Fix format output to suppress success message and use standard test fixtures

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

Author: Copilot

features/language-core.feature

@@ -487,21 +487,12 @@ Feature: Manage core translation files for a WordPress install
       """
       []
       """
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty
 
     When I run `wp language core update --format=csv`
     Then STDOUT should be empty
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty
 
     When I run `wp language core update --format=summary`
     Then STDOUT should be empty
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty

features/language-plugin.feature

@@ -448,38 +448,21 @@ Feature: Manage plugin translation files for a WordPress install
   @require-wp-4.0
   Scenario: Plugin translation update with format flag
     Given a WP install
-    And a wp-content/plugins/test-plugin/test-plugin.php file:
-      """
-      <?php
-      /*
-      Plugin Name: Test Plugin
-      Version: 1.0.0
-      */
-      """
 
-    When I run `wp plugin activate test-plugin`
+    When I run `wp plugin install hello-dolly --force`
     Then STDERR should be empty
 
-    When I run `wp language plugin update test-plugin --format=json`
+    When I run `wp language plugin update hello-dolly --format=json`
     Then STDOUT should be:
       """
       []
       """
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty
 
     When I run `wp language plugin update --all --format=csv`
     Then STDOUT should be empty
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty
 
     When I run `wp language plugin update --all --format=summary`
     Then STDOUT should be empty
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty

features/language-theme.feature

@@ -332,37 +332,21 @@ Feature: Manage theme translation files for a WordPress install
   @require-wp-4.0
   Scenario: Theme translation update with format flag
     Given a WP install
-    And a wp-content/themes/test-theme/style.css file:
-      """
-      /*
-      Theme Name: Test Theme
-      Version: 1.0.0
-      */
-      """
 
-    When I run `wp theme activate test-theme`
+    When I try `wp theme install twentyten`
     Then STDERR should be empty
 
-    When I run `wp language theme update test-theme --format=json`
+    When I run `wp language theme update twentyten --format=json`
     Then STDOUT should be:
       """
       []
       """
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty
 
     When I run `wp language theme update --all --format=csv`
     Then STDOUT should be empty
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty
 
     When I run `wp language theme update --all --format=summary`
     Then STDOUT should be empty
-    And STDERR should contain:
-      """
-      Success: Translations are up to date.
-      """
+    And STDERR should be empty

src/WP_CLI/CommandWithTranslation.php

@@ -33,10 +33,13 @@ public function update( $args, $assoc_args ) {
 		$format  = Utils\get_flag_value( $assoc_args, 'format' );
 
 		if ( empty( $updates ) ) {
-			if ( $format && in_array( $format, array( 'json', 'csv' ), true ) ) {
-				Utils\format_items( $format, array(), array() );
+			if ( $format ) {
+				if ( in_array( $format, array( 'json', 'csv' ), true ) ) {
+					Utils\format_items( $format, array(), array() );
+				}
+			} else {
+				WP_CLI::success( 'Translations are up to date.' );
 			}
-			WP_CLI::success( 'Translations are up to date.' );
 
 			return;
 		}