[Fix] Update gemini-2.0-flash to gemini-2.5-flash in test_gemini

[yuneng-berri]

Summary

Failure Path (Before Fix)

Integration tests in llm_translation_testing (test_gemini) using gemini/gemini-2.0-flash fail with a 404 error because gemini-2.0-flash is no longer available to new users.

Fix

Updated all 3 instances of gemini/gemini-2.0-flash to gemini/gemini-2.5-flash in tests/llm_translation/test_gemini.py:

• test_gemini_with_grounding (streaming call)
• test_gemini_with_empty_function_call_arguments
• test_gemini_tool_use

Testing

• llm_translation_testing with test_gemini

Type

🐛 Bug Fix
✅ Test

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview, Comment	Mar 30, 2026 8:55pm

[codspeed-hq]

Merging this PR will not alter performance

✅ 16 untouched benchmarks

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_{Comparing litellm_/strange-jackson (b39748d) with main (1757e1d)}

[greptile-apps]

Greptile Summary

This PR updates three existing integration tests in tests/llm_translation/test_gemini.py from gemini/gemini-2.0-flash to gemini/gemini-2.5-flash to fix 404 errors caused by gemini-2.0-flash no longer being available to new users. The change is purely mechanical — no test logic, assertions, or structure is altered.

• The model name swap is applied consistently across all three affected tests: test_gemini_with_grounding, test_gemini_with_empty_function_call_arguments, and test_gemini_tool_use.
• The updated model is in the same Gemini family and the tests cover the same capabilities (grounding/search, empty function-call arguments, and streaming tool-use), so test coverage equivalence is maintained.
• All three tests (test_gemini_with_grounding, test_gemini_with_empty_function_call_arguments, test_gemini_tool_use) make live network calls to the Gemini API rather than using mocks. This pre-existed this PR but is worth noting: the tests/llm_translation/ directory policy is to use only mock tests. The nearby test_claude_tool_use_with_gemini (added in the same file) demonstrates the preferred mocked approach.
• The PR description does not include passing test output or CI run evidence to confirm the fix resolves the 404s, which is recommended per contribution guidelines.

Confidence Score: 5/5

• Safe to merge — the change is a straightforward model-name update with no logic or assertion changes.
• All findings are P2 (style/policy observations). The model-name swap is correct, no test coverage is weakened, and the tests still validate the same functionality. Pre-existing live-call issues are not introduced by this PR.
• No files require special attention beyond the pre-existing real-network-call pattern in tests/llm_translation/test_gemini.py.

Important Files Changed

Filename	Overview
tests/llm_translation/test_gemini.py	Updates 3 occurrences of gemini/gemini-2.0-flash → gemini/gemini-2.5-flash in existing integration tests; no logic changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[test_gemini_with_grounding] -->|model param| B["gemini/gemini-2.5-flash\n(was gemini-2.0-flash)"]
    C[test_gemini_with_empty_function_call_arguments] -->|model param| B
    D[test_gemini_tool_use] -->|model param| B
    B --> E[Gemini API Live Call]
    E --> F{Response}
    F -->|200 OK| G[Assertions pass]
    F -->|404 Not Found\ngemini-2.0-flash removed| H[Test fails ❌]

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Comments Outside Diff (1)

1. tests/llm_translation/test_gemini.py, line 534-574 (link)

   Tests make real network calls

   test_gemini_with_grounding and test_gemini_with_empty_function_call_arguments (and test_gemini_tool_use at line 806) call litellm.completion() without any mocking, making live API requests to the Gemini network. The repo policy for tests/llm_translation/ is that only mock tests should live here, to ensure reliable execution in CI and for all developers locally.

   While these tests were not introduced by this PR, updating them perpetuates the issue. Consider converting them to use unittest.mock.patch or a similar approach (see test_claude_tool_use_with_gemini just above as a good example of a properly mocked test in the same file).

   Rule Used: What: prevent any tests from being added here that... (source)

_{Reviews (1): Last reviewed commit: "[Fix] Update gemini-2.0-flash to gemini-..." | Re-trigger Greptile}

[ryan-crabbe-berri]

lgtm