From 972c4fc4e06e00a50fb979ab7f4d3e7296924019 Mon Sep 17 00:00:00 2001
From: Paolo Barbolini <paolo.barbolini@m4ss.net>
Date: Fri, 22 Nov 2024 20:55:00 +0100
Subject: [PATCH] test: fix 3 blind spots reported by cargo-mutants

---
 src/body/base64.rs     | 2 +-
 src/body/chooser.rs    | 8 +++++++-
 src/headers/rfc2231.rs | 8 ++++++++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/body/base64.rs b/src/body/base64.rs
index adb9172..ce6a221 100644
--- a/src/body/base64.rs
+++ b/src/body/base64.rs
@@ -70,7 +70,7 @@ pub fn encode(b: &[u8], w: &mut dyn Write) -> fmt::Result {
 pub fn encoded_len(input_len: usize) -> usize {
     let mut base64_len = input_len / 3 * 4;
     if input_len % 3 != 0 {
-        base64_len += 4 - base64_len % 4;
+        base64_len += 4;
     }
     let mut crlf_len = base64_len / LINE_LEN * CRLF.len();
     if crlf_len >= CRLF.len() && base64_len % LINE_LEN == 0 {
diff --git a/src/body/chooser.rs b/src/body/chooser.rs
index 30fe5ec..0225244 100644
--- a/src/body/chooser.rs
+++ b/src/body/chooser.rs
@@ -226,7 +226,13 @@ mod tests {
 
     #[test]
     fn not_too_long_multiline() {
-        let input = concat!("0123\n", "4567").as_bytes();
+        let input = concat!(
+            "0123\n",
+            "4567\n",
+            "00000000000000000000000000000000000000000\n",
+            "89"
+        )
+        .as_bytes();
 
         assert!(!line_too_long(input));
     }
diff --git a/src/headers/rfc2231.rs b/src/headers/rfc2231.rs
index ef6973a..c3f289f 100644
--- a/src/headers/rfc2231.rs
+++ b/src/headers/rfc2231.rs
@@ -372,4 +372,12 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    #[should_panic(expected = "`key` must only be composed of ascii alphanumeric chars")]
+    fn non_ascii_key() {
+        let mut s = String::new();
+        let mut w = EmailWriter::new(&mut s, 0, 0, true);
+        let _ = encode("📬", "", &mut w);
+    }
 }