1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/gc/pretenure-object-short-then-long-lived.js b/js/src/jit-test/tests/gc/pretenure-object-short-then-long-lived.js
new file mode 100644
index 0000000000..0de2440594
--- /dev/null
+++ b/js/src/jit-test/tests/gc/pretenure-object-short-then-long-lived.js
@@ -0,0 +1,28 @@
+// Allocate many objects, changing the lifetime from short-lived to long-lived
+// and check that we recover.
+
+load(libdir + "pretenure.js");
+
+setupPretenureTest();
+
+// Phase 1: short lived.
+
+allocateObjects(nurseryCount, false);
+let { minor, major } = runTestAndCountCollections(
+  () => allocateObjects(tenuredCount, false)
+);
+
+print(`${minor} minor GCs, ${major} major GCs`);
+assertEq(minor >= 5, true);
+assertEq(major == 0, true);
+
+// Phase 2: long lived.
+
+allocateObjects(tenuredCount, true);
+({ minor, major } = runTestAndCountCollections(
+  () => allocateObjects(tenuredCount * 5, true)
+));
+
+print(`${minor} minor GCs, ${major} major GCs`);
+assertEq(minor <= 1, true);
+assertEq(major >= 5, true);