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[Storage] Add STD docstrings to CCLM tests#5480

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rnetser merged 3 commits into
RedHatQE:mainfrom
jpeimer:cclm_std
Jul 9, 2026
Merged

[Storage] Add STD docstrings to CCLM tests#5480
rnetser merged 3 commits into
RedHatQE:mainfrom
jpeimer:cclm_std

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@jpeimer

@jpeimer jpeimer commented Jul 2, 2026

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What this PR does / why we need it:
  • Add STD docstrings to CCLM tests
  • Fix pre-merge check: rename Jira epic:Jira:
Which issue(s) this PR fixes:
Special notes for reviewer:

Assisted-by: Claude noreply@anthropic.com

jira-ticket:

Summary by CodeRabbit

  • Documentation
    • Expanded migration test documentation with structured multi-line descriptions, including preconditions, steps, and expected results.
    • Added clearer coverage notes for multiple VM cross-cluster live migration scenarios, a Windows VM with vTPM, and migrations across different storage classes.

Assisted-by: Claude <noreply@anthropic.com>
Signed-off-by: Jenia Peimer <jpeimer@redhat.com>
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Review Change Stack

📝 Walkthrough

Walkthrough

This PR adds multi-line docstrings to tests/storage/cross_cluster_live_migration/test_cclm.py across three cross-cluster live migration scenarios. It also changes one header Jira label from Jira epic: to Jira:. No test logic, assertions, or fixtures change.

Changes

Test Documentation for Cross-Cluster Live Migration

Layer / File(s) Summary
Several VMs migration scenario docstrings
tests/storage/cross_cluster_live_migration/test_cclm.py
Docstrings added to TestCCLMSeveralVMs class and methods covering migration wait, file persistence, VM stop, intra-target compute live migration, and deletion verification, plus the Jira header wording update.
Windows VM with vTPM scenario docstrings
tests/storage/cross_cluster_live_migration/test_cclm.py
Docstrings added to Windows VM migration test methods covering migration wait, stopped-state check, intra-target live migration, and deletion.
StorageA to StorageB migration scenario docstrings
tests/storage/cross_cluster_live_migration/test_cclm.py
Docstrings added to TestCCLMFromStorageAtoB class and methods covering migration, boot-id comparison, file persistence, source VM stopped check, intra-target live migration, and deletion.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

Suggested reviewers: josemacassan, kshvaika, acinko-rh, kgoldbla, ema-aka-young


Caution

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

  • Ignore

❌ Failed checks (1 error)

Check name Status Explanation Resolution
Description check ❌ Error The template is only partially filled: the issue section is blank and jira-ticket is not completed or set to NONE. Fill in the issue section and set jira-ticket to the full Jira URL or NONE, removing the placeholder comment.
✅ Passed checks (4 passed)
Check name Status Explanation
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Stp Link Required ✅ Passed PR adds no new test files or def test_* functions; test_cclm.py is identical in both merge parents, so the STP/RFE/Jira-link rule doesn’t apply.
Title check ✅ Passed The title is concise, under 120 characters, and clearly states the change: adding STD docstrings to CCLM tests.
✨ Finishing Touches
🧪 Generate unit tests (beta)
  • Create PR with unit tests

Warning

Review ran into problems

🔥 Problems

Linked repositories: Your configuration references 1 linked repositories, but your current plan allows 0. Analyzed ``, skipped RedHatQE/openshift-virtualization-tests-design-docs.


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@jpeimer

jpeimer commented Jul 5, 2026

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/verified

Only added the docstrings, no need to run any tests

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Test execution plan request details

CRITICAL: You MUST post an inline review comment on the first changed line of the first file.
The inline comment should contain the full Test Execution Plan (smoke decision, gating decision, and specific affected tests).
Do NOT submit a blocking review event (REQUEST_CHANGES/APPROVE).
Post a single inline PR comment on Files Changed (non-blocking COMMENT flow).

As an expert software testing engineer, analyze all modified files in this PR and create a targeted test execution plan.
You will post an inline review comment with the test execution plan on the first changed file.
If you fail to run or post a comment, retry.

