test(help): Show styled wrapping behavior

Author: epage

Cargo.lock

@@ -71,6 +71,7 @@ unicode-width = { version = "0.2.0", optional = true }
 static_assertions = "1.1.0"
 unic-emoji-char = "0.9.0"
 color-print = "0.3.6"
+snapbox = { version = "0.6.16" }
 
 [lints]
 workspace = true

clap_builder/Cargo.toml

@@ -209,3 +209,43 @@ impl std::fmt::Display for StyledStr {
         Ok(())
     }
 }
+
+#[cfg(test)]
+#[cfg(feature = "wrap_help")]
+mod wrap_tests {
+    use super::*;
+
+    use snapbox::assert_data_eq;
+    use snapbox::str;
+
+    #[test]
+    #[cfg(feature = "wrap_help")]
+    fn wrap_unstyled() {
+        let style = anstyle::Style::new();
+        let input = format!("{style}12345{style:#} {style}12345{style:#} {style}12345{style:#} {style}12345{style:#}");
+        let mut actual = StyledStr::new();
+        actual.push_string(input);
+        actual.wrap(20);
+        assert_data_eq!(
+            actual.ansi().to_string(),
+            str![[r#"
+12345 12345 12345
+12345
+"#]]
+        );
+    }
+
+    #[test]
+    #[cfg(feature = "wrap_help")]
+    fn wrap_styled() {
+        let style = anstyle::Style::new().bold();
+        let input = format!("{style}12345{style:#} {style}12345{style:#} {style}12345{style:#} {style}12345{style:#}");
+        let mut actual = StyledStr::new();
+        actual.push_string(input);
+        actual.wrap(20);
+        assert_data_eq!(
+            actual.ansi().to_string(),
+            str!["12345 12345 12345 12345"]
+        );
+    }
+}