Function coverage below 100% even though there are no uncovered lines

[ralfhandl]

After adding tests until there are no uncovered lines, the "function" coverage is still below 100% for one schema:

 % Coverage report from @hyperjump/json-schema-coverage/vitest
------------------|---------|----------|---------|---------|-------------------
File              | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
------------------|---------|----------|---------|---------|-------------------
All files         |     100 |      100 |   99.76 |     100 |                  
 dialect.yaml     |     100 |      100 |     100 |     100 |                  
 meta.yaml        |     100 |      100 |     100 |     100 |                  
 schema-base.yaml |     100 |      100 |     100 |     100 |                  
 schema.yaml      |     100 |      100 |   99.74 |     100 |                  
------------------|---------|----------|---------|---------|-------------------
ERROR: Coverage for functions (99.76%) does not meet global threshold (100%)

According to the Legend

• Functions = Subschemas

and I don't understand how I can miss a subschema if I have covered all lines.

How can I find out what I need to test (or refactor in the schema) to get to 100% coverage?

See OpenAPI PR OAI/OpenAPI-Specification#4780 for details.

[jdesrosiers]

Not sure why the text report doesn't give the line, but it shows up in the HTML report (run npx http-server coverage after running the tests). The istanbul coverage format is designed for JavaScript and there isn't quite a 1:1 translation to schemas. I'm guessing something's getting lost in translation. I'll have a look and see if there's anything that can be done.

[jdesrosiers]

After looking into this, it looks like this is just the way the report works. I ran some tests with JavaScript code and found a similar result. Apparently, the report doesn't include line numbers for uncovered functions.

 % Coverage report from v8
---------------|---------|----------|---------|---------|-------------------
File           | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
---------------|---------|----------|---------|---------|-------------------
All files      |     100 |      100 |      50 |     100 |                   
 scratch       |     100 |      100 |      50 |     100 |                   
  some-code.js |     100 |      100 |      50 |     100 |                   
---------------|---------|----------|---------|---------|-------------------