Add new test to validate TOTP codes generation

src/data/totp_key.rs

@@ -95,3 +95,22 @@ impl TotpKey {
         Ok(self.current_code()?.eq(code) || self.previous_code()?.eq(code))
     }
 }
+
+#[cfg(test)]
+mod test {
+    use crate::data::totp_key::TotpKey;
+
+    #[test]
+    fn test_timing() {
+        let key = TotpKey::new_random();
+        let code = key.current_code().unwrap();
+        let old_code = key.previous_code().unwrap();
+        assert_ne!(code, old_code);
+    }
+
+    #[test]
+    fn test_generation() {
+        let key = TotpKey::from_encoded_secret("JBSWY3DPEHPK3PXP");
+        assert_eq!("124851", key.get_code_at(|| 1650470683).unwrap());
+    }
+}