Analysis Requirements:

  1. Examine code changes in each modified file

  2. Identify affected code paths, functions, and classes

  3. Analyze pytest-specific elements: fixtures (scope, dependencies), parametrization, markers, conftest changes

  4. Trace test dependencies through imports, shared utilities, fixture inheritance, fixture teardown, and yield from cleanup in conftest

  5. Detect new tests introduced in the PR

  6. Utilities and libs impact (when utilities/ or libs/ changes):
    You MUST use shell scripts (rg, git diff) to trace the full impact.
    Follow these sub-steps in order:

    6a. Identify modified symbols: For each changed file under utilities/ or libs/,
    list every modified function or method.
    Example: git diff HEAD~1 --unified=0 -- utilities/hco.py | grep '^[+-]def '

    6b. Find direct callers: Search tests and conftest for each symbol from 6a.
    Example: rg -l 'get_hco_version' tests/

    6c. Trace fixture teardown and cleanup: Find fixtures that reach
    the modified symbol through yield from or context-manager wrappers.
    Example: rg -l 'yield from.*enable_common_boot|def.*enable_common_boot' tests/

    6d. Trace same-file callers: In each changed file, find other functions
    whose body calls a modified symbol (including code after yield
    in @contextmanager helpers).
    Example: rg 'get_hco_version|enable_common_boot' utilities/hco.py

    6e. Expand transitively: If function A calls modified B, then
    tests/fixtures that call A are affected — even when the test body
    never imports B directly.

    Do NOT limit impact to tests that import the modified symbol only.

  7. Smoke test impact: Intersect the affected set from step 6 with smoke-marked tests.
    Run: rg -l '@pytest.mark.smoke' tests/
    VERIFY the above command returned actual file paths before concluding False.
    Set True if either condition is met:

    • a smoke-marked file appears in the affected set from 6b-6e, OR
    • any conftest.py in the smoke test's parent-directory hierarchy (up to repo root)
      imports or calls a modified utilities/libs symbol — including autouse fixtures
      that depend on modified functions. ALL tests in that directory and below are affected.
      Example check: for each smoke_file, scan dirname(smoke_file)/conftest.py,
      dirname(dirname(smoke_file))/conftest.py, etc. for modified symbol imports
      and autouse fixtures that depend on modified symbols.
  8. Gating test impact: Intersect the affected set from step 6 with gating-marked tests.
    Run: rg -l '@pytest.mark.gating' tests/
    Set True if a gating-marked file also appears in the affected set from 6b-6e.
    Utilities/libs changes often affect gating tests without affecting smoke tests.
    Do NOT stop analysis after concluding Run smoke tests: False.

Output rules:
Do NOT include analysis step numbers (1-8) in your visible output.

Your deliverable:
Your inline informational comment will be based on the following requirements:

Test Execution Plan

  • Run smoke tests: True / False — If True, state the dependency path (test → fixture → changed symbol). True ONLY with a verified path.
  • Run gating tests: True / False — If True, state the dependency path. True if any gating-marked test is in the affected set.
  • Affected tests to run (required when utilities/, libs/, or shared conftest changes — list concrete paths even when smoke is False)

Use these formats:

  • path/to/test_file.py - When the entire test file needs verification
  • path/to/test_file.py::TestClass::test_method - When specific test(s) needed
  • path/to/test_file.py::test_function - When specific test(s) needed
  • -m marker - When a marker covers multiple affected tests (e.g. -m gating only if ALL gating tests in scope need run)
  • Tag each listed test or group with its marker when not obvious, e.g. (gating) or (smoke)

Real test commands (MANDATORY when changes affect session/runtime code):

When the affected code runs at session/collection time (conftest fixtures, pytest plugins,
config hooks, session-scoped setup) or modifies runtime behavior that unit tests mock away,
you MUST include concrete pytest commands the PR author must run on a real cluster
to verify the change works end-to-end. Include:

  • A command for the error/fix path (the scenario the PR fixes)
  • A command for the happy path (regression: the normal case still works)
  • Use lightweight tests (e.g., --collect-only for startup failures,
    a single small test for runtime behavior)
    If the PR only changes test logic (not utilities/libs/conftest), the affected test
    paths themselves serve as the real test commands — no separate section needed.

