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← Comparing code coverage between passing and failing test runs is a cheap, effective way to localize a bug quickly.
15 connected korrents · 15 moments from 17 Apr 2012 to 25 Sept 2026. Nearly all of them are about software quality .
Everything filed under developer tools
developer tools
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cybersecurity Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Read this korrent: Comparing code coverage between passing and failing test runs is a cheap, effective way to localize a bug quickly. Comparing code coverage between passing and failing test runs is a cheap, effective way to localize a bug quickly. Last stated 2 years ago
25 Apr 2025
RC
Russ Cox — holds since 2025-04-25 — tap for who they are
Same subject: Test coverage is a tool for finding untested code and says nothing about how good the tests are. — tap to centre the map on it Test coverage is a tool for finding untested code and says nothing about how good the tests are. Last stated 15 years ago
17 Apr 2012
MF
Martin Fowler — holds since 2012-04-17 — tap for who they are
Same subject: Covering every line of code in tests does not guarantee covering every possible program state. — tap to centre the map on it Covering every line of code in tests does not guarantee covering every possible program state. Last stated 5 months ago
7 Jun 2026
SS
Salvatore Sanfilippo — holds since 2026-06-07 — tap for who they are
Same subject: Buggy code usually causes outright test failures rather than being silently exercised inside tests that still pass. — tap to centre the map on it Buggy code usually causes outright test failures rather than being silently exercised inside tests that still pass. Last stated 2 years ago
25 Apr 2025
RC
Russ Cox — holds since 2025-04-25 — tap for who they are
Same subject: High code coverage does not guarantee that code is well tested or of high quality. — tap to centre the map on it High code coverage does not guarantee that code is well tested or of high quality. Last stated 7 years ago
4 Feb 2020
MP
Maxence Poutord — holds since 2020-02-04 — tap for who they are
Same subject: Finding vulnerabilities in code has become cheaper, but reproducing, fixing, reviewing and backporting the fixes has not. — tap to centre the map on it Finding vulnerabilities in code has become cheaper, but reproducing, fixing, reviewing and backporting the fixes has not. Last stated a month ago
25 Sept 2026
JK
Jean-Baptiste Kempf — holds since 2026-09-25 — tap for who they are
Same subject: Almost every software project has cheap testing wins left on the table: basic random testing, static analysis and fault injection pay for themselves the first time they are run. — tap to centre the map on it Almost every software project has cheap testing wins left on the table: basic random testing, static analysis and fault injection pay for themselves the first time they are run. Last stated 11 years ago
12 Dec 2015
DL
Dan Luu — holds since 2015-12-12 — tap for who they are
Same subject: A coding AI that integrates only with its own vendor's tools will be very limited compared with one that draws on all the tools you use. — tap to centre the map on it A coding AI that integrates only with its own vendor's tools will be very limited compared with one that draws on all the tools you use. Last stated 3 years ago
16 Mar 2024
QS
Quinn Slack — holds since 2024-03-16 — tap for who they are
Same subject: A compiler that also serves an IDE has to be lazy and deferred throughout — a different way of building compilers from the one the textbooks teach. — tap to centre the map on it A compiler that also serves an IDE has to be lazy and deferred throughout — a different way of building compilers from the one the textbooks teach. Last stated 6 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: A feature-rich native 'view source' option for debugging sites with iPadOS would be beneficial. — tap to centre the map on it A feature-rich native 'view source' option for debugging sites with iPadOS would be beneficial. Last stated a year ago
11 Jul 2025
CO
Christian Oliff — holds since 2025-07-11 — tap for who they are
Same subject: A software engineer who is not using a tool like Cursor is working at half productivity or worse. — tap to centre the map on it A software engineer who is not using a tool like Cursor is working at half productivity or worse. Last stated a year ago
18 Aug 2025
BT
Bret Taylor — holds since 2025-08-18 — tap for who they are
Same subject: AI coding agents work best with the same general-purpose tools built for humans, such as git and file utilities, rather than agent-specific interfaces. — tap to centre the map on it AI coding agents work best with the same general-purpose tools built for humans, such as git and file utilities, rather than agent-specific interfaces. Last stated a year ago
30 Sept 2025
HR
Harper Reed — holds since 2025-09-30 — tap for who they are
Same subject: AI coding assistants remove repetitive work without replacing human judgment. — tap to centre the map on it AI coding assistants remove repetitive work without replacing human judgment. Last stated 9 months ago
17 Feb 2026
EB
Emanuele Bartolesi — holds since 2026-02-17 — tap for who they are
Same subject: AI coding tools perform better on greenfield projects than on existing codebases, though the advantage is smaller than commonly assumed. — tap to centre the map on it AI coding tools perform better on greenfield projects than on existing codebases, though the advantage is smaller than commonly assumed. Last stated 9 months ago
22 Jan 2026
SK
Steve Klabnik — holds since 2026-01-22 — tap for who they are
Same subject: AI coding tools remove the natural filter that slow, effortful building placed on which ideas actually get built. — tap to centre the map on it AI coding tools remove the natural filter that slow, effortful building placed on which ideas actually get built. Last stated 5 months ago
17 Jun 2026
ES
Elio Struyf — holds since 2026-06-17 — tap for who they are
Same subject: AI tools are now highly effective at generating UI code from a rough natural-language description — tap to centre the map on it AI tools are now highly effective at generating UI code from a rough natural-language description Last stated 7 months ago
7 Apr 2026
CW
Chris Wellons — holds since 2026-04-07 — tap for who they are