Add test for blowfish module

src/blowfish.rs

@@ -145,3 +145,18 @@ impl Blowfish {
         (r ^ self.p[0], l ^ self.p[1])
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_encrypt() {
+        let blowfish = Blowfish::new(b"test_case");
+
+        let expected_encrypted = [63, 149, 97, 229, 5, 35, 46, 128, 194, 107, 69, 132, 85, 202, 2, 126];
+
+        assert_eq!(blowfish.encrypt(b"hello, world!").unwrap(), expected_encrypted);
+        assert_eq!(String::from_utf8(blowfish.decrypt(&expected_encrypted).unwrap()).unwrap(), "hello, world!\0\0\0");
+    }
+}