Example output for a session-startup fix:

**Real tests (cluster required)**
Error path (the fix):
`pytest tests/storage/.../test_foo.py --storage-class-matrix=nonexistent-sc --collect-only`
Expected: ValueError with clear message, not IndexError

Happy path (regression):
`pytest tests/storage/.../test_foo.py --storage-class-matrix=<valid-sc> -k test_bar`
Expected: session starts normally

Guidelines:

  • Include tests affected directly OR via fixture setup/teardown, yield from cleanup, or transitive utility call chains (caller calls modified helper)
  • Use a full file path only if ALL tests in that file require verification
  • Use file path + test name when only specific tests use an affected fixture or utility wrapper (preferred for partial file impact)
  • If a test marker can cover multiple files/tests, provide the marker
  • Balance coverage vs over-testing - Keep descriptions minimal
  • Example: if leaf helper foo() changes, include tests whose fixture teardown calls wrapper bar() where bar() calls foo(), even when the test body only imports an unrelated symbol from the same utilities module

Hardware-Related Checks (SR-IOV, GPU, DPDK):

When PR modifies fixtures for hardware-specific resources:

  • Collection Safety: Fixtures MUST have existence checks (return None when hardware unavailable)
  • Test Plan: MUST verify both WITH and WITHOUT hardware:
    • Run affected tests on cluster WITH hardware
    • Verify collection succeeds on cluster WITHOUT hardware

CRITICAL WORKFLOW COMPLETION RULES:

When responding to this test execution plan request, you MUST follow these rules EXACTLY:

  1. YOUR ONLY DELIVERABLE: Post one non-blocking inline comment containing the test execution plan on the first changed line
  2. THEN STOP IMMEDIATELY - Do NOT generate any additional response
  3. FALLBACK ONLY: If inline comment API calls fail after retrying, post as a regular PR comment
  4. SILENCE = SUCCESS: After successfully submitting the review, your task is complete. No confirmation needed.

ABSOLUTE PROHIBITIONS (violating these creates empty/meaningless reviews):

  • ❌ Do NOT post acknowledgment messages like "Test execution plan posted", "Review posted successfully", "I've successfully posted"
  • ❌ Do NOT mention review IDs, URLs, or confirmation of posting in the PR thread
  • ❌ Do NOT add any follow-up comments after submitting the review
  • ❌ Do NOT reply to confirm task completion
  • ❌ Do NOT explain what you did - just do it and stop

Remember: The pull request review is visible to users. Additional comments are redundant noise.

CRITICAL — Verification rules for smoke and gating decisions:
- For each True decision, you must have traced a concrete path: test file → fixture → utility function → modified symbol.
- Do NOT assume impact based on scope, file proximity, or infrastructure-sounding names.
Only set True when you trace a concrete path through steps 6a-6e, then 7 or 8.
WRONG: "utilities/hco.py changed → run smoke" (no traced dependency path)
WRONG: "Run smoke tests: False" with no affected-test list when gating tests use the changed utility
RIGHT: "Run smoke tests: False, Run gating tests: True" plus tests/.../test_foo.py::TestBar::test_baz (gating)
RIGHT: "Smoke test X uses fixture Y → wrapper Z → changed function W in utilities/hco.py"

Comment thread tests/storage/cross_cluster_live_migration/test_cclm.py
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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
gh pr diff 5480 --repo RedHatQE/openshift-virtualization-tests | head -40

Length of output: 2145


🏁 Script executed:

#!/bin/bash
set -euo pipefail
REPO="RedHatQE/openshift-virtualization-tests"
PR=5480

HEAD_SHA=$(gh pr view $PR --repo "$REPO" --json headRefOid --jq '.headRefOid')
echo "HEAD_SHA=$HEAD_SHA"

BODY='**Test Execution Plan**

- **Run smoke tests: False** — No production/utilities/libs code paths were modified; only docstrings were added to test methods and classes.
- **Run gating tests: False** — No test logic, fixtures, parametrization, or markers were changed; only documentation (docstrings) was added.
- **Affected tests to run**: None required beyond a documentation review. No functional test behavior changed.

