6 string references to twig.extension

HelpTopicsSyntaxTest::register in core/modules/help/tests/src/Kernel/HelpTopicsSyntaxTest.php
Registers test-specific services.
TwigExtensionPass::process in core/lib/Drupal/Core/DependencyInjection/Compiler/TwigExtensionPass.php
TwigExtensionTest::testRenderMarkup in core/modules/system/tests/src/Functional/Theme/TwigExtensionTest.php
Tests output of MarkupInterface of TwigExtension->renderVar().
TwigExtensionTest::testRenderStrategies in core/modules/system/tests/src/Functional/Theme/TwigExtensionTest.php
Test if Drupal html strategy is done and the fallback to Twig itself works.
TwigExtensionTest::testsRenderEscapedZeroValue in core/modules/system/tests/src/Functional/Theme/TwigExtensionTest.php
Tests output of integer and double 0 values of TwigExtension::escapeFilter().
TwigExtensionTest::testsRenderZeroValue in core/modules/system/tests/src/Functional/Theme/TwigExtensionTest.php
Tests output of integer and double 0 values of TwigExtension->renderVar().

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