it: Add runner and common tests

Still needs some work, but the idea should be clear.

Signed-off-by: John Nunley <dev@notgull.net>

it/common-tests/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "common-tests"
+version = "0.1.0"
+rust-version.workspace = true
+repository.workspace = true
+license.workspace = true
+edition.workspace = true
+
+[dependencies]
+gui-test.workspace = true
+macro_rules_attribute = "0.2.0"
+winit.workspace = true

it/common-tests/src/main.rs

@@ -0,0 +1,21 @@
+//! Run the test.
+
+use gui_test::{test, Harness};
+use macro_rules_attribute::apply;
+
+use winit::event_loop::EventLoop;
+
+#[apply(test)]
+fn initialize(harness: &mut Harness) {
+    let _test = harness.test("startup/shutdown");
+
+    let evl = EventLoop::new().unwrap();
+    evl.run(|_event, elwt| {
+        elwt.exit();
+    })
+    .unwrap();
+}
+
+gui_test::main! {
+    gui_test::remote::handler()
+}