✅ test: add unit test for src/utils/fetch/fetchSSE.ts

[gru-agent]

Trigger Info

Trigger Type	Triggered By	Source File	Assignment
Push	arvinxx	src/utils/fetch/fetchSSE.ts	Detail

Summary

This PR introduces unit tests for the fetchSSE utility function, ensuring its behavior is validated across various scenarios. The tests cover the following cases:

• Successful Text Streaming: Verifies that text messages are correctly handled and concatenated, and the onFinish callback is invoked with the expected result.

• Tool Calls Streaming: Ensures that tool call events are processed and passed to the onMessageHandle callback.

• Citations Streaming: Confirms that citation events are handled and passed correctly.

• Reasoning Streaming: Tests the handling of reasoning events and their delivery to the onMessageHandle callback.

• Abort Handling: Validates that the onAbort callback is triggered when an abort event occurs.

• Error Handling: Ensures that errors are captured and passed to the onErrorHandle callback.

The fetchEventSource function is mocked to simulate different streaming scenarios, and all relevant callbacks are tested for proper invocation with expected arguments. This ensures robust coverage of the fetchSSE functionality.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.42%. Comparing base (cab591d) to head (b58ac19).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6347      +/-   ##
==========================================
+ Coverage   91.41%   91.42%   +0.01%     
==========================================
  Files         688      688              
  Lines       63021    63021              
  Branches     4372     3141    -1231     
==========================================
+ Hits        57608    57615       +7     
+ Misses       5413     5406       -7     

Flag	Coverage Δ
app	91.42% <ø> (+0.01%)	⬆️
server	97.56% <ø> (ø)

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