it: test subsurface positioning

src/it/test_ifs/test_subcompositor.rs

@@ -0,0 +1,60 @@
+use {
+    crate::{
+        it::{
+            test_error::TestError, test_ifs::test_subsurface::TestSubsurface,
+            test_object::TestObject, test_transport::TestTransport,
+        },
+        wire::{wl_subcompositor::*, WlSubcompositorId, WlSurfaceId},
+    },
+    std::{cell::Cell, rc::Rc},
+};
+
+pub struct TestSubcompositor {
+    pub id: WlSubcompositorId,
+    pub tran: Rc<TestTransport>,
+    pub destroyed: Cell<bool>,
+}
+
+impl TestSubcompositor {
+    pub fn destroy(&self) -> Result<(), TestError> {
+        if !self.destroyed.replace(true) {
+            self.tran.send(Destroy { self_id: self.id })?;
+        }
+        Ok(())
+    }
+
+    pub async fn get_subsurface(
+        &self,
+        surface: WlSurfaceId,
+        parent: WlSurfaceId,
+    ) -> Result<Rc<TestSubsurface>, TestError> {
+        let id = self.tran.id();
+        self.tran.send(GetSubsurface {
+            self_id: self.id,
+            id,
+            surface,
+            parent,
+        })?;
+        self.tran.sync().await;
+        let ss = Rc::new(TestSubsurface {
+            id,
+            tran: self.tran.clone(),
+            destroyed: Cell::new(false),
+            server: self.tran.get_object(id)?,
+        });
+        self.tran.add_obj(ss.clone())?;
+        Ok(ss)
+    }
+}
+
+impl Drop for TestSubcompositor {
+    fn drop(&mut self) {
+        let _ = self.destroy();
+    }
+}
+
+test_object! {
+    TestSubcompositor, WlSubcompositor;
+}
+
+impl TestObject for TestSubcompositor {}