Test alphabet-related panics

slowli · Sep 24, 2023 · ade3e8a · ade3e8a
1 parent 65445a5
commit ade3e8a
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Showing 2 changed files with 19 additions and 1 deletