1 files changed, 52 insertions, 0 deletions
diff --git a/dom/file/tests/test_createFile.js b/dom/file/tests/test_createFile.js
new file mode 100644
index 0000000000..ebda3d4dae
--- /dev/null
+++ b/dom/file/tests/test_createFile.js
@@ -0,0 +1,52 @@
+add_task(async function () {
+  do_get_profile();
+
+  let existingFile = Services.dirsvc
+    .QueryInterface(Ci.nsIProperties)
+    .get("ProfD", Ci.nsIFile);
+  existingFile.append("exists.js");
+  existingFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+
+  var outStream = Cc[
+    "@mozilla.org/network/file-output-stream;1"
+  ].createInstance(Ci.nsIFileOutputStream);
+  outStream.init(
+    existingFile,
+    0x02 | 0x08 | 0x20, // write, create, truncate
+    0o666,
+    0
+  );
+
+  var fileData = "Hello World!";
+  outStream.write(fileData, fileData.length);
+  outStream.close();
+
+  ok(existingFile.exists(), "exists.js exists");
+
+  let unknownFile = Services.dirsvc
+    .QueryInterface(Ci.nsIProperties)
+    .get("TmpD", Ci.nsIFile);
+  unknownFile.append("wow.txt");
+
+  ok(!unknownFile.exists(), unknownFile.path + " doesn't exist");
+
+  let a = await File.createFromNsIFile(existingFile, { existenceCheck: false });
+  ok(a.size != 0, "The size is correctly set");
+
+  let b = await File.createFromNsIFile(unknownFile, { existenceCheck: false });
+  ok(b.size == 0, "The size is 0 for unknown file");
+
+  let c = await File.createFromNsIFile(existingFile, { existenceCheck: true });
+  ok(c.size != 0, "The size is correctly set");
+
+  let d = await File.createFromNsIFile(unknownFile, {
+    existenceCheck: true,
+  }).then(
+    _ => true,
+    _ => false
+  );
+  ok(d === false, "Exception thrown");
+
+  existingFile.remove(true);
+  ok(!existingFile.exists(), "exists.js doesn't exist anymore");
+});