1 files changed, 62 insertions, 0 deletions
diff --git a/dom/fetch/tests/browser_blobFromFile.js b/dom/fetch/tests/browser_blobFromFile.js
new file mode 100644
index 0000000000..155f420477
--- /dev/null
+++ b/dom/fetch/tests/browser_blobFromFile.js
@@ -0,0 +1,62 @@
+add_task(async function test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.tabs.remote.separateFileUriProcess", true]],
+  });
+
+  let fileData = "";
+  for (var i = 0; i < 100; ++i) {
+    fileData += "hello world!";
+  }
+
+  let file = Cc["@mozilla.org/file/directory_service;1"]
+    .getService(Ci.nsIDirectoryService)
+    .QueryInterface(Ci.nsIProperties)
+    .get("ProfD", Ci.nsIFile);
+  file.append("file.txt");
+  file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+
+  let outStream = Cc[
+    "@mozilla.org/network/file-output-stream;1"
+  ].createInstance(Ci.nsIFileOutputStream);
+  outStream.init(
+    file,
+    0x02 | 0x08 | 0x20, // write, create, truncate
+    0666,
+    0
+  );
+  outStream.write(fileData, fileData.length);
+  outStream.close();
+
+  let fileHandler = Cc["@mozilla.org/network/io-service;1"]
+    .getService(Ci.nsIIOService)
+    .getProtocolHandler("file")
+    .QueryInterface(Ci.nsIFileProtocolHandler);
+
+  let fileURL = fileHandler.getURLSpecFromFile(file);
+
+  info("Opening url: " + fileURL);
+  let tab = BrowserTestUtils.addTab(gBrowser, fileURL);
+
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  let blob = await SpecialPowers.spawn(browser, [file.leafName], function(
+    fileName
+  ) {
+    return new content.window.Promise(resolve => {
+      content.window
+        .fetch(fileName)
+        .then(r => r.blob())
+        .then(blob => resolve(blob));
+    });
+  });
+
+  ok(blob instanceof File, "We have a file");
+
+  is(blob.size, file.fileSize, "The size matches");
+  is(blob.name, file.leafName, "The name is correct");
+
+  file.remove(false);
+
+  gBrowser.removeTab(tab);
+});