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Test Info:
- Manifest: modules/libpref/test/unit/xpcshell.toml
/* Any copyright is dedicated to the Public Domain.
"use strict";
/**
* Tests that we can create a backup of the preferences state to
* a file asynchronously.
*/
add_task(async function test_backupPrefFile() {
// Create a backup of the preferences state to a file.
Services.prefs.setBoolPref("test.backup", true);
let backupFilePath = PathUtils.join(PathUtils.tempDir, "prefs-backup.js");
let backupFile = await IOUtils.getFile(backupFilePath);
await Services.prefs.backupPrefFile(backupFile);
// Verify that the backup file was created and contains the expected content.
let backupContent = await IOUtils.read(backupFilePath, { encoding: "utf-8" });
let sawTestValue = false;
// Now parse the backup file and verify that it contains the expected
// preference value. We'll not worry about any of the other preferences.
let observer = {
onStringPref() {},
onIntPref() {},
onBoolPref(kind, name, value, _isSticky, _isLocked) {
if (name == "test.backup" && value) {
sawTestValue = true;
}
},
onError(message) {
Assert.ok(false, "Error while parsing backup file: " + message);
},
};
Services.prefs.parsePrefsFromBuffer(backupContent, observer);
Assert.ok(
sawTestValue,
"The backup file contains the expected preference value."
);
// Clean up the backup file.
await IOUtils.remove(backupFilePath);
});