test: Add improving test coverage for MultiQueryExpander, StreamHelper, and Query classes #4473
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Description
This PR adds missing test coverage for several core classes in the Spring AI framework, improving test reliability and catching potential edge cases.
Changes
MultiQueryExpanderTests
IllegalArgumentException
when chatClientBuilder is nullStreamHelperTests
eventToChatCompletionResponse
correctly processesAnthropicApi.PingEvent
QueryTests
toString()
format includes class name and text content