Test `MsgString` concatenation

Test by moving the operands and by borrowing them. Also test appending
to a `MsgString`.

1 files changed, 36 insertions, 0 deletions

diff --git a/android/translations-converter/src/gettext/msg_string.rs b/android/translations-converter/src/gettext/msg_string.rs
index 216bd2fa4e..83bcd90c30 100644
--- a/android/translations-converter/src/gettext/msg_string.rs
+++ b/android/translations-converter/src/gettext/msg_string.rs
@@ -124,4 +124,40 @@ mod tests {
 
         assert_eq!(input.to_string(), original);
     }
+
+    #[test]
+    fn appending() {
+        let mut target = MsgString::from_unescaped(r#""Initial""#);
+        let extra = MsgString::from_escaped(r#"\"Extra\""#);
+
+        target += extra;
+
+        let expected = concat!(r#"\"Initial\"#, r#""\"Extra\""#);
+
+        assert_eq!(target.to_string(), expected);
+    }
+
+    #[test]
+    fn concatenating_by_moving() {
+        let start = MsgString::from_unescaped(r#""Start""#);
+        let end = MsgString::from_escaped(r#"\"End\""#);
+
+        let result = start + end;
+
+        let expected = concat!(r#"\"Start\"#, r#""\"End\""#);
+
+        assert_eq!(result.to_string(), expected);
+    }
+
+    #[test]
+    fn concatenating_by_borrowing() {
+        let start = MsgString::from_escaped(r#"\"Start\""#);
+        let end = MsgString::from_unescaped(r#""End""#);
+
+        let result = &start + &end;
+
+        let expected = concat!(r#"\"Start\"#, r#""\"End\""#);
+
+        assert_eq!(result.to_string(), expected);
+    }
 }