Rationale: This PR only inserts docstrings (Preconditions/Steps/Expected sections) into `tests/storage/cross_cluster_live_migration/test_cclm.py`. Test signatures, fixture dependencies, `@pytest.mark.dependency`/`@pytest.mark.polarion` decorators, and helper calls (migration condition wait, boot-id checks, file persistence checks, VM stop/delete assertions, compute live migration verification) remain unchanged. No `utilities/` or `libs/` files were touched, so there is no traceable dependency path to smoke- or gating-marked tests.'

gh api \
  --method POST \
  -H "Accept: application/vnd.github+json" \
  "/repos/${REPO}/pulls/${PR}/comments" \
  -f body="$BODY" \
  -f commit_id="$HEAD_SHA" \
  -f path="tests/storage/cross_cluster_live_migration/test_cclm.py" \
  -F line=62 \
  -f side="RIGHT"

Length of output: 5265


The inline test execution plan has been posted successfully on line 62 of tests/storage/cross_cluster_live_migration/test_cclm.py.

jpeimer added 2 commits July 6, 2026 14:25
Assisted-by: Claude <noreply@anthropic.com>
Signed-off-by: Jenia Peimer <jpeimer@redhat.com>
@jpeimer

jpeimer commented Jul 6, 2026

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/verified

Only added the docstrings, no need to run any tests

@openshift-virtualization-qe-bot-3

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@coderabbitai

Test execution plan request details

CRITICAL: You MUST post an inline review comment on the first changed line of the first file.
The inline comment should contain the full Test Execution Plan (smoke decision, gating decision, and specific affected tests).
Do NOT submit a blocking review event (REQUEST_CHANGES/APPROVE).
Post a single inline PR comment on Files Changed (non-blocking COMMENT flow).

As an expert software testing engineer, analyze all modified files in this PR and create a targeted test execution plan.
You will post an inline review comment with the test execution plan on the first changed file.
If you fail to run or post a comment, retry.

Analysis Requirements:

  1. Examine code changes in each modified file

  2. Identify affected code paths, functions, and classes

  3. Analyze pytest-specific elements: fixtures (scope, dependencies), parametrization, markers, conftest changes

  4. Trace test dependencies through imports, shared utilities, fixture inheritance, fixture teardown, and yield from cleanup in conftest

  5. Detect new tests introduced in the PR

  6. Utilities and libs impact (when utilities/ or libs/ changes):
    You MUST use shell scripts (rg, git diff) to trace the full impact.
    Follow these sub-steps in order:

    6a. Identify modified symbols: For each changed file under utilities/ or libs/,
    list every modified function or method.
    Example: git diff HEAD~1 --unified=0 -- utilities/hco.py | grep '^[+-]def '

    6b. Find direct callers: Search tests and conftest for each symbol from 6a.
    Example: rg -l 'get_hco_version' tests/

    6c. Trace fixture teardown and cleanup: Find fixtures that reach
    the modified symbol through yield from or context-manager wrappers.
    Example: rg -l 'yield from.*enable_common_boot|def.*enable_common_boot' tests/

    6d. Trace same-file callers: In each changed file, find other functions
    whose body calls a modified symbol (including code after yield
    in @contextmanager helpers).
    Example: rg 'get_hco_version|enable_common_boot' utilities/hco.py

    6e. Expand transitively: If function A calls modified B, then
    tests/fixtures that call A are affected — even when the test body
    never imports B directly.

    Do NOT limit impact to tests that import the modified symbol only.

  7. Smoke test impact: Intersect the affected set from step 6 with smoke-marked tests.
    Run: rg -l '@pytest.mark.smoke' tests/
    VERIFY the above command returned actual file paths before concluding False.
    Set True if either condition is met:

    • a smoke-marked file appears in the affected set from 6b-6e, OR
    • any conftest.py in the smoke test's parent-directory hierarchy (up to repo root)
      imports or calls a modified utilities/libs symbol — including autouse fixtures
      that depend on modified functions. ALL tests in that directory and below are affected.
      Example check: for each smoke_file, scan dirname(smoke_file)/conftest.py,
      dirname(dirname(smoke_file))/conftest.py, etc. for modified symbol imports
      and autouse fixtures that depend on modified symbols.
  8. Gating test impact: Intersect the affected set from step 6 with gating-marked tests.
    Run: rg -l '@pytest.mark.gating' tests/
    Set True if a gating-marked file also appears in the affected set from 6b-6e.
    Utilities/libs changes often affect gating tests without affecting smoke tests.
    Do NOT stop analysis after concluding Run smoke tests: False.

