6 string references to plugin.manager.migrate.source

FieldMigration::create in core/modules/migrate_drupal/src/Plugin/migrate/FieldMigration.php
MigrateSourceTestBase::getPlugin in core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php
Instantiates the source plugin under test.
Migration::create in core/modules/migrate/src/Plugin/Migration.php
MigrationProvidersExistTest::testProvidersExist in core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
Tests that modules exist for all source plugins.
NoSourcePluginDecorator::getDefinitions in core/modules/migrate/src/Plugin/NoSourcePluginDecorator.php
QueryBatchTest::getPlugin in core/modules/migrate/tests/src/Kernel/QueryBatchTest.php
Instantiates the source plugin under test.

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