test(common): Add unit tests for cli-colors utility

[Se3do]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe: Add unit test coverage for cli-colors utility

What is the current behavior?

cli-colors.util.ts has no unit tests. This utility provides ANSI color
wrapping for NestJS CLI output (logger, REPL, injector) and respects the
NO_COLOR environment variable standard — yet its color wrapping and
env-var logic are untested.

Issue Number: N/A

What is the new behavior?

Adds packages/common/test/utils/cli-colors.util.spec.ts covering:

• isColorAllowed() returns true by default
• isColorAllowed() returns false when NO_COLOR is set
• clc.green() wraps text in ANSI green codes
• clc.bold() wraps text in ANSI bold codes (different close sequence)
• All clc.* methods return raw text when NO_COLOR is set
• Standalone yellow() uses extended ANSI codes

Uses afterEach cleanup to prevent cross-test env var contamination.

Does this PR introduce a breaking change?

• Yes
• No

Other information

This change only adds test coverage and does not modify runtime behavior.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds unit tests for the CLI color utility to verify ANSI wrapping behavior and NO_COLOR opt-out semantics.

Changes:

• Introduces tests for isColorAllowed() default and NO_COLOR-disabled behavior
• Adds assertions for clc style wrappers (e.g., green/bold) and NO_COLOR passthrough
• Adds a dedicated test for the yellow() extended ANSI formatter

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[coveralls]

Coverage Report for CI Build 13423

Coverage increased (+0.01%) to 90.039%

Details

• Coverage increased (+0.01%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	8624
Covered Lines:	7765
Line Coverage:	90.04%
Relevant Branches:	2943
Covered Branches:	2387
Branch Coverage:	81.11%
Branches in Coverage %:	No
Coverage Strength:	56.72 hits per line

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💛 - Coveralls