refactor(kernel): extract MockPlatform and test helpers into separate modules

crates/kernel/src/tests/mock_platform.rs

@@ -0,0 +1,49 @@
+use domain::memory::MemoryRegion;
+use domain::thread::SavedContext;
+use platform::Platform;
+use types::{
+    address::{EntryPoint, StackPointer},
+    id::{CoreId, IrqId, ProcessId},
+    time::{Ticks, TimerDuration},
+};
+
+pub struct MockPlatform {
+    ticks: Ticks,
+    core: CoreId,
+    cores: u8,
+}
+
+impl MockPlatform {
+    pub fn new(num_cores: u8) -> Self {
+        Self {
+            ticks: Ticks::from_raw(0),
+            core: CoreId::from_raw(0),
+            cores: num_cores,
+        }
+    }
+
+    pub fn set_ticks(&mut self, ticks: Ticks) {
+        self.ticks = ticks;
+    }
+}
+
+impl Platform for MockPlatform {
+    fn configure_protection(&mut self, _process: ProcessId, _regions: &[MemoryRegion]) {}
+    fn context_switch(&mut self, _from: &mut SavedContext, _to: &SavedContext) {}
+    fn enable_user_mode(&mut self, _entry: EntryPoint, _stack: StackPointer) -> ! {
+        loop {}
+    }
+    fn set_timer(&mut self, _duration: TimerDuration) {}
+    fn current_ticks(&self) -> Ticks {
+        self.ticks
+    }
+    fn mask_irq(&mut self, _irq: IrqId) {}
+    fn unmask_irq(&mut self, _irq: IrqId) {}
+    fn send_ipi(&mut self, _target: CoreId) {}
+    fn core_id(&self) -> CoreId {
+        self.core
+    }
+    fn num_cores(&self) -> u8 {
+        self.cores
+    }
+}