The Tor Browser / file comparison
comparison: browser/components/sessionstore/test/browser_833286_atomic_backup.js
browser/components/sessionstore/test/browser_833286_atomic_backup.js
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| 1 /* Any copyright is dedicated to the Public Domain. | |
| 2 http://creativecommons.org/publicdomain/zero/1.0/ */ | |
| 3 | |
| 4 // This tests are for a sessionstore.js atomic backup. | |
| 5 // Each test will wait for a write to the Session Store | |
| 6 // before executing. | |
| 7 | |
| 8 let tmp = {}; | |
| 9 Cu.import("resource://gre/modules/osfile.jsm", tmp); | |
| 10 Cu.import("resource:///modules/sessionstore/SessionFile.jsm", tmp); | |
| 11 | |
| 12 const {OS, SessionFile} = tmp; | |
| 13 | |
| 14 const PREF_SS_INTERVAL = "browser.sessionstore.interval"; | |
| 15 // Full paths for sessionstore.js and sessionstore.bak. | |
| 16 const path = OS.Path.join(OS.Constants.Path.profileDir, "sessionstore.js"); | |
| 17 const backupPath = OS.Path.join(OS.Constants.Path.profileDir, | |
| 18 "sessionstore.bak"); | |
| 19 | |
| 20 // A text decoder. | |
| 21 let gDecoder = new TextDecoder(); | |
| 22 // Global variables that contain sessionstore.js and sessionstore.bak data for | |
| 23 // comparison between tests. | |
| 24 let gSSData; | |
| 25 let gSSBakData; | |
| 26 | |
| 27 | |
| 28 | |
| 29 add_task(function* testAfterFirstWrite() { | |
| 30 // Ensure sessionstore.bak is not created. We start with a clean | |
| 31 // profile so there was nothing to move to sessionstore.bak before | |
| 32 // initially writing sessionstore.js | |
| 33 let ssExists = yield OS.File.exists(path); | |
| 34 let ssBackupExists = yield OS.File.exists(backupPath); | |
| 35 ok(ssExists, "sessionstore.js should exist."); | |
| 36 ok(!ssBackupExists, "sessionstore.bak should not have been created, yet"); | |
| 37 | |
| 38 // Save sessionstore.js data to compare to the sessionstore.bak data in the | |
| 39 // next test. | |
| 40 let array = yield OS.File.read(path); | |
| 41 gSSData = gDecoder.decode(array); | |
| 42 | |
| 43 // Manually move to the backup since the first write has already happened | |
| 44 // and a backup would not be triggered again. | |
| 45 yield OS.File.move(path, backupPath); | |
| 46 | |
| 47 yield forceSaveState(); | |
| 48 }); | |
| 49 | |
| 50 add_task(function* testReadBackup() { | |
| 51 // Ensure sessionstore.bak is finally created. | |
| 52 let ssExists = yield OS.File.exists(path); | |
| 53 let ssBackupExists = yield OS.File.exists(backupPath); | |
| 54 ok(ssExists, "sessionstore.js exists."); | |
| 55 ok(ssBackupExists, "sessionstore.bak should now be created."); | |
| 56 | |
| 57 // Read sessionstore.bak data. | |
| 58 let array = yield OS.File.read(backupPath); | |
| 59 gSSBakData = gDecoder.decode(array); | |
| 60 | |
| 61 // Make sure that the sessionstore.bak is identical to the last | |
| 62 // sessionstore.js. | |
| 63 is(gSSBakData, gSSData, "sessionstore.js is backed up correctly."); | |
| 64 | |
| 65 // Read latest sessionstore.js. | |
| 66 array = yield OS.File.read(path); | |
| 67 gSSData = gDecoder.decode(array); | |
| 68 | |
| 69 // Read sessionstore.js with SessionFile.read. | |
| 70 let ssDataRead = yield SessionFile.read(); | |
| 71 is(ssDataRead, gSSData, "SessionFile.read read sessionstore.js correctly."); | |
| 72 | |
| 73 // Remove sessionstore.js to test fallback onto sessionstore.bak. | |
| 74 yield OS.File.remove(path); | |
| 75 ssExists = yield OS.File.exists(path); | |
| 76 ok(!ssExists, "sessionstore.js should be removed now."); | |
| 77 | |
| 78 // Read sessionstore.bak with SessionFile.read. | |
| 79 ssDataRead = yield SessionFile.read(); | |
| 80 is(ssDataRead, gSSBakData, | |
| 81 "SessionFile.read read sessionstore.bak correctly."); | |
| 82 | |
| 83 yield forceSaveState(); | |
| 84 }); | |
| 85 | |
| 86 add_task(function* testBackupUnchanged() { | |
| 87 // Ensure sessionstore.bak is backed up only once. | |
| 88 | |
| 89 // Read sessionstore.bak data. | |
| 90 let array = yield OS.File.read(backupPath); | |
| 91 let ssBakData = gDecoder.decode(array); | |
| 92 // Ensure the sessionstore.bak did not change. | |
| 93 is(ssBakData, gSSBakData, "sessionstore.bak is unchanged."); | |
| 94 }); | |
| 95 | |
| 96 add_task(function* cleanup() { | |
| 97 // Cleaning up after the test: removing the sessionstore.bak file. | |
| 98 yield OS.File.remove(backupPath); | |
| 99 }); |
