest.php
@@ -30,8 +30,13 @@ public function setUp(): void
 
     public function tearDown(): void
     {
-        unlink(static::$in);
-        unlink(static::$ou);
+        // Make sure we clean up after ourselves:
+        if (file_exists(static::$in)) {
+            unlink(static::$in);
+        }
+        if (file_exists(static::$ou)) {
+            unlink(static::$ou);
+        }
     }
 
     public function test_components()
diff --git a/tests/Input/ReaderTest.php b/tests/Input/ReaderTest.php
index 73947e4..a939136 100644
--- a/tests/Input/ReaderTest.php
+++ b/tests/Input/ReaderTest.php
@@ -26,7 +26,10 @@ public function setUp(): void
 
     public static function tearDownAfterClass(): void
     {
-        unlink(static::$in);
+        // Make sure we clean up after ourselves:
+        if (file_exists(static::$in)) {
+            unlink(static::$in);
+        }
     }
 
     public function test_default()