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diff --git a/comm/mailnews/base/test/unit/test_testsuite_base64.js b/comm/mailnews/base/test/unit/test_testsuite_base64.js
new file mode 100644
index 0000000000..a6faae3640
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+++ b/comm/mailnews/base/test/unit/test_testsuite_base64.js
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+/**
+ * Tests functions atob() and btoa() in mailnews/test/resources/MailTestUtils.jsm .
+ *
+ * Note:
+ * btoa() = base64 encode
+ * atob() = base64 decode
+ * (i.e. "binary" = plain, and "ascii" = encoded)
+ */
+
+function run_test() {
+  var plain = "testtesttest";
+  var encoded = "dGVzdHRlc3R0ZXN0";
+
+  // correct encoding according to spec
+  Assert.equal(btoa(plain), encoded); // encode
+  Assert.equal(atob(encoded), plain); // decode
+
+  // roundtrip works
+  Assert.equal(atob(btoa(plain)), plain);
+  Assert.equal(btoa(atob(encoded)), encoded);
+  return true;
+}