Port skybot hash plugin as a module

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/hash.rs

@@ -0,0 +1,76 @@
+use rustbot::bot::module::{Action, Command, Module};
+use rustbot::bot::modules::hash::{md5, sha1, sha256, Hash};
+
+fn cmd<'a>(name: &'a str, args: &'a [&'a str]) -> Command<'a> {
+    Command { sender: "u", reply_to: "#c", name, args, prefix: ">", network: "t" }
+}
+
+fn reply(actions: &[Action]) -> &str {
+    match actions {
+        [Action::Reply(s)] => s,
+        _ => panic!("expected exactly one Reply"),
+    }
+}
+
+const MULTI: &[u8] = b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
+
+#[test]
+fn md5_vectors() {
+    assert_eq!(md5(b""), "d41d8cd98f00b204e9800998ecf8427e");
+    assert_eq!(md5(b"abc"), "900150983cd24fb0d6963f7d28e17f72");
+    assert_eq!(
+        md5(b"The quick brown fox jumps over the lazy dog"),
+        "9e107d9d372bb6826bd81d3542a419d6"
+    );
+    assert_eq!(
+        md5(b"12345678901234567890123456789012345678901234567890123456789012345678901234567890"),
+        "57edf4a22be3c955ac49da2e2107b67a"
+    );
+}
+
+#[test]
+fn sha1_vectors() {
+    assert_eq!(sha1(b""), "da39a3ee5e6b4b0d3255bfef95601890afd80709");
+    assert_eq!(sha1(b"abc"), "a9993e364706816aba3e25717850c26c9cd0d89d");
+    assert_eq!(sha1(MULTI), "84983e441c3bd26ebaae4aa1f95129e5e54670f1");
+}
+
+#[test]
+fn sha256_vectors() {
+    assert_eq!(
+        sha256(b""),
+        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+    );
+    assert_eq!(
+        sha256(b"abc"),
+        "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
+    );
+    assert_eq!(
+        sha256(MULTI),
+        "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1"
+    );
+}
+
+#[test]
+fn module_single_hash() {
+    let mut m = Hash;
+    assert_eq!(
+        reply(&m.on_command(&cmd("sha256", &["abc"]))),
+        "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
+    );
+}
+
+#[test]
+fn module_all_hashes() {
+    let mut m = Hash;
+    let r = reply(&m.on_command(&cmd("hash", &["abc"]))).to_string();
+    assert!(r.contains("md5: 900150983cd24fb0d6963f7d28e17f72"), "{r}");
+    assert!(r.contains("sha1: a9993e364706816aba3e25717850c26c9cd0d89d"), "{r}");
+    assert!(r.contains("sha256: ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"), "{r}");
+}
+
+#[test]
+fn module_usage_when_empty() {
+    let mut m = Hash;
+    assert!(reply(&m.on_command(&cmd("md5", &[]))).contains("usage"));
+}