upload-codescene-coverage: verify check-mode CLI call count

[coderabbitai]

Summary

Add a CLI call-count contract to the check-mode tests for .github/actions/upload-codescene-coverage.

The current test verifies the stub output for one invocation of:

check --verbose --coverage-files coverage.xml

It does not fail if the action invokes the CLI more than once.

Required change

Use cmd_mox.verify(), or an equivalent strict mock verification, to assert that the expected CodeScene CLI command executes exactly once.

Rationale

A duplicate coverage check can alter runtime, duplicate diagnostics, or cause unexpected side effects. The current stdout assertion cannot detect this regression.

Affected area

• .github/actions/upload-codescene-coverage/tests/test_check_mode.py

Acceptance criteria

• The successful check-mode test asserts exactly one CLI invocation.
• The assertion verifies the expected arguments, including --verbose and --coverage-files coverage.xml.
• A deliberate duplicate invocation causes the test to fail.

References

• Pull request: Skip inapplicable CodeScene coverage checks and surface diagnostics (#395) #399
• Requesting comment: Skip inapplicable CodeScene coverage checks and surface diagnostics (#395) #399 (comment)
• Requested by: @leynos

[coderabbitai]

🔗 Related PRs

leynos/ddlint#287 - Wire the CodeScene coverage gate into CI [merged]
leynos/ghillie#97 - Wire up CodeScene coverage upload and ratchet [merged]
leynos/pylint-pypy-shim#34 - Wire the CodeScene coverage upload into CI [merged]
leynos/episodic#182 - Wire CodeScene coverage upload via the shared actions [merged]
#399 - Skip inapplicable CodeScene coverage checks and surface diagnostics (#395) [open]

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