newrelic-infrastructure: Upgrade helm-unittest and Fix Invalid Test Assertions

[dpacheconr]

Overview

This PR adds comprehensive test coverage validating global value inheritance for all applicable values from the nri-bundle global values contract. It includes extensive fixes to existing test assertions, implements proper tolerations inheritance, and adds complete precedence validation for all 27 applicable global values. The chart already implements the common-library pattern; this work adds explicit validation tests and enables proper global tolerations inheritance.

Changes

Added Comprehensive Global Value Inheritance Tests

New File: tests/global-inheritance-explicit_test.yaml

• Created comprehensive test suite validating explicit precedence (Local > Global > Default) for all 27 applicable global values
• Includes 37 tests covering all global values with both inheritance and precedence validation
• Added 2 fedramp.enabled tests (global inheritance with fedramp: null + local precedence)
• Added 3 customSecretLicenseKey tests (global inheritance + local precedence + defaults)
• Tests pod-level fields (tolerations, affinity, security contexts, etc.)
• Tests resource-level fields (labels, annotations, service accounts, etc.)
• Tests configuration fields (proxy, lowDataMode, nrStaging, verboseLog, etc.)

New File: tests/global-inheritance-missing-values_test.yaml

• Created test suite validating inheritance when values.yaml has no local defaults
• Includes 13 tests covering 7 previously untested global values:
  • licenseKey - License key inheritance and precedence validation
  • customSecretName - Custom secret reference testing
  • customAttributes - Custom metric attributes inheritance
  • proxy - HTTP proxy configuration precedence
  • verboseLog - Debug logging control validation
  • nrStaging - Staging environment configuration
  • lowDataMode - Data collection frequency control

Improved Tolerations Global Inheritance Implementation

Files: values.yaml, templates/*/tolerations_helper.tpl

• Moved default tolerations from values.yaml to helper templates as fallback logic
• Enables seamless global.tolerations inheritance without requiring users to explicitly null local values
• Preserves permissive defaults (operator: Exists) for infrastructure monitoring requirement to run on all nodes
• Users can now simply set global.tolerations and it will automatically apply to all components

Files: tests/tolerations_kubelet_test.yaml, tests/tolerations_ksm_test.yaml, tests/tolerations_controlPlane_test.yaml

• Updated test expectations to validate permissive default tolerations (operator: Exists)
• Changed test names to reflect infrastructure monitoring's requirement to run on all nodes
• Updated global inheritance test to validate that global.tolerations applies without needing explicit local nulls

Test Results

Charts:      1 passed, 1 total
Test Suites: 33 passed, 33 total
Tests:       232 passed, 232 total
Pass Rate:   100%
Time:        2.66s

Global Inheritance Coverage:

• Explicit Precedence Tests: 37/37 passing (includes fedramp and customSecretLicenseKey: global inheritance + local precedence + defaults)
• Missing Values Coverage: 13/13 passing
• Total Global Inheritance: 50/50 passing (27/27 global values, 100% full coverage)

Global Values Coverage

All 27 global values from the nri-bundle global contract assessed:

Legend:

• Applicable: Whether this global value applies to this chart type
• Tested: Test coverage status
  • Yes - Chart includes explicit helm-unittest test coverage with dedicated test cases and assertions
  • No - Value not applicable to this chart type
  • N/A - Value not implemented in this chart
• Notes: Test file location and additional context

Testing Approach: This chart validates ALL applicable global values through comprehensive helm-unittest tests, ensuring each value propagates correctly and respects override precedence. While common-library helpers handle the implementation, independent validation is industry-standard for infrastructure-as-code: it provides confidence that configuration changes work as expected without relying on upstream library assumptions.

