Update ExtensionUpgraderSkin to properly handle themes and add theme update test

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

features/theme-update.feature

@@ -154,3 +154,25 @@ Feature: Update WordPress themes
       """
       1.1.1
       """
+
+  @require-wp-4.5
+  Scenario: Updating all themes should show the name of each theme as it is updated
+    Given a WP install
+    And I run `wp theme delete --all --force`
+
+    When I run `wp theme install moina --version=1.0.2`
+    Then STDOUT should not be empty
+
+    When I run `wp theme install twentytwelve --version=1.0`
+    Then STDOUT should not be empty
+
+    When I try `wp theme update --all`
+    Then STDOUT should contain:
+      """
+      Updating Moina...
+      """
+
+    And STDOUT should contain:
+      """
+      Success: Updated 2 of 2 themes.
+      """

src/WP_CLI/ExtensionUpgraderSkin.php

@@ -17,8 +17,8 @@ class ExtensionUpgraderSkin extends UpgraderSkin {
 	public function before() {
 		if ( isset( $this->plugin_info ) && is_array( $this->plugin_info ) && isset( $this->plugin_info['Name'] ) ) {
 			WP_CLI::log( sprintf( 'Updating %s...', html_entity_decode( $this->plugin_info['Name'], ENT_QUOTES, get_bloginfo( 'charset' ) ) ) );
-		} elseif ( isset( $this->theme_info ) && is_array( $this->theme_info ) && isset( $this->theme_info['Name'] ) ) {
-			WP_CLI::log( sprintf( 'Updating %s...', html_entity_decode( $this->theme_info['Name'], ENT_QUOTES, get_bloginfo( 'charset' ) ) ) );
+		} elseif ( isset( $this->theme_info ) && is_object( $this->theme_info ) && method_exists( $this->theme_info, 'get' ) ) {
+			WP_CLI::log( sprintf( 'Updating %s...', html_entity_decode( $this->theme_info->get( 'Name' ), ENT_QUOTES, get_bloginfo( 'charset' ) ) ) );
 		}
 	}
 }