Add web modules (crypto, wiki, define, urban, tinyurl, down) + shared http/json

tests/tier4.rs

@@ -0,0 +1,50 @@
+use rustbot::bot::modules::crypto::format_ticker;
+use rustbot::bot::modules::define::format_define;
+use rustbot::bot::modules::down::host_of;
+use rustbot::bot::modules::urban::format_urban;
+use rustbot::bot::modules::wiki::{format_summary, pick_title};
+
+#[test]
+fn crypto_formats_ticker() {
+    let body = r#"{"last":"63836.11","high":"64658.00","low":"63477.46","volume":"1032.2"}"#;
+    let out = format_ticker("btc", body);
+    assert!(out.contains("BTC/USD: $63836.11"), "{out}");
+    assert!(out.contains("high $64658.00"), "{out}");
+    assert!(out.contains("low $63477.46"), "{out}");
+}
+
+#[test]
+fn wiki_picks_title_and_formats_summary() {
+    let os = r#"["Rust programming",["Rust (programming language)"],[""],["https://en.wikipedia.org/wiki/Rust_(programming_language)"]]"#;
+    assert_eq!(
+        pick_title(os).as_deref(),
+        Some("Rust (programming language)")
+    );
+    let sum = r#"{"title":"Rust (programming language)","extract":"Rust is a language."}"#;
+    assert_eq!(
+        format_summary(sum),
+        "Rust (programming language) — Rust is a language."
+    );
+}
+
+#[test]
+fn define_formats_first_meaning() {
+    let body = r#"[{"word":"hello","meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"a greeting"}]}]}]"#;
+    assert_eq!(format_define("hello", body), "hello (noun): a greeting");
+}
+
+#[test]
+fn urban_formats_and_strips_brackets() {
+    let body = "{\"list\":[{\"word\":\"irc\",\"definition\":\"[Internet] Relay\\r\\nChat\"}]}";
+    let out = format_urban("irc", body);
+    assert!(out.starts_with("irc: Internet Relay"), "{out}");
+    assert!(!out.contains('['), "{out}");
+}
+
+#[test]
+fn down_parses_host() {
+    assert_eq!(host_of("https://example.com/path?x=1"), "example.com");
+    assert_eq!(host_of("example.com:8080"), "example.com");
+    assert_eq!(host_of("user@host.net"), "host.net");
+    assert_eq!(host_of("//foo.org/"), "foo.org");
+}