Add unit tests

phpunit/class-wp-theme-json-test.php

@@ -5410,4 +5410,81 @@ public function test_scope_style_node_selectors() {
 
 		$this->assertEquals( $expected, $actual );
 	}
+
+	/**
+	 * Block style variations styles aren't generated by default. This test covers
+	 * the `get_block_nodes` does not include variations by default, preventing
+	 * the inclusion of their styles.
+	 */
+	public function test_opt_out_of_block_style_variations_by_default() {
+		$theme_json = new ReflectionClass( 'WP_Theme_JSON_Gutenberg' );
+
+		$func = $theme_json->getMethod( 'get_block_nodes' );
+		$func->setAccessible( true );
+
+		$theme_json = array(
+			'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+			'styles'  => array(
+				'blocks' => array(
+					'core/button' => array(
+						'variations' => array(
+							'outline' => array(
+								'color' => array(
+									'background' => 'red',
+								),
+							),
+						),
+					),
+				),
+			),
+		);
+		$selectors  = array();
+
+		$block_nodes       = $func->invoke( null, $theme_json, $selectors );
+		$button_variations = $block_nodes[0]['variations'] ?? array();
+
+		$this->assertEquals( array(), $button_variations );
+	}
+
+	/**
+	 * Block style variations styles aren't generated by default. This test ensures
+	 * variations are included by `get_block_nodes` when requested.
+	 */
+	public function test_opt_in_to_block_style_variations() {
+		$theme_json = new ReflectionClass( 'WP_Theme_JSON_Gutenberg' );
+
+		$func = $theme_json->getMethod( 'get_block_nodes' );
+		$func->setAccessible( true );
+
+		$theme_json = array(
+			'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+			'styles'  => array(
+				'blocks' => array(
+					'core/button' => array(
+						'variations' => array(
+							'outline' => array(
+								'color' => array(
+									'background' => 'red',
+								),
+							),
+						),
+					),
+				),
+			),
+		);
+		$selectors  = array();
+		$options    = array( 'block_style_variations' => true );
+
+		$block_nodes       = $func->invoke( null, $theme_json, $selectors, $options );
+		$button_variations = $block_nodes[0]['variations'] ?? array();
+
+		$expected = array(
+			array(
+				'path'     => array( 'styles', 'blocks', 'core/button', 'variations', 'outline' ),
+				'selector' => '.wp-block-button.is-style-outline .wp-block-button__link',
+			),
+		);
+
+		$this->assertEquals( $expected, $button_variations );
+	}
 }