Added count function

[olavsorl]

Description

Added count expression function

Related Issue(s)

• closes Add list count expression #1830

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)
• All tests run green

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

Summary by CodeRabbit

• New Features

  • Added an expression function to count the number of elements in a list (JSON arrays), including support for empty lists and lists containing nulls.
  • Handles nested lists as single elements (no flattening).

• Bug Fixes

  • Improved validation: provides clear errors when count is called with an invalid argument count or when the argument is not a list.

• Tests

  • Added shared test cases and coverage for both valid and failing count scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7c648aab-7e50-4eff-b705-cef18708b373

📥 Commits

Reviewing files that changed from the base of the PR and between 4d1ad75 and 9f9b8e0.

📒 Files selected for processing (1)

• test/Altinn.App.Core.Tests/PublicApiTests.PublicApi_ShouldNotChange_Unintentionally.verified.txt

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📝 Walkthrough

Walkthrough

Adds count to the expression function enum, routes evaluation to a new count helper, records the API snapshot change, and adds shared tests for valid list counts plus invalid arity and type cases.

Changes

List count expression

Layer / File(s)	Summary
Expression function and evaluator dispatch src/Altinn.App.Core/Models/Expressions/ExpressionFunction.cs, src/Altinn.App.Core/Internal/Expressions/ExpressionEvaluator.cs, test/Altinn.App.Core.Tests/PublicApiTests.PublicApi_ShouldNotChange_Unintentionally.verified.txt	ExpressionFunction gains count, EvaluateExpression_internal dispatches to a new helper that accepts one JSON array and returns its element count, and the public API snapshot records the new enum member.
Shared count test coverage test/Altinn.App.Core.Tests/LayoutExpressions/CommonTests/TestFunctions.cs, test/Altinn.App.Core.Tests/LayoutExpressions/CommonTests/shared-tests/functions/count/count.json	Adds the count shared-test entry point and cases for successful list counts plus invalid arity and non-list inputs.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a count function.
Linked Issues check	✅ Passed	The changes implement the requested list count expression and return the number of elements in a list.
Out of Scope Changes check	✅ Passed	The added tests and public API snapshot update are directly related to the new count function and not out of scope.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/1830-add-list-count-expression

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[TomasEng]

Det ser ut til at det er en test som feiler her.

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud