Ensure each Civilisation only ever has one server open

CHANGELOG.md

@@ -9,7 +9,7 @@
 
 ## Unreleased
 
-* No changes (CI release improvements)
+* Ensure only one hosting server exists at a time within a test context. A server hosted in a previous step will now be closed when starting another.
 
 ## v0.17.1 (April 1, 2026)
 

toolproof/src/civilization.rs

@@ -37,13 +37,8 @@ pub struct Civilization<'u> {
 }
 
 impl<'u> Civilization<'u> {
-    pub async fn shutdown(self) {
-        for handle in &self.handles {
-            handle.stop(false).await;
-        }
-        for thread in &self.threads {
-            thread.abort();
-        }
+    pub async fn shutdown(mut self) {
+        self.stop_servers().await;
 
         if let Some(BrowserWindow::Chrome(window)) = self.window {
             window
@@ -55,6 +50,16 @@ impl<'u> Civilization<'u> {
 }
 
 impl<'u> Civilization<'u> {
+    pub async fn stop_servers(&mut self) {
+        for handle in self.handles.drain(..) {
+            handle.stop(false).await;
+        }
+        for thread in self.threads.drain(..) {
+            thread.abort();
+        }
+        self.purge_port();
+    }
+
     pub fn ensure_port(&mut self) -> u16 {
         if self.assigned_server_port.is_none() {
             self.assigned_server_port = pick_unused_port();

toolproof/src/definitions/hosting/mod.rs

@@ -14,6 +14,8 @@ mod host_dir {
     use super::*;
 
     async fn host(dir: &String, civ: &mut Civilization<'_>) -> Result<(), ToolproofStepError> {
+        civ.stop_servers().await;
+
         let mut attempts = 0;
         let mut running = false;
         while !running && attempts < 5 {

toolproof/test_suite/browser/serve_twice.toolproof.yml

@@ -0,0 +1,25 @@
+name: Browser can serve a directory twice in one test
+
+steps:
+  - step: I have a "my_test.toolproof.yml" file with the content {yaml}
+    yaml: |-
+      name: Inner serve twice test
+
+      steps:
+        - I have a "public/index.html" file with the content "<p>First</p>"
+        - I serve the directory "public"
+        - In my browser, I load "/"
+        - step: In my browser, I evaluate {js}
+          js: |-
+            toolproof.assert_eq(document.querySelector("p").innerText, "First");
+        - I have a "public2/index.html" file with the content "<p>Second</p>"
+        - I serve the directory "public2"
+        - In my browser, I load "/"
+        - step: In my browser, I evaluate {js}
+          js: |-
+            toolproof.assert_eq(document.querySelector("p").innerText, "Second");
+  - I run "%toolproof_path% --timeout 60"
+  - step: "stdout should contain 'Total passing tests: 1'"
+  - step: "stdout should contain 'Failing tests: 0'"
+  - step: "stdout should contain 'All tests passed'"
+  - stderr should be empty