diff --git a/Cargo.toml b/Cargo.toml
index 8d248db68..cd30ed328 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -264,7 +264,9 @@ name = "window"
 resolver = "2"
 members = [
     "dpi",
+    "it/common-tests",
     "it/gui-test",
+    "it/gui-test-runner",
     "run-wasm",
 ]
 
@@ -279,3 +281,4 @@ async-io = "2.3.1"
 gui-test = { path = "it/gui-test" }
 mint = "0.5.6"
 serde = { version = "1", features = ["serde_derive"] }
+winit = { path = "." }
diff --git a/it/common-tests/Cargo.toml b/it/common-tests/Cargo.toml
new file mode 100644
index 000000000..5cf9a765d
--- /dev/null
+++ b/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
diff --git a/it/common-tests/src/main.rs b/it/common-tests/src/main.rs
new file mode 100644
index 000000000..c3dab0e5d
--- /dev/null
+++ b/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()
+}
diff --git a/it/gui-test-runner/Cargo.toml b/it/gui-test-runner/Cargo.toml
new file mode 100644
index 000000000..2eeb4dbe4
--- /dev/null
+++ b/it/gui-test-runner/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "gui-test-runner"
+version = "0.1.0"
+rust-version.workspace = true
+repository.workspace = true
+license.workspace = true
+edition.workspace = true
+
+[dependencies]
diff --git a/it/gui-test-runner/src/main.rs b/it/gui-test-runner/src/main.rs
new file mode 100644
index 000000000..48cdb199f
--- /dev/null
+++ b/it/gui-test-runner/src/main.rs
@@ -0,0 +1,59 @@
+//! Runner for the `gui-test` system.
+
+use std::env;
+use std::process::{Command, Stdio};
+
+fn main() {
+    let mut args = env::args();
+
+    // Get the test crate name.
+    let test_crate = args.nth(1).unwrap();
+
+    // Get the target.
+    let target_tag = args.next().unwrap();
+
+    // Split the target into the target and the tag.
+    let (target, tag) = {
+        let mut split = target_tag.splitn(1, ':');
+        let target = split.next().unwrap();
+        let tag = split.next();
+        (target, tag)
+    };
+
+    // Get the current target.
+    let current_target = current_target();
+
+    // For now, we only support building for the current target.
+    assert_eq!(target, current_target);
+    assert!(tag.is_none());
+
+    // Just run the crate.
+    if !Command::new("cargo")
+        .args(["run", "-p", &test_crate])
+        .output()
+        .unwrap()
+        .status
+        .success()
+    {
+        panic!("test failed");
+    }
+}
+
+/// Get the current target.
+fn current_target() -> String {
+    let output = Command::new("rustc")
+        .arg("-vV")
+        .stdout(Stdio::piped())
+        .output()
+        .unwrap();
+
+    // Look for the line that starts with "host".
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    for line in stdout.lines() {
+        if let Some(host) = line.strip_prefix("host: ") {
+            return host.to_string();
+        }
+    }
+
+    panic!("failed to find host: line in rustc output")
+}
diff --git a/it/gui-test/src/lib.rs b/it/gui-test/src/lib.rs
index 880b98354..6a4e75b80 100644
--- a/it/gui-test/src/lib.rs
+++ b/it/gui-test/src/lib.rs
@@ -1,7 +1,7 @@
 //! A testing framework that can be run remotely.
 
-pub mod stream;
 pub mod remote;
+pub mod stream;
 pub mod user;
 
 use serde::{Deserialize, Serialize};
@@ -23,7 +23,7 @@ pub use inventory as __inventory;
 macro_rules! main {
     ($handler:expr) => {
         fn main() {
-            $crate::__entry($harness)
+            $crate::__entry($handler)
         }
     };
 }
@@ -62,7 +62,7 @@ pub struct __TestStart {
 impl __TestStart {
     /// Create a new test start.
     #[doc(hidden)]
-    pub fn __new(name: &'static str, func: fn(&mut Harness)) -> Self {
+    pub const fn __new(name: &'static str, func: fn(&mut Harness)) -> Self {
         Self { name, func }
     }
 }
@@ -290,6 +290,12 @@ pub trait TestHandler {
     fn handle_test(&mut self, event: TestEvent);
 }
 
+impl<T: TestHandler + ?Sized> TestHandler for Box<T> {
+    fn handle_test(&mut self, event: TestEvent) {
+        (**self).handle_test(event)
+    }
+}
+
 /// An event produced by the test harness.
 #[derive(Debug, Serialize, Deserialize)]
 pub struct TestEvent {
diff --git a/it/gui-test/src/remote.rs b/it/gui-test/src/remote.rs
index 37154ce55..3316ef3f7 100644
--- a/it/gui-test/src/remote.rs
+++ b/it/gui-test/src/remote.rs
@@ -1,8 +1,8 @@
 //! Create a test handler that can be run remotely.
 
-use crate::TestHandler;
 use crate::stream::WriteHandler;
 use crate::user::UserHandler;
+use crate::TestHandler;
 
 use std::env;
 use std::net::TcpStream;
@@ -11,16 +11,17 @@ use std::net::TcpStream;
 pub fn handler() -> Box<dyn TestHandler + Send + 'static> {
     // If GUI_TEST_UNIX_STREAM is enabled, use that as a Unix stream.
     #[cfg(unix)]
-    if let Some(stream_path) = env::var_os("GUI_TEST_UNIX_STREAM")
-        .filter(|s| !s.is_empty()) {
-        let stream = std::os::unix::net::UnixStream::connect(stream_path).expect("unable to connect to gui-test handler");
+    if let Some(stream_path) = env::var_os("GUI_TEST_UNIX_STREAM").filter(|s| !s.is_empty()) {
+        let stream = std::os::unix::net::UnixStream::connect(stream_path)
+            .expect("unable to connect to gui-test handler");
         return Box::new(WriteHandler::new(stream));
     }
 
     // If GUI_TEST_TCP_STREAM is enabled, use that as a TCP stream.
     if let Some(tcp_ip) = env::var("GUI_TEST_TCP_STREAM")
         .ok()
-        .filter(|s| !s.is_empty()) {
+        .filter(|s| !s.is_empty())
+    {
         let stream = TcpStream::connect(tcp_ip).unwrap();
         return Box::new(WriteHandler::new(stream));
     }
diff --git a/it/gui-test/src/stream.rs b/it/gui-test/src/stream.rs
index 18bf64d3f..f8fbeaa00 100644
--- a/it/gui-test/src/stream.rs
+++ b/it/gui-test/src/stream.rs
@@ -1,5 +1,5 @@
 //! Write events to an output stream.
-//! 
+//!
 //! The format is as follows:
 //! - First 8 bytes: big-endian length of payload.
 //! - Next {len} bytes: JSON payload to deserialize from.
@@ -16,9 +16,7 @@ pub struct WriteHandler<W> {
 impl<W: Write> WriteHandler<W> {
     /// Create a new write handler.
     pub fn new(writer: W) -> Self {
-        Self {
-            writer
-        }
+        Self { writer }
     }
 }