Output rules:
Do NOT include analysis step numbers (1-8) in your visible output.

Your deliverable:
Your inline informational comment will be based on the following requirements:

Test Execution Plan

  • Run smoke tests: True / False — If True, state the dependency path (test → fixture → changed symbol). True ONLY with a verified path.
  • Run gating tests: True / False — If True, state the dependency path. True if any gating-marked test is in the affected set.
  • Affected tests to run (required when utilities/, libs/, or shared conftest changes — list concrete paths even when smoke is False)

Use these formats:

  • path/to/test_file.py - When the entire test file needs verification
  • path/to/test_file.py::TestClass::test_method - When specific test(s) needed
  • path/to/test_file.py::test_function - When specific test(s) needed
  • -m marker - When a marker covers multiple affected tests (e.g. -m gating only if ALL gating tests in scope need run)
  • Tag each listed test or group with its marker when not obvious, e.g. (gating) or (smoke)

Real test commands (MANDATORY when changes affect session/runtime code):

When the affected code runs at session/collection time (conftest fixtures, pytest plugins,
config hooks, session-scoped setup) or modifies runtime behavior that unit tests mock away,
you MUST include concrete pytest commands the PR author must run on a real cluster
to verify the change works end-to-end. Include:

  • A command for the error/fix path (the scenario the PR fixes)
  • A command for the happy path (regression: the normal case still works)
  • Use lightweight tests (e.g., --collect-only for startup failures,
    a single small test for runtime behavior)
    If the PR only changes test logic (not utilities/libs/conftest), the affected test
    paths themselves serve as the real test commands — no separate section needed.

Example output for a session-startup fix:

**Real tests (cluster required)**
Error path (the fix):
`pytest tests/storage/.../test_foo.py --storage-class-matrix=nonexistent-sc --collect-only`
Expected: ValueError with clear message, not IndexError

Happy path (regression):
`pytest tests/storage/.../test_foo.py --storage-class-matrix=<valid-sc> -k test_bar`
Expected: session starts normally

Guidelines:

  • Include tests affected directly OR via fixture setup/teardown, yield from cleanup, or transitive utility call chains (caller calls modified helper)
  • Use a full file path only if ALL tests in that file require verification
  • Use file path + test name when only specific tests use an affected fixture or utility wrapper (preferred for partial file impact)
  • If a test marker can cover multiple files/tests, provide the marker
  • Balance coverage vs over-testing - Keep descriptions minimal
  • Example: if leaf helper foo() changes, include tests whose fixture teardown calls wrapper bar() where bar() calls foo(), even when the test body only imports an unrelated symbol from the same utilities module

Hardware-Related Checks (SR-IOV, GPU, DPDK):

When PR modifies fixtures for hardware-specific resources:

  • Collection Safety: Fixtures MUST have existence checks (return None when hardware unavailable)
  • Test Plan: MUST verify both WITH and WITHOUT hardware:
    • Run affected tests on cluster WITH hardware
    • Verify collection succeeds on cluster WITHOUT hardware

CRITICAL WORKFLOW COMPLETION RULES:

When responding to this test execution plan request, you MUST follow these rules EXACTLY:

  1. YOUR ONLY DELIVERABLE: Post one non-blocking inline comment containing the test execution plan on the first changed line
  2. THEN STOP IMMEDIATELY - Do NOT generate any additional response
  3. FALLBACK ONLY: If inline comment API calls fail after retrying, post as a regular PR comment
  4. SILENCE = SUCCESS: After successfully submitting the review, your task is complete. No confirmation needed.

ABSOLUTE PROHIBITIONS (violating these creates empty/meaningless reviews):

  • ❌ Do NOT post acknowledgment messages like "Test execution plan posted", "Review posted successfully", "I've successfully posted"
  • ❌ Do NOT mention review IDs, URLs, or confirmation of posting in the PR thread
  • ❌ Do NOT add any follow-up comments after submitting the review
  • ❌ Do NOT reply to confirm task completion
  • ❌ Do NOT explain what you did - just do it and stop

Remember: The pull request review is visible to users. Additional comments are redundant noise.

