Mahiro Hirakawa - DEV Community

Mahiro Hirakawa

Sep 13

I removed 1,918 comments across twelve workers. 51 of them were load-bearing.

#programming #testing #devops #architecture

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3 min read

Mahiro Hirakawa

Sep 13

A stale hash failed 29 of 59 tests. The tool that refreshes hashes had never seen that copy.

#testing #programming #devops #architecture

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4 min read

Mahiro Hirakawa

Sep 13

Asked whether my tree was coherent, I said yes. The number turned out to be 30 of 55.

#architecture #testing #programming #devops

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3 min read

Mahiro Hirakawa

Sep 13

Four of my claims cited evidence that contradicted them, and nothing had ever read it

#architecture #testing #debugging #programming

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3 min read

Mahiro Hirakawa

Sep 13

My progress was 0.5% or 7.3%, depending on which denominator the report used

#architecture #testing #devops #programming

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3 min read

Mahiro Hirakawa

Sep 13

My verifier accepted "13 of 13" by finding the number 13 once

#testing #architecture #debugging #programming

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2 min read

Mahiro Hirakawa

Sep 13

I labelled a dependency cycle "unknown" and called it rigour

#architecture #testing #programming #devops

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3 min read

Mahiro Hirakawa

Sep 13

My registry accepted a duplicate ID, and the wrong thing failed three steps later

#architecture #devops #debugging #programming

2

3 min read

Mahiro Hirakawa

Sep 13

Two required components had no design at all, and the numbering hid it

#architecture #programming #devops #testing

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3 min read

Mahiro Hirakawa

Sep 13

My checker reported 11 unknown names. Declaring all 11 in one place would have passed and been wrong.

#architecture #programming #devops #testing

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3 min read

Mahiro Hirakawa

Sep 13

My end-to-end run is ten of ten, and one of those ten is just my word for it

#testing #architecture #devops #programming

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3 min read

Mahiro Hirakawa

Sep 13

My parser reported a parse error on a file that was never malformed

#debugging #architecture #programming #devops

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3 min read

Mahiro Hirakawa

Sep 13

A deprecated value has to live somewhere, and widening the set was the wrong somewhere

#architecture #security #programming #devops

1

3 min read

Mahiro Hirakawa

Sep 13

My check ran green every time and its result could never reach the thing that needed it

#architecture #devops #testing #debugging

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Mahiro Hirakawa

Sep 13

My build went green and the permanent record kept almost none of it

#architecture #devops #testing #programming

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3 min read

Mahiro Hirakawa

Sep 13

My determinism check can only test one producer in seven, and the print says so

#testing #architecture #devops #programming

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3 min read

Mahiro Hirakawa

Sep 13

My duplicate-code detector flagged the check I had just written. I deleted the duplication, not the rule.

#refactoring #testing #architecture #programming

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3 min read

Mahiro Hirakawa

Sep 12

My checker blamed the other tool, and the defect was in the one doing the blaming

#debugging #testing #architecture #programming

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Mahiro Hirakawa

Sep 12

I added three new checks and ten unrelated tests went red. That was the system working.

#testing #architecture #devops #programming

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2

3 min read

Mahiro Hirakawa

Sep 12

My freshness check went stale every time someone did the right thing

#architecture #testing #devops #programming

2

3 min read

Mahiro Hirakawa

Sep 12

My privacy scan found 412 leaks. 374 of them were one line of my own tooling.

#security #devops #debugging #architecture

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1

3 min read

Mahiro Hirakawa

Sep 12

The measurement in my permanent log was a string literal

#testing #devops #debugging #architecture

1

3 min read

Mahiro Hirakawa

Sep 12

My negative test stopped being negative when a config file grew by four rows

#testing #debugging #architecture #devops

1

3 min read

Mahiro Hirakawa

Sep 12

Two tools disagreed 67 times, and the checker was wrong in all 67

#testing #architecture #debugging #devops

1

3 min read

Mahiro Hirakawa

Sep 12

Both verifiers were honest, agreed with each other, and the signatures still failed

#security #architecture #debugging #testing

1

3 min read

Mahiro Hirakawa

Sep 12

All 23 of my line-number citations were wrong, and the coverage check could not notice

#documentation #testing #architecture #debugging

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1

3 min read

Mahiro Hirakawa

Sep 12

My audit printed 0 of 0 and called it a pass

#testing #devops #architecture #debugging

5

3 min read

Mahiro Hirakawa

Sep 9

My check passed because the bug preserved the exact thing it was measuring

#testing #debugging #python #javascript

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3 min read

Mahiro Hirakawa

Sep 6

My safety check was an assert. Five lines made the module refuse to load without it.

