diff --git a/kernel/syscall/mod.rs b/kernel/syscall/mod.rs
index 5c26941..2107d4f 100644
--- a/kernel/syscall/mod.rs
+++ b/kernel/syscall/mod.rs
@@ -12,7 +12,7 @@ pub mod fs;
 pub mod process;
 
 /// System call list
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum Call {
     /// Exit syscall
     Exit,
@@ -47,7 +47,7 @@ impl From<usize> for Call {
 }
 
 /// The error number for an invalid value
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum Error {
     /// Operation not permitted
     NotPermitted,
diff --git a/kernel/tests/mod.rs b/kernel/tests/mod.rs
index 3603cde..fa55c4d 100644
--- a/kernel/tests/mod.rs
+++ b/kernel/tests/mod.rs
@@ -1,5 +1,7 @@
 use arch::interrupt::{enable_interrupts, halt};
 
+use syscall;
+
 #[test]
 fn halt_with_interrupts() {
     unsafe {
@@ -7,3 +9,23 @@ fn halt_with_interrupts() {
         halt();
     }
 }
+
+#[test]
+fn open_stdio() {
+    // Test opening stdin
+    assert_eq!(syscall::open(b"debug:", 0), Ok(0));
+
+    // Test opening stdout
+    assert_eq!(syscall::open(b"debug:", 0), Ok(1));
+
+    // Test opening stderr
+    assert_eq!(syscall::open(b"debug:", 0), Ok(2));
+
+    // Test writing stdout
+    let stdout_str = b"STDOUT";
+    assert_eq!(syscall::write(1, stdout_str), Ok(stdout_str.len()));
+
+    // Test writing stderr
+    let stderr_str = b"STDERR";
+    assert_eq!(syscall::write(2, stderr_str), Ok(stderr_str.len()));
+}