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Test strategy

Exploratory tests

These tests are intended to verify that the extension subjectively behaves as expected without disrupting normal functionality of the site.

It is recommended to perform these tests with "Show thumbnail hashes" enabled in the extension settings, as this helps to verify that the extension is working even when there are no duplicates on the page.

  1. Front page

    1. Navigate to https://old.reddit.com/.

    2. Verify that the page functions as usual.

    3. Open the console, filter to rededup.js and verify that there are no errors. There should be two log messages: "Processing X links" and "No duplicates found" or "Found Y items with Z total duplicates".

    4. If there are any duplicates (unlikely for the front page), verify that the duplicate show/hide behavior works as expected.

  2. Subreddit

    1. Navigate to a subreddit page.

    2. Repeat the steps for the front page.

  3. Multireddit

    1. Navigate to a multireddit that contains duplicate posts, such as https://old.reddit.com/r/illustration+drawing or https://old.reddit.com/r/news+worldnews.

    2. Repeat the steps for the front page.

  4. User page

    1. Find a user with duplicate posts (look on art-related subs like /r/IDAP or /r/Illustration).

    2. Verify that duplicates are handled as expected on the user's overview page and submissions page.

    3. Verify that the user comments page works as usual (log message "No links found").

  5. Post comments

    1. Find a link that has been posted more than once (look on /r/news or similar).

    2. Navigate to the post comments and verify the page works as usual. (The extension should log "Single page" and not process the page further.)

    3. Click on the "Other Discussions" tab and verify that the page works as usual. The extension should log "Other Discussions page" and not process any links.

  6. Search page

    1. Navigate to https://old.reddit.com/search and enter a search that will likely produce duplicates (e.g. a top headline from /r/news).

    2. Verify that the search page functions as expected.

    3. Verify that duplicates are coalesced as expected.

  7. Legacy search page

    1. Navigate to https://old.reddit.com/search?feature=legacy_search and enter a search that will likely produce duplicates (e.g. a top headline from /r/news).

    2. Verify that the search page functions as expected.

    3. Verify that duplicates are coalesced as expected.

  8. Never Ending Reddit

    1. Install the Reddit Enhancement Suite addon and enable the "Never Ending Reddit" feature.

    2. Find a user with many duplicate submissions

    3. Scroll down to load additional pages and verify that duplicates are coalesced as expected.

Functionality

These tests use specific posts to verify the deduplication functionality.

  1. Deduplicate by thumbnail

    1. Navigate to https://old.reddit.com/by_id/t3_jrjed7,t3_jrqhj4,t3_jo1qwh,t3_jri2y8.

    2. Verify that posts are collated as expected.

      • Post order should be jrjed7, jrqhj4, jri2y8, jo1qwh.
      • jrjed7 should have "(2 duplicates — show)" at end of tagline.
      • jrqhj4 and jri2y8 should be hidden (inline style "display: none").
      • jo1qwh should not be modified.

    3. Verify that show/hide link works as expected.

      • Clicking "show" link should reveal jrqhj4 and jri2y8 and update tagline to "hide".
      • Clicking "hide" link should hide jrqhj4 and jri2y8 and update tagline to "show".

  2. Deduplicate by URL

    1. Navigate to https://old.reddit.com/by_id/t3_jyu5b2,t3_jysgvx,t3_jywerx.

    2. Verify that posts are collated as expected.

      • Post order should be jyu5b2, jywerx, jysgvx.
      • jyu5b2 should have "(1 duplicate — show)" at end of tagline.
      • jywerx should be hidden.

    3. Verify that show/hide link works as expected.

  3. Deduplicate by URL (crosspost)

    1. Navigate to https://old.reddit.com/by_id/t3_jyu5b2,t3_jyvuiz.

    2. Verify that posts are collated as expected.

      • Post order should be jyu5b2, jyvuiz.
      • jyu5b2 should have "(1 duplicate — show)" at end of tagline.
      • jyvuiz should be hidden.

    3. Verify that show/hide link works as expected.

  4. Deduplicate multiple

    1. Navigate to https://old.reddit.com/by_id/t3_jrjed7,t3_jysgvx,t3_jyu5b2,t3_jrqhj4,t3_jo1qwh,t3_jywerx,t3_jri2y8,t3_jyvuiz.

    2. Verify that posts are collated as expected.

      • Post order should be jrjed7, jrqhj4, jri2y8, jysgvx, jyu5b2, jywerx, jyvuiz, jo1qwh.
      • jrjed7 should have "(2 duplicates — show)" at end of tagline.
      • jrqhj4 and jri2y8 should be hidden.
      • jyu5b2 should have "(2 duplicates — show)" at end of tagline.
      • jywerx and jyvuiz should be hidden.

    3. Verify that both show/hide links work as expected.

Settings

These tests verify the settings UI and the different settings values.

  1. Deduplicate by

    1. Navigate to https://old.reddit.com/by_id/t3_jrjed7,t3_jrqhj4

    2. Verify that the two posts are collated.

    3. In the extension settings, select "URL only" deduplication mode.

    4. Refresh the page from step 1.

    5. Verify that the two posts are not collated.

  2. Domain overrides

    1. Navigate to https://old.reddit.com/by_id/t3_narqjh,t3_na423x,t3_nas73l

    2. Verify that all posts are collated

    3. In the extension settings, add a domain override for "independent.co.uk" with "Process thumbnails" deselected.

    4. Refresh the page from step 1.

    5. Verify that posts are collated as expected.

      • narqjh should be collated with nas73l
      • na423x should be separate

  3. Hash function

    1. Navigate to https://old.reddit.com/by_id/t3_k7rhax,t3_k7rdve.

    2. Verify that the two posts are collated.

    3. In the extension settings, select the "Difference Hash" function.

    4. Refresh the page and verify that the two posts are still collated.

    5. In the extension settings, select the "Wavelet Hash" function.

    6. Refresh the page and verify that the two posts are still collated.

  4. Hamming distance

    1. Navigate to https://old.reddit.com/by_id/t3_it6czg,t3_it6el1,t3_it8ric.

    2. Verify that all three posts are collated.

    3. In the extension settings, set the Hamming Distance to 0 (exact match).

    4. Refresh the page from step 1.

    5. Verify that only it6czg and it6el1 are collated.

  5. Partition by domain

    1. Navigate to https://old.reddit.com/by_id/t3_jyymza,t3_jyyy2a.

    2. Verify that the two posts are not collated.

    3. In the extension settings, disable "Partition by domain".

    4. Refresh the page from step 1.

    5. Verify that the posts are collated.

  6. Show hash values

    1. In the extension settings, enable "Show hash values".

    2. On https://old.reddit.com/, verify that posts with a thumbnail have an image hash value in the tagline. The hash string should be 16 hex digits.