[Test Improver] tests: skip runtime factory tests when LLM not installed

[danielmeppiel]

🤖 Test Improver - automated AI assistant for test improvements.

Goal and Rationale

Four tests in test_runtime_factory.py hard-coded assumptions that the llm runtime is installed on the host system. In CI (and standard dev environments without the llm Python package), these tests fail unconditionally with:

ValueError: Runtime 'llm' is not available on this system
AssertionError: assert False is True

This creates noise in CI output and obscures real failures.

Approach

Added module-level skip markers that probe runtime availability at collection time using the factory's own runtime_exists() method - so the logic is consistent with production code:

_llm_available = RuntimeFactory.runtime_exists("llm")
skip_no_llm = pytest.mark.skipif(not _llm_available, reason="LLM runtime not installed on this system")

• LLM-specific tests (test_get_runtime_by_name_llm_real, test_create_runtime_with_name_real, test_runtime_exists_llm_true) now skip gracefully when LLM is absent
• test_get_available_runtimes_real_system refactored to be environment-agnostic (any list is valid)
• A new test_get_available_runtimes_includes_llm test captures the LLM-specific assertion, also skippable
• Tests for get_best_available_runtime and create_runtime (auto-detect) skip when no runtime at all is available

Coverage Impact

Before	After
4 failures (LLM not installed)	0 failures, 4 skipped (correctly)

The tests still run and assert correctness when the runtime is present.

Trade-offs

• Slightly more test code, but cleaner CI signal
• Skip reasons are explicit and actionable

Reproducibility

# Run the fixed tests
.venv/bin/pytest tests/unit/test_runtime_factory.py -v

# Full unit suite
.venv/bin/pytest tests/unit/ -q --ignore=tests/unit/test_audit_report.py \
  --ignore=tests/unit/test_deps_update_command.py \
  --ignore=tests/unit/test_plugin_exporter_schema.py

Test Status

• Before: 4 failures in test_runtime_factory.py
• After: 0 failures, 4 skipped (when LLM not installed), 6 passing
• Remaining 7 failures in test_policy_status.py are pre-existing (unrelated to this PR)

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