1 files changed, 72 insertions, 0 deletions
diff --git a/testing/web-platform/tests/IndexedDB/transaction-scheduling-across-connections.any.js b/testing/web-platform/tests/IndexedDB/transaction-scheduling-across-connections.any.js
new file mode 100644
index 0000000000..06d886fe83
--- /dev/null
+++ b/testing/web-platform/tests/IndexedDB/transaction-scheduling-across-connections.any.js
@@ -0,0 +1,72 @@
+// META: script=resources/support.js
+
+indexeddb_test(
+  (t, db) => {
+    const store = db.createObjectStore('store');
+  },
+
+  (t, db1) => {
+    // Open a second connection to the same database.
+    const open_request = indexedDB.open(db1.name);
+    open_request.onerror = t.unreached_func('open() should succeed');
+    open_request.onupgradeneeded =
+      t.unreached_func('second connection should not upgrade');
+    open_request.onsuccess = t.step_func(() => {
+      const db2 = open_request.result;
+      t.add_cleanup(() => { db2.close(); });
+
+      const transaction1 = db1.transaction('store', 'readwrite', {durability: 'relaxed'});
+      transaction1.onabort = t.unreached_func('transaction1 should complete');
+
+      const transaction2 = db2.transaction('store', 'readwrite', {durability: 'relaxed'});
+      transaction2.onabort = t.unreached_func('transaction2 should complete');
+
+      let transaction1PutSuccess = false;
+      let transaction1Complete = false;
+      let transaction2PutSuccess = false;
+
+      // Keep transaction1 alive for a while and ensure transaction2
+      // doesn't start.
+
+      let count = 0;
+      (function doTransaction1Put() {
+        const request = transaction1.objectStore('store').put(1, count++);
+        request.onerror = t.unreached_func('request should succeed');
+        request.onsuccess = t.step_func(evt => {
+          transaction1PutSuccess = true;
+          if (count < 5) {
+            doTransaction1Put();
+          }
+        });
+      }());
+
+      transaction1.oncomplete = t.step_func(evt => {
+        transaction1Complete = true;
+        assert_false(
+          transaction2PutSuccess,
+          'transaction1 should complete before transaction2 put succeeds');
+      });
+
+      const request = transaction2.objectStore('store').put(2, 0);
+      request.onerror = t.unreached_func('request should succeed');
+      request.onsuccess = t.step_func(evt => {
+        transaction2PutSuccess = true;
+        assert_true(
+          transaction1Complete,
+          'transaction2 put should not succeed before transaction1 completes');
+      });
+
+      transaction2.oncomplete = t.step_func_done(evt => {
+        assert_true(
+          transaction1PutSuccess,
+          'transaction1 put should succeed before transaction2 runs');
+        assert_true(
+          transaction1Complete,
+          'transaction1 should complete before transaction2 runs');
+        assert_true(
+          transaction2PutSuccess,
+          'transaction2 put should succeed before transaction2 completes');
+      });
+    });
+  },
+  "Check that readwrite transactions with overlapping scopes do not run in parallel.");