René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Empty subcollection tests fail on latest Pharo and Squeak versions","articleBody":"Our tests for `#beginsWithSubCollection:` and `#endsWithSubCollection:` with empty arguments fail on the latest Pharo and Squeak versions. It looks like they changed the behavior of `#beginsWith:` and `#endsWith:`\r\n\r\nThe current expectation seems to be based on ANSI `#indexOfSubCollection:startingAt:` which states\r\n\r\n\u003e Answer 0 if no such subsequence is found in the receiver, or if targetSequence is empty.\r\n\r\nAn illustrative example\r\n\r\n```smalltalk\r\n#(1 2 3) beginsWithSubCollection: #(1). \"true\"\r\n#(1 2 3) beginsWithSubCollection: #(). \"false in Pharo 10 and Squeak\r\n5, true in Pharo 11 and Squeak 6 \"\r\n\r\n#(1 2 3) endsWithSubCollection: #(3). \"true\"\r\n#(1 2 3) endsWithSubCollection: #(). \"false in Pharo 10 and Squeak 5,\r\ntrue in Pharo 11 and Squeak 6 \"\r\n```\r\nThere are several possible solutions, the ones with the least chance of blast damage seem to be:\r\n- remove the empty argument tests, we don't seem to have any senders with empty arguments\r\n- introduce `#greaseBeginsWithSubCollection:` and `#greaseEndsWithSubCollection;`\r\n\r\nSee http://lists.squeakfoundation.org/pipermail/seaside-dev/2022-September/007363.html","author":{"url":"https://github.com/marschall","@type":"Person","name":"marschall"},"datePublished":"2022-09-02T16:18:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/147/Grease/issues/147"}