Add helper function to fake Kernel

unittest/src/fake/kernel.rs

@@ -108,6 +108,20 @@ impl Kernel {
  pub fn take_syscall_log(&self) -> Vec<SyscallLogEntry> {
  with_kernel_data(|kernel_data| std::mem::take(&mut kernel_data.unwrap().syscall_log))
  }
+
+ /// Returns true if the specified driver installed.
+ pub fn is_driver_present(driver_num: u32) -> bool {
+ with_kernel_data(|kernel_data| {
+ kernel_data.map_or(false, |kernel| kernel.drivers.contains_key(&driver_num))
+ })
+ }
+
+ /// Returns true if there are any pending upcalls.
+ pub fn is_upcall_pending() -> bool {
+ with_kernel_data(|kernel_data| {
+ kernel_data.map_or(false, |kernel| !kernel.upcall_queue.is_empty())
+ })
+ }
 }
 
 impl Drop for Kernel {