1 files changed, 72 insertions, 0 deletions
diff --git a/dom/base/test/browser_inputStream_structuredClone.js b/dom/base/test/browser_inputStream_structuredClone.js
new file mode 100644
index 0000000000..a022563ac0
--- /dev/null
+++ b/dom/base/test/browser_inputStream_structuredClone.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URIs = [
+  "about:about",
+  "http://example.com/browser/dom/base/test/empty.html",
+];
+
+async function runTest(input, url) {
+  let tab = BrowserTestUtils.addTab(gBrowser, url);
+  let browser = gBrowser.getBrowserForTab(tab);
+
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let stream = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
+    Ci.nsIStringInputStream
+  );
+  stream.setData(input, input.length);
+
+  let data = {
+    inputStream: stream,
+  };
+
+  is(
+    data.inputStream.available(),
+    input.length,
+    "The length of the inputStream matches: " + input.length
+  );
+
+  // FIXME: SpecialPowers.spawn currently crashes when trying to return
+  // values containing input streams.
+  /* eslint-disable no-shadow */
+  let dataBack = await ContentTask.spawn(browser, data, function (data) {
+    let dataBack = {
+      inputStream: data.inputStream,
+      check: true,
+    };
+
+    if (content.location.href.startsWith("about:")) {
+      dataBack.check =
+        data.inputStream instanceof
+        content.Components.interfaces.nsIInputStream;
+    }
+
+    return dataBack;
+  });
+  /* eslint-enable no-shadow */
+
+  ok(dataBack.check, "The inputStream is a nsIInputStream also on content.");
+  ok(
+    data.inputStream instanceof Ci.nsIInputStream,
+    "The original object was an inputStream"
+  );
+  ok(
+    dataBack.inputStream instanceof Ci.nsIInputStream,
+    "We have an inputStream back from the content."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async function test() {
+  let a = "a";
+  for (let i = 0; i < 25; ++i) {
+    a += a;
+  }
+
+  for (let i = 0; i < URIs.length; ++i) {
+    await runTest("Hello world", URIs[i]);
+    await runTest(a, URIs[i]);
+  }
+});