CRITICAL — Verification rules for smoke and gating decisions:
- For each True decision, you must have traced a concrete path: test file → fixture → utility function → modified symbol.
- Do NOT assume impact based on scope, file proximity, or infrastructure-sounding names.
Only set True when you trace a concrete path through steps 6a-6e, then 7 or 8.
WRONG: "utilities/hco.py changed → run smoke" (no traced dependency path)
WRONG: "Run smoke tests: False" with no affected-test list when gating tests use the changed utility
RIGHT: "Run smoke tests: False, Run gating tests: True" plus tests/.../test_foo.py::TestBar::test_baz (gating)
RIGHT: "Smoke test X uses fixture Y → wrapper Z → changed function W in utilities/hco.py"

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coderabbitai Bot commented Jul 6, 2026

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Tip

For best results, initiate chat on the files or code changes.

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail
REPO="RedHatQE/openshift-virtualization-tests"
PR=5480

HEAD_SHA=$(gh pr view $PR --repo "$REPO" --json headRefOid --jq '.headRefOid')
echo "HEAD_SHA=$HEAD_SHA"

echo "---existing review comments by coderabbitai---"
gh api "/repos/${REPO}/pulls/${PR}/comments" --jq '.[] | select(.user.login=="coderabbitai[bot]") | {id, commit_id, path, line, body: .body[0:80]}'

Length of output: 869


The test execution plan inline comment already exists on tests/storage/cross_cluster_live_migration/test_cclm.py (Line 62) for the current HEAD commit (da5c2c53a223dfb83b915376f21f14f41fc77563). No new commits have been pushed since that comment was posted, so no additional action is required.

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Code Review

Found 1 issue(s) in this PR:

💡 Suggestions (1)

File Line Issue
tests/storage/cross_cluster_live_migration/test_cclm.py 3 [WARNING] The Jira epic:Jira: rename is an out-of-scope cosmetic change.

Review generated by pi

Comment thread tests/storage/cross_cluster_live_migration/test_cclm.py
@josemacassan

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/lgtm

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/approve
/lgtm

@rnetser
rnetser merged commit 6ed6fa5 into RedHatQE:main Jul 9, 2026
26 checks passed
@openshift-virtualization-qe-bot-3

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New container for quay.io/openshift-cnv/openshift-virtualization-tests:latest published

rnetser pushed a commit that referenced this pull request Jul 13, 2026
…5601)

##### What this PR does / why we need it:
Manual cherry-pick of
#4650 and
#5480

1. Cross-storage CCLM support (PR #4650)

- conftest.py — Adds `remote_cluster_source_storage_class`,
`local_cluster_target_storage_class` fixtures and wires them into
`local_cluster_mtv_storage_map` and VM fixtures instead of hardcoding
`py_config["default_storage_class"]`.
- test_cclm.py — Adds `TestCCLMFromStorageAtoB` class that migrates from
`STORAGE_CLASS_A` to `STORAGE_CLASS_B`. Existing test classes updated to
parametrize storage classes (both use STORAGE_CLASS_B for same-storage).
- Shared code moved — `STORAGE_CLASS_A/B`,
`NO_STORAGE_CLASS_FAILURE_MESSAGE`, and
`get_storage_class_for_storage_migration` moved from
`storage_migration/` to shared `storage/constants.py`
  and `storage/utils.py` for reuse by CCLM.

2. STD docstrings (PR #5480)

  - All tests now have proper STD docstrings.

3. Conflict resolution fix (our change)

- utils.py — `verify_compute_live_migration_after_cclm` now accepts
`client: DynamicClient` and passes it to `migrate_vm_and_verify`. This
was needed because the upstream PRs added the client parameter at the
call sites but the function signature didn't have it on this branch.
- test_cclm.py — Added TYPE_CHECKING imports for DynamicClient and
VirtualMachineForTests used in the type hints.


##### Which issue(s) this PR fixes:

##### Special notes for reviewer:

##### jira-ticket:
<!-- full-ticket-url needs to be provided. This would add a link to the
pull request to the jira and close it when the pull request is merged
If the task is not tracked by a Jira ticket, just write "NONE".
-->

---------

Signed-off-by: Jenia Peimer <jpeimer@redhat.com>
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10 participants