migrations/egui
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Add Harness::spawn_eframe_app (#8120)

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This lets you start up the test app from within the test itself, which
can be very useful when you have a specific test scenario set up that
you need to debug.

### Related
* Previous attempt: https://github.com/emilk/egui/pull/5418

### macOS
On macOS, you may only run UIs on the main loop, so you need a few
additional steps. Not ideal, but works!


```diff
diff --git a/crates/egui_demo_app/Cargo.toml b/crates/egui_demo_app/Cargo.toml
index f9a153268..4e0cc14ee 100644
--- a/crates/egui_demo_app/Cargo.toml
+++ b/crates/egui_demo_app/Cargo.toml
@@ -84,3 +84,7 @@ web-sys.workspace = true
 
 [dev-dependencies]
 egui_kittest = { workspace = true, features = ["eframe", "snapshot", "wgpu"] }
+
+[[test]]
+name = "test_demo_app"
+harness = false
diff --git a/crates/egui_demo_app/tests/test_demo_app.rs b/crates/egui_demo_app/tests/test_demo_app.rs
index e083c8455..7ad9ed516 100644
--- a/crates/egui_demo_app/tests/test_demo_app.rs
+++ b/crates/egui_demo_app/tests/test_demo_app.rs
@@ -4,7 +4,10 @@ use egui_demo_app::{Anchor, WrapApp};
 use egui_kittest::SnapshotResults;
 use egui_kittest::kittest::Queryable as _;
 
-#[test]
+fn main() {
+    test_demo_app();
+}
+
 fn test_demo_app() {
     let mut harness = egui_kittest::Harness::builder()
         .with_size(Vec2::new(900.0, 600.0))
@@ -73,5 +76,8 @@ fn test_demo_app() {
         harness.run_steps(4);
 
         results.add(harness.try_snapshot(anchor.to_string()));
+
+        harness.spawn_eframe_app();
+        break;
     }
 }
```
This commit is contained in:
Emil Ernerfeldt
2026-04-20 14:07:45 +02:00
committed by GitHub
parent d7e55b8381
commit 56aabda7b3
10 changed files with 192 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
crates/eframe/src/lib.rs
View File

@@ -257,8 +257,27 @@ pub mod icon_data;
#[cfg(any(feature = "glow", feature = "wgpu_no_default_features"))]
#[allow(clippy::allow_attributes, clippy::needless_pass_by_value)]
pub fn run_native(
app_name: &str,
native_options: NativeOptions,
app_creator: AppCreator<'_>,
) -> Result {
run_native_ext(app_name, native_options, None, app_creator)
}
/// Like [`run_native`], but lets you supply a pre-existing [`egui::Context`].
///
/// If `egui_ctx` is `Some`, that context will be used by eframe instead of creating a fresh one.
/// If it is `None`, eframe creates a new context (same behavior as [`run_native`]).
///
/// # Errors
/// This function can fail if we fail to set up a graphics context.
#[cfg(not(target_arch = "wasm32"))]
#[cfg(any(feature = "glow", feature = "wgpu_no_default_features"))]
#[allow(clippy::allow_attributes, clippy::needless_pass_by_value)]
pub fn run_native_ext(
app_name: &str,
mut native_options: NativeOptions,
egui_ctx: Option<egui::Context>,
app_creator: AppCreator<'_>,
) -> Result {
let renderer = init_native(app_name, &mut native_options);
@@ -267,13 +286,13 @@ pub fn run_native(
#[cfg(feature = "glow")]
Renderer::Glow => {
log::debug!("Using the glow renderer");
native::run::run_glow(app_name, native_options, app_creator)
native::run::run_glow(app_name, native_options, egui_ctx, app_creator)
}
#[cfg(feature = "wgpu_no_default_features")]
Renderer::Wgpu => {
log::debug!("Using the wgpu renderer");
native::run::run_wgpu(app_name, native_options, app_creator)
native::run::run_wgpu(app_name, native_options, egui_ctx, app_creator)
}
}
}