Add Integration Test Fixtures for External Providers

[Abd-Standard]

Description:
Create reusable mocks or fixtures for notification providers so contributors can test provider failures without relying on external services.

Acceptance Criteria:

Successful responses can be simulated.
Timeout and failure responses can be simulated.
Tests do not require live provider credentials.

[shobhamerabacha-star]

Hey team,

I would like to resolve this issue. Here is my proposed execution plan:

• Implementation: Implement robust automated tests covering Add Integration Test Fixtures for External Providers with clean isolation and assertion checks.
• Testing: Verify all test cases pass locally and in the GitHub Actions CI workflow.

I can start working on this right away. Please assign!

[MRTEEworld02]

@MRTEEworld02 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

hi pls can you assign me this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @MRTEEworld02 to this issue.

[Opulencechuks]

@Opulencechuks has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I am confident that I can implement this having worked on something similar in the past

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Opulencechuks to this issue.

[drips-wave]

Congratulations, @Opulencechuks! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @Opulencechuks: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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