diff --git a/src/app/update/context_menu.rs b/src/app/update/context_menu.rs
index 912f8fb68..1898e04c6 100644
--- a/src/app/update/context_menu.rs
+++ b/src/app/update/context_menu.rs
@@ -389,7 +389,7 @@ impl OpenCADStudio {
 mod tests {
     use super::*;
     use crate::app::settings::RightClickMode;
-    use crate::command::{CadCommand, StepInput};
+    use crate::command::StepInput;
     use crate::ui::popup::context_menu::MenuAction;
     use glam::DVec3;
     use iced::Point;
diff --git a/src/i18n.rs b/src/i18n.rs
index 1463aef6b..5eb46ea31 100644
--- a/src/i18n.rs
+++ b/src/i18n.rs
@@ -1,7 +1,7 @@
 //! Application language selection and embedded Fluent resources.
 
 use i18n_embed::fluent::{fluent_language_loader, FluentLanguageLoader};
-#[cfg(not(target_arch = "wasm32"))]
+#[cfg(all(not(target_arch = "wasm32"), not(test)))]
 use i18n_embed::DesktopLanguageRequester;
 use i18n_embed::LanguageLoader;
 #[cfg(target_arch = "wasm32")]
@@ -163,27 +163,32 @@ fn system_languages() -> Vec<i18n_embed::unic_langid::LanguageIdentifier> {
     // for the system language, so the machine's locale must never reach
     // them — not even from a test that runs in parallel.
     #[cfg(test)]
-    return vec!["en-US".parse().expect("en-US is a valid language identifier")];
-
-    #[cfg(target_arch = "wasm32")]
-    let mut requested = WebLanguageRequester::requested_languages();
-    #[cfg(not(target_arch = "wasm32"))]
-    let requested = DesktopLanguageRequester::requested_languages();
-
-    // `navigator.languages` may be empty in privacy-restricted browser
-    // contexts. The singular preference is still exposed by mainstream
-    // browsers, so keep it as the first fallback before English.
-    #[cfg(target_arch = "wasm32")]
-    if requested.is_empty() {
-        if let Some(language) = web_sys::window()
-            .and_then(|window| window.navigator().language())
-            .and_then(|language| language.parse().ok())
-        {
-            requested.push(language);
-        }
+    {
+        vec!["en-US".parse().expect("en-US is a valid language identifier")]
     }
 
-    requested
+    #[cfg(not(test))]
+    {
+        #[cfg(target_arch = "wasm32")]
+        let mut requested = WebLanguageRequester::requested_languages();
+        #[cfg(not(target_arch = "wasm32"))]
+        let requested = DesktopLanguageRequester::requested_languages();
+
+        // `navigator.languages` may be empty in privacy-restricted browser
+        // contexts. The singular preference is still exposed by mainstream
+        // browsers, so keep it as the first fallback before English.
+        #[cfg(target_arch = "wasm32")]
+        if requested.is_empty() {
+            if let Some(language) = web_sys::window()
+                .and_then(|window| window.navigator().language())
+                .and_then(|language| language.parse().ok())
+            {
+                requested.push(language);
+            }
+        }
+
+        requested
+    }
 }
 
 fn load_language(
diff --git a/src/modules/draw/modify/fillet.rs b/src/modules/draw/modify/fillet.rs
index 5ebd86941..7a61fb05c 100644
--- a/src/modules/draw/modify/fillet.rs
+++ b/src/modules/draw/modify/fillet.rs
@@ -2411,7 +2411,7 @@ mod tests {
         assert_eq!(keywords(&command), ["P", "R"]);
         // The host hands the restored document back; the cache follows it.
         let mut doc = acadrust::CadDocument::new();
-        doc.add_entity(line(0.0, 0.0, 20.0, 0.0, 7));
+        let _ = doc.add_entity(line(0.0, 0.0, 20.0, 0.0, 7));
         command.on_document_undone(&doc);
         assert_eq!(command.all_entities.len(), 1);
         assert_eq!(command.all_entities[0].common().handle, Handle::new(7));
diff --git a/src/scene/mod.rs b/src/scene/mod.rs
index 9a86f0392..d620e553f 100644
--- a/src/scene/mod.rs
+++ b/src/scene/mod.rs
@@ -13507,7 +13507,7 @@ mod layout_cache_tests {
 
     #[test]
     fn cached_layout_names_returns_same_arc_until_bump() {
-        let mut scene = Scene::new();
+        let scene = Scene::new();
         let first = scene.cached_layout_names();
         let second = scene.cached_layout_names();
         assert!(std::sync::Arc::ptr_eq(&first, &second));
diff --git a/src/scene/pipeline/mod.rs b/src/scene/pipeline/mod.rs
index 6046ade03..5591ceb8c 100644
--- a/src/scene/pipeline/mod.rs
+++ b/src/scene/pipeline/mod.rs
@@ -5949,7 +5949,7 @@ mod highlight_classification_tests {
 
     #[test]
     fn each_wire_lands_in_the_bucket_the_old_predicate_chose() {
-        let wires = vec![plain("1"), circle("2"), ellipse("3"), plain("4")];
+        let wires = [plain("1"), circle("2"), ellipse("3"), plain("4")];
         let refs: Vec<&WireModel> = wires.iter().collect();
         let depth_map = rustc_hash::FxHashMap::default();
 
@@ -5979,7 +5979,7 @@ mod highlight_classification_tests {
     // reach the instances.
     #[test]
     fn the_colour_override_reaches_the_instances() {
-        let wires = vec![circle("2"), ellipse("3")];
+        let wires = [circle("2"), ellipse("3")];
         let refs: Vec<&WireModel> = wires.iter().collect();
         let depth_map = rustc_hash::FxHashMap::default();