An apparatus and methods for testing the integrity of a barrier coating on a vessel. An off gas test fixture includes a face seal positioned about an opening of the vessel. A side seal is positioned about a portion of the vessel's wall and separated from the face seal by a space. Additionally, a cover may be secured to the fixture that encompasses an interface portion of the fixture and the vessel. Before and/or during testing, gas in the space between the side and face seals may be evacuated, as well as gas present in an interior area of the vessel. The vessel may be exposed to test gas(es) that is soluble by the plastic material of the vessel before and/or after being secured to the fixture. During testing, test gas(es) desorbed by the vessel may be evacuated, with the molecular flow being measured using a mass extraction unit.

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