added tests that mimic the #[should_panic] cargo test feature

Cargo.toml

@@ -8,6 +8,10 @@ name = "totos"
 test = true
 bench = false
 
+[[test]]
+name = "should_panic"
+harness = false
+
 [profile.dev]
 panic = "abort" # disable stack unwinding on panic
 

tests/should_panic.rs

@@ -0,0 +1,25 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+use totos::{exit_qemu, serial_print, serial_println, QemuExitCode};
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _start() -> ! {
+    should_fail();
+    serial_println!("[test did not panic]");
+    exit_qemu(QemuExitCode::Failed);
+    loop{}
+}
+
+fn should_fail() {
+    serial_print!("should_panic::should_fail...\t");
+    assert_eq!(0, 1);
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    serial_println!("[ok]");
+    exit_qemu(QemuExitCode::Success);
+    loop {}
+}