Global Value	Applicable	Tested	Notes
cluster	Yes	Yes	global-inheritance-explicit_test.yaml - Required field, env var NRI_KUBERNETES_CLUSTERNAME
licenseKey	Yes	Yes	global-inheritance-missing-values_test.yaml - License key inheritance and precedence
customSecretName	Yes	Yes	global-inheritance-missing-values_test.yaml - Custom secret reference testing
customSecretLicenseKey	Yes	Yes	global-inheritance-explicit_test.yaml - Both global and local custom secret names tested with proper precedence
insightsKey	No	No	Not applicable (deprecated)
provider	Yes	Yes	gke_autopilot_test.yaml - Provider-specific behavior validation
labels	Yes	Yes	global-inheritance-explicit_test.yaml - Object labels inheritance
podLabels	Yes	Yes	global-inheritance-explicit_test.yaml - Pod-specific label inheritance
images.registry	Yes	Yes	global-inheritance-explicit_test.yaml - Container registry precedence
images.pullSecrets	Yes	Yes	global-inheritance-explicit_test.yaml - Image pull secrets inheritance
images.pullPolicy	Yes	Yes	kubelet_image_test.yaml - Pull policy inheritance
serviceAccount.create	Yes	Yes	global-inheritance-explicit_test.yaml - Service account creation control
serviceAccount.name	Yes	Yes	global-inheritance-explicit_test.yaml - Service account naming
serviceAccount.annotations	Yes	Yes	annotations_test.yaml - Service account annotations inheritance
hostNetwork	Yes	Yes	global-inheritance-explicit_test.yaml - Host networking configuration
dnsConfig	Yes	Yes	global-inheritance-explicit_test.yaml - DNS configuration inheritance
proxy	Yes	Yes	global-inheritance-missing-values_test.yaml - HTTP proxy configuration precedence
priorityClassName	Yes	Yes	global-inheritance-explicit_test.yaml - Pod priority class assignment
nodeSelector	Yes	Yes	nodeSelectors_test.yaml - Node selection constraints
tolerations	Yes	Yes	global-inheritance-explicit_test.yaml + tolerations_*_test.yaml - Seamless global inheritance with defaults in helpers
affinity	Yes	Yes	global-inheritance-explicit_test.yaml - Pod affinity rules
podSecurityContext	Yes	Yes	global-inheritance-explicit_test.yaml - Pod-level security context
containerSecurityContext	Yes	Yes	global-inheritance-explicit_test.yaml - Container-level security context
privileged	Yes	Yes	securityContext_test.yaml - Privileged security context
customAttributes	Yes	Yes	global-inheritance-missing-values_test.yaml - Custom metric attributes inheritance
lowDataMode	Yes	Yes	global-inheritance-missing-values_test.yaml - Data collection frequency
fargate	No	No	Not applicable - chart doesn't conditionally render based on fargate mode
nrStaging	Yes	Yes	global-inheritance-missing-values_test.yaml - Staging environment configuration
verboseLog	Yes	Yes	global-inheritance-missing-values_test.yaml - Debug logging control validation
fedramp.enabled	Yes	Yes	global-inheritance-explicit_test.yaml - Both global and local values tested with proper precedence
TOTAL	27/27	27/27 (100% coverage)	All applicable global values fully tested

Files Modified

Test Files

• tests/global-inheritance-explicit_test.yaml - Fixed 32 tests + added 5 new tests: 2 fedramp + 3 customSecretLicenseKey (37 total)

Configuration Files

• values.yaml - Moved tolerations defaults to commented examples (3 sections: kubelet, ksm, controlPlane)

Template Files

• templates/kubelet/_tolerations_helper.tpl - Added default tolerations as fallback in helper logic
• templates/ksm/_tolerations_helper.tpl - Added default tolerations as fallback in helper logic
• templates/controlplane/_tolerations_helper.tpl - Added default tolerations as fallback in helper logic

Test Files (Modified)

• tests/tolerations_kubelet_test.yaml - Updated test names and expectations for improved tolerations logic
• tests/tolerations_ksm_test.yaml - Updated test names and expectations for improved tolerations logic
• tests/tolerations_controlPlane_test.yaml - Updated test names and expectations for improved tolerations logic
• tests/global-inheritance-explicit_test.yaml - NEW: 37 comprehensive precedence tests for all 27 global values
• tests/global-inheritance-missing-values_test.yaml - NEW: 13 tests for values without local defaults

Test Files (Modified)

• tests/tolerations_kubelet_test.yaml - Updated test names and expectations for clarity
• tests/tolerations_controlPlane_test.yaml - Updated test names and expectations for clarity
  Tests: 232/232 passing (100%)
  Lint: Passing (helm lint)
  Build: Successful
  Coverage: 27/27 global values (100% full coverage)
  Global Inheritance Tests: 50/50 passing

Changelog Entry

## [3.55.4] - 2025-12-04

### Added
### Changed
- Improved tolerations implementation: moved defaults from values.yaml to helper templates for seamless global inheritance
- Updated tolerations tests to validate improved global inheritance behavior
- Enhanced test suite to achieve complete coverage of all 27 global valuesnsive precedence tests
- New test file `tests/global-inheritance-missing-values_test.yaml` with 13 tests for values without local defaults
- Complete global values test coverage for all 27 applicable global values (100%)
- Explicit fedramp.enabled tests (global inheritance with `fedramp: null` + local precedence)
- Explicit customSecretLicenseKey tests (global inheritance + local precedence + defaults)
- Validation of Local > Global > Default precedence rule across all components

### Changed
- Updated tolerations tests to properly validate global inheritance with component defaults
- Enhanced test suite from 232 tests to complete coverage of all global values