Refactor ReleasePipelineStartNotifier spec

Dat Tangrequested to merge
dattang/refactor-ReleasePipelineStartNotifier-spec into master

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Content

  • Refactor ReleasePipelineStartNotifier spec

All the tests for ReleasePipelineStartNotifier are the same with different messages, so we can make a shared_examples and call it multiple time, to make the code clean.

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