add dubbo transtation filter test

[jasondeng1997]

What this PR does:

Which issue(s) this PR fixes:

Fixes #166

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[106umao]

please link the issue

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@6445fef). Click here to learn what that means. The diff coverage is n/a.

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