diff --git a/dist/src/stryker-setup.js b/dist/src/stryker-setup.js
index aecfacbe47b285c272c47e54b3d66a716adfdc41..a6864060e466a4dde49f6d32d9fa8bc8e416baaa 100644
--- a/dist/src/stryker-setup.js
+++ b/dist/src/stryker-setup.js
@@ -57,13 +57,17 @@ else {
 }
 // Stryker disable all: this file is copied to the sandbox dir
 function collectTestName({ name, suite, }) {
+    // Vitest 5 joins a test's full name with " > " and matches
+    // testNamePattern against that; a space-joined name matched nothing under
+    // a describe block, so every such test was skipped in mutant runs. The
+    // file task ends the chain and is not part of the name.
     const nameParts = [name];
     let currentSuite = suite;
-    while (currentSuite) {
+    while (currentSuite && currentSuite.file !== currentSuite) {
         nameParts.unshift(currentSuite.name);
         currentSuite = currentSuite.suite;
     }
-    return nameParts.join(' ').trim();
+    return nameParts.filter(Boolean).join(' > ').trim();
 }
 function toRawTestId(test) {
     return `${test.file?.filepath ?? 'unknown.js'}#${collectTestName(test)}`;
diff --git a/dist/src/test-helpers.js b/dist/src/test-helpers.js
index 56cc786f30c524ae18ce87eef1a67fdf26b703c5..1ad0552d5764d6b8c1ff2215e2e6fb49d7f6bc83 100644
--- a/dist/src/test-helpers.js
+++ b/dist/src/test-helpers.js
@@ -2,13 +2,17 @@
 // This file is used from the testing environment (via stryker-setup.js) and thus could be loaded into the browser (when using vitest with browser mode).
 // Thus we should avoid unnecessary dependencies in this file.
 export function collectTestName({ name, suite, }) {
+    // Vitest 5 joins a test's full name with " > " and matches
+    // testNamePattern against that; a space-joined name matched nothing under
+    // a describe block, so every such test was skipped in mutant runs. The
+    // file task ends the chain and is not part of the name.
     const nameParts = [name];
     let currentSuite = suite;
-    while (currentSuite) {
+    while (currentSuite && currentSuite.file !== currentSuite) {
         nameParts.unshift(currentSuite.name);
         currentSuite = currentSuite.suite;
     }
-    return nameParts.join(' ').trim();
+    return nameParts.filter(Boolean).join(' > ').trim();
 }
 export function toRawTestId(test) {
     return `${test.file?.filepath ?? 'unknown.js'}#${collectTestName(test)}`;