Reinforce tests for `--list-themes`

tests/integration_tests.rs

@@ -300,6 +300,7 @@ fn list_themes_without_colors() {
 
     bat()
         .arg("--color=never")
+        .arg("--decorations=always") // trick bat into setting `Config::loop_through` to false
         .arg("--list-themes")
         .assert()
         .success()
@@ -307,6 +308,15 @@ fn list_themes_without_colors() {
         .stdout(predicate::str::contains(default_theme_chunk).normalize());
 }
 
+#[test]
+fn list_themes_to_piped_output() {
+    bat()
+        .arg("--list-themes")
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("(default)").not());
+}
+
 #[test]
 #[cfg_attr(any(not(feature = "git"), target_os = "windows"), ignore)]
 fn short_help() {