tests: Add test for double-width utf-8 characters

tests/all/mod.rs

@@ -10,3 +10,4 @@ mod presets_test;
 mod property_test;
 mod simple_test;
 mod styling_test;
+mod utf_8_characters;

tests/all/utf_8_characters.rs

@@ -0,0 +1,33 @@
+use pretty_assertions::assert_eq;
+
+use comfy_table::*;
+
+#[test]
+fn simple_emoji_table() {
+    let mut table = Table::new();
+    table
+        .set_header(&vec!["Header1", "Header2", "Header3"])
+        .add_row(&vec![
+            "This is a text",
+            "This is another text",
+            "This is the third text",
+        ])
+        .add_row(&vec![
+            "This is another text",
+            "Now\nadd some\nmulti line stuff",
+            "✅",
+        ]);
+
+    println!("{}", table.to_string());
+    let expected = "
++----------------------+----------------------+------------------------+
+| Header1              | Header2              | Header3                |
++======================================================================+
+| This is a text       | This is another text | This is the third text |
+|----------------------+----------------------+------------------------|
+| This is another text | Now                  | ✅                     |
+|                      | add some             |                        |
+|                      | multi line stuff     |                        |
++----------------------+----------------------+------------------------+";
+    assert_eq!("\n".to_string() + &table.to_string(), expected);
+}