1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testSABAccounting.cpp b/js/src/jsapi-tests/testSABAccounting.cpp
new file mode 100644
index 0000000000..38607bc0aa
--- /dev/null
+++ b/js/src/jsapi-tests/testSABAccounting.cpp
@@ -0,0 +1,31 @@
+#include "builtin/TestingFunctions.h"
+#include "js/SharedArrayBuffer.h"
+#include "jsapi-tests/tests.h"
+
+BEGIN_TEST(testSABAccounting) {
+  // Purge what we can
+  JS::PrepareForFullGC(cx);
+  NonIncrementalGC(cx, JS::GCOptions::Shrink, JS::GCReason::API);
+
+  // Self-hosting and chrome code should not use SABs, or the point of this
+  // predicate is completely lost.
+  CHECK(!JS::ContainsSharedArrayBuffer(cx));
+
+  JS::RootedObject obj(cx), obj2(cx);
+  CHECK(obj = JS::NewSharedArrayBuffer(cx, 4096));
+  CHECK(JS::ContainsSharedArrayBuffer(cx));
+  CHECK(obj2 = JS::NewSharedArrayBuffer(cx, 4096));
+  CHECK(JS::ContainsSharedArrayBuffer(cx));
+
+  // Discard those objects again.
+  obj = nullptr;
+  obj2 = nullptr;
+  JS::PrepareForFullGC(cx);
+  NonIncrementalGC(cx, JS::GCOptions::Shrink, JS::GCReason::API);
+
+  // Should be back to base state.
+  CHECK(!JS::ContainsSharedArrayBuffer(cx));
+
+  return true;
+}
+END_TEST(testSABAccounting)