karma: karmaweb command + web-board link on top lists, via configurable karma_url

tests/karma.rs

@@ -259,3 +259,38 @@ fn replies_in_spanish_for_es_locale() {
     let _ = std::fs::remove_file(&path);
     let _ = std::fs::remove_file(&log);
 }
+
+#[test]
+fn karmaweb_command_and_leaderboard_suffix() {
+    let path = std::env::temp_dir().join("rubot-test-karma-web.json");
+    let log = std::env::temp_dir().join("rubot-test-karma-web.events.jsonl");
+    let _ = std::fs::remove_file(&path);
+    let _ = std::fs::remove_file(&log);
+    let mut k =
+        Karma::with_path(path.clone()).with_url(Some("https://karma.devtronic.pro/".to_string()));
+    // dedicated command returns the link
+    let w = reply_of(&mut k, "karmaweb", &[]);
+    assert!(w.contains("https://karma.devtronic.pro/"), "{w}");
+    // link is appended to the aggregate list...
+    k.on_message(&chat("a", "rust++ python++"));
+    let top = reply_of(&mut k, "karma", &[]);
+    assert!(top.starts_with("karma top:"), "{top}");
+    assert!(
+        top.contains("full board: https://karma.devtronic.pro/"),
+        "{top}"
+    );
+    // ...but not to a single-thing lookup (kept clean)
+    let one = reply_of(&mut k, "karma", &["rust"]);
+    assert!(!one.contains("http"), "{one}");
+    let _ = std::fs::remove_file(&path);
+    let _ = std::fs::remove_file(&log);
+}
+
+#[test]
+fn karmaweb_without_url_is_graceful() {
+    let path = std::env::temp_dir().join("rubot-test-karma-nourl.json");
+    let _ = std::fs::remove_file(&path);
+    let mut k = Karma::with_path(path.clone());
+    assert!(reply_of(&mut k, "karmaweb", &[]).contains("no web board configured"));
+    let _ = std::fs::remove_file(&path);
+}