Merge branch 'post-07-new' into post-08-new

src/interrupts.rs

@@ -114,3 +114,14 @@ extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: &mut Interrup
             .notify_end_of_interrupt(InterruptIndex::Keyboard.as_u8());
     }
 }
+
+#[cfg(test)]
+use crate::{serial_print, serial_println};
+
+#[test_case]
+fn test_breakpoint_exception() {
+    serial_print!("test_breakpoint_exception...");
+    // invoke a breakpoint exception
+    x86_64::instructions::interrupts::int3();
+    serial_println!("[ok]");
+}