diff --git a/phpunit/block-supports/block-style-variations-test.php b/phpunit/block-supports/block-style-variations-test.php
index 62fa923dbdd7e9..870a76a4fb4a49 100644
--- a/phpunit/block-supports/block-style-variations-test.php
+++ b/phpunit/block-supports/block-style-variations-test.php
@@ -94,22 +94,6 @@ public function test_add_registered_block_styles_to_theme_data() {
 			),
 		);
 
-		/*
-		 * This style is to be deliberately overwritten by the theme.json partial
-		 * See `phpunit/data/themedir1/block-theme/styles/block-style-variation-with-slug.json`.
-		 */
-		register_block_style(
-			'core/group',
-			array(
-				'name'       => 'WithSlug',
-				'style_data' => array(
-					'color' => array(
-						'background' => 'whitesmoke',
-						'text'       => 'black',
-					),
-				),
-			)
-		);
 		register_block_style(
 			'core/group',
 			array(
@@ -122,12 +106,6 @@ public function test_add_registered_block_styles_to_theme_data() {
 		$group_styles = $theme_json['styles']['blocks']['core/group'] ?? array();
 		$expected     = array(
 			'variations' => array(
-				'WithSlug'                => array(
-					'color' => array(
-						'background' => 'aliceblue',
-						'text'       => 'midnightblue',
-					),
-				),
 				'my-variation'            => $variation_styles_data,
 
 				/*
@@ -151,7 +129,6 @@ public function test_add_registered_block_styles_to_theme_data() {
 		);
 
 		unregister_block_style( 'core/group', 'my-variation' );
-		unregister_block_style( 'core/group', 'WithSlug' );
 
 		$this->assertSameSetsWithIndex( $group_styles, $expected );
 	}
diff --git a/phpunit/class-wp-theme-json-resolver-test.php b/phpunit/class-wp-theme-json-resolver-test.php
index 6333c3d1dd7760..50e1d9d846899e 100644
--- a/phpunit/class-wp-theme-json-resolver-test.php
+++ b/phpunit/class-wp-theme-json-resolver-test.php
@@ -1118,18 +1118,6 @@ public function data_get_style_variations() {
 							),
 						),
 					),
-					array(
-						'blockTypes' => array( 'core/group', 'core/columns' ),
-						'version'    => 3,
-						'slug'       => 'WithSlug',
-						'title'      => 'With Slug',
-						'styles'     => array(
-							'color' => array(
-								'background' => 'aliceblue',
-								'text'       => 'midnightblue',
-							),
-						),
-					),
 				),
 			),
 		);
diff --git a/phpunit/data/themedir1/block-theme/styles/block-style-variation-with-slug.json b/phpunit/data/themedir1/block-theme/styles/block-style-variation-with-slug.json
deleted file mode 100644
index d938a8a0db833c..00000000000000
--- a/phpunit/data/themedir1/block-theme/styles/block-style-variation-with-slug.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-	"version": 3,
-	"blockTypes": [ "core/group", "core/columns" ],
-	"slug": "WithSlug",
-	"title": "With Slug",
-	"styles": {
-		"color": {
-			"background": "aliceblue",
-			"text": "midnightblue"
-		}
-	}
-}