fixes for PHP 7.4

Author: dg

src/Framework/FileMock.php

@@ -164,7 +164,7 @@ public function stream_truncate(int $size): bool
 
 	public function stream_set_option(int $option, int $arg1, int $arg2): bool
 	{
-		return true;
+		return false;
 	}
 
 

src/Framework/FileMutator.php

@@ -169,8 +169,9 @@ public function stream_seek(int $offset, int $whence = SEEK_SET): bool
 	}
 
 
-	public function stream_set_option(int $option, int $arg1, int $arg2)
+	public function stream_set_option(int $option, int $arg1, int $arg2): bool
 	{
+		return false;
 	}
 
 
@@ -192,7 +193,7 @@ public function stream_truncate(int $newSize): bool
 	}
 
 
-	public function stream_write(string $data): int
+	public function stream_write(string $data)
 	{
 		return fwrite($this->handle, $data);
 	}