6 files declare their use of OEmbedTestTrait

MediaSourceOEmbedVideoTest.php in core/modules/media/tests/src/FunctionalJavascript/MediaSourceOEmbedVideoTest.php
MediaStandardProfileTest.php in core/modules/media/tests/src/FunctionalJavascript/MediaStandardProfileTest.php
OEmbedFormatterTest.php in core/modules/media/tests/src/Functional/FieldFormatter/OEmbedFormatterTest.php
ResourceFetcherTest.php in core/modules/media/tests/src/Functional/ResourceFetcherTest.php
UrlResolverTest.php in core/modules/media/tests/src/Functional/UrlResolverTest.php
WidgetOEmbedTest.php in core/modules/media_library/tests/src/FunctionalJavascript/WidgetOEmbedTest.php

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