There are many unused variables which should be removed

FILE: ...tml/drupal861/modules/blazy/tests/src/Unit/BlazyGridUnitTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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32 | WARNING | Unused variable $key.
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FILE: ...ww/html/drupal861/modules/blazy/tests/src/Unit/BlazyUnitTest.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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131 | WARNING | Unused variable $content.
164 | WARNING | Unused variable $breakpoints.
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FILE: ...les/blazy/tests/src/Kernel/BlazyEntityReferenceFormatterTest.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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111 | WARNING | Unused variable $bundle.
141 | WARNING | Unused variable $entity_type_id.
304 | WARNING | Unused variable $data.
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FILE: ...ml/drupal861/modules/blazy/tests/src/Kernel/BlazyManagerTest.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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205 | WARNING | Unused variable $content.
236 | WARNING | Unused variable $breakpoints_cleaned.
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FILE: .../drupal861/modules/blazy/tests/src/Kernel/BlazyFormatterTest.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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68 | WARNING | Unused variable $definition.
171 | WARNING | Unused variable $display.
173 | WARNING | Unused variable $formatter.
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FILE: ...l861/modules/blazy/tests/src/Kernel/Views/BlazyViewsGridTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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55 | WARNING | Unused variable $settings.
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FILE: ...azy/tests/src/FunctionalJavascript/BlazyFilterJavaScriptTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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84 | WARNING | Unused variable $page.
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FILE: ...les/blazy/tests/src/FunctionalJavascript/BlazyJavaScriptTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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59 | WARNING | Unused variable $page.
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FILE: ...861/modules/blazy/tests/src/Traits/BlazyManagerUnitTestTrait.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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76 | WARNING | Unused variable $key.
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FILE: ...n/Field/FieldFormatter/BlazyTestEntityReferenceFormatterTest.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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122 | WARNING | Unused variable $entity_type.
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