1 files changed, 27 insertions, 0 deletions
diff --git a/toolkit/components/osfile/tests/xpcshell/test_osfile_writeAtomic_zerobytes.js b/toolkit/components/osfile/tests/xpcshell/test_osfile_writeAtomic_zerobytes.js
new file mode 100644
index 000000000..a32a690e6
--- /dev/null
+++ b/toolkit/components/osfile/tests/xpcshell/test_osfile_writeAtomic_zerobytes.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+var SHARED_PATH;
+
+add_task(function* init() {
+  do_get_profile();
+  SHARED_PATH = OS.Path.join(OS.Constants.Path.profileDir, "test_osfile_write_zerobytes.tmp");
+});
+
+add_test_pair(function* test_osfile_writeAtomic_zerobytes() {
+  let encoder = new TextEncoder();
+  let string1 = "";
+  let outbin = encoder.encode(string1);
+  yield OS.File.writeAtomic(SHARED_PATH, outbin);
+
+  let decoder = new TextDecoder();
+  let bin = yield OS.File.read(SHARED_PATH);
+  let string2 = decoder.decode(bin);
+  // Checking if writeAtomic supports writing encoded zero-byte strings
+  Assert.equal(string2, string1, "Read the expected (empty) string.");
+});
+
+function run_test() {
+  run_next_test();
+}
+\ No newline at end of file