fix integration test by adding the missing comma

[anggao]

What this PR does / why we need it:

Add a missing comma to fix the integration test

Which issue(s) this PR fixes:

Fixes #2526

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[seldondev]

Hi @anggao. Thanks for your PR.

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[seldondev]

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