Apply suggestions from code review

Co-authored-by: Dave Smith <[email protected]>

tests/phpunit/tests/theme/wpThemeJson.php

@@ -5277,7 +5277,7 @@ public function test_resolve_variables() {
 		 * WP_Theme_JSON_Resolver. WP_Theme_JSON_Resolver::get_block_data() sets blockGap for supported blocks to `null` if the value is not defined.
 		 */
 		$this->assertNull( $styles['blocks']['core/post-template']['spacing']['blockGap'], 'core/post-template block: blockGap', 'Post Template block's spacing blockGap should be null' );
-		$this->assertEquals( $spacing, $styles['blocks']['core/columns']['spacing']['blockGap'], 'core/columns block: blockGap' );
+		$this->assertEquals( $spacing, $styles['blocks']['core/columns']['spacing']['blockGap'], 'core/columns block: blockGap', 'Columns block's spacing blockGap should match' );
 	}
 
 	/**