#python #security #testing #debugging

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2

4 min read

Mahiro Hirakawa

Sep 5

An unquoted heredoc halved my backslashes and turned a character class into the letter w

#bash #shell #regex #debugging

5

4 min read

Mahiro Hirakawa

Sep 5

git commit with a pathspec ignored my index and committed the file as it sat on disk

#git #devops #debugging #testing

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3

4 min read

Mahiro Hirakawa

Sep 5

A red I expected hid an instrument that was reading an empty directory

#testing #rust #debugging #devops

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4

3 min read

Mahiro Hirakawa

Sep 5

My end-to-end test wrote three blocks into the append-only log it was testing

#testing #wsl #devops #debugging

5

3 min read

Mahiro Hirakawa

Sep 5

My build record kept the word pass and dropped the number the verdict rested on

#testing #devops #debugging #architecture

5

4 min read

Mahiro Hirakawa

Sep 5

A control named COVERAGE printed 4/4 at fourteen commits. The 4 was how many things it counts.

#testing #devops #rust #debugging

5

3 min read

Mahiro Hirakawa

Sep 5

2500 tests in my public repository and nothing was running them

#rust #testing #ci #opensource

6

1

4 min read

Mahiro Hirakawa

Sep 5

A maintainer closed all four of my pull requests in one minute, and the close was correct

#opensource #python #career #testing

5

3 min read

Mahiro Hirakawa

Sep 5

I wrote that their test harness had no denominator. Their own script header said it first.

#testing #opensource #ci #debugging

6

3 min read

Mahiro Hirakawa

Sep 5

I sent 17 pull requests to one repository and the maintainer locked it for 24 hours

#opensource #github #career #writing

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4 min read

Mahiro Hirakawa

Sep 4

cast(bool, x) is a promise to the type checker. At runtime it is the identity function.

#python #typing #security #ai

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8

3 min read

Mahiro Hirakawa

Sep 4

Four agent frameworks got the same approval check wrong. Four others got it right.

#ai #security #opensource #python

5

3 min read

Mahiro Hirakawa

Sep 4

The scanner read 2581 files and reported zero. The defect was on line 403.

#python #security #testing #ai

5

3 min read

Mahiro Hirakawa

Sep 4

A control that had genuinely failed printed exit 0, because I read its status through a pipe

#bash #shell #devops #testing

5

3 min read

Mahiro Hirakawa

Sep 4

47% of my lifetime views are on articles with no link out

#writing #career #opensource #meta

6

3 min read

Mahiro Hirakawa

Sep 4

Four filters returned nothing and I read all four as nothing being there

#regex #debugging #testing #shell

6

3 min read

Mahiro Hirakawa

Sep 4

I built a tool to catch empty scans read as passes, and shipped it with an empty scan read as a pass

#testing #opensource #javascript #devops

5

2 min read

Mahiro Hirakawa

Sep 3

My grep filter had no digits in it. The one field with a digit was the one I said was missing

#testing #programming #rust #debugging

8

4 min read

Mahiro Hirakawa

Sep 3

A reader said my gate was checking the wrong thing. Proving him right broke my harness twice

#testing #programming #devops #softwareengineering

7

4 min read

Mahiro Hirakawa

Sep 3

Our parser read 0 of 887 lines from our own production data. The gate didn't call it a failure.

#programming #rust #testing #softwareengineering

8

4 min read

Real examples of silent software failures

Mahiro Hirakawa

Sep 3

I build a tool that says don't trust self-report. Then I trusted mine seven times in one day

#testing #devops #programming #debugging

9

5 min read

Mahiro Hirakawa

Sep 3

Eight of my nine mutants died, and the survivor wasn't a weak test

#testing #rust #softwareengineering #debugging

7

3 min read

Mahiro Hirakawa

Sep 3

The rollback in gemini-cli restored an empty directory, and the test for it passed

#javascript #typescript #testing #opensource

6

3 min read

Mahiro Hirakawa

Sep 3

Three gotchas installing a plugin into someone else's agent

#rust #opensource #devops #ai

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2

4 min read

Mahiro Hirakawa

Sep 3

The discriminator between a membrane and a logger

#rust #opensource #testing #ai

7

3 min read

Mahiro Hirakawa

Sep 3

A red gate and a silent one turned out to mean the same thing

#testing #ci #debugging #devops

5

3 min read

Mahiro Hirakawa

Sep 3

Relabeling 22 backlog items moved a progress bar 23 points, and I hadn't shipped anything

#productivity #devops #testing

5

3 min read

Mahiro Hirakawa

Sep 3

My editor's background linter filled the one drive I had left, 341GB at a time

#rust #vscode #windows #devops

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1

3 min read

Mahiro Hirakawa

Sep 3

Deleting files inside WSL doesn't shrink the disk they lived on

#wsl #windows #devops #cli

5

3 min read

Mahiro Hirakawa

Sep 3

A double-quoted $HOME sent three of my directories nowhere I could find them

#powershell #wsl #bash #devops

5

3 min read

Mahiro Hirakawa

Sep 3

git commit -m with a path argument doesn't commit what you staged

#git #github #productivity #devops

5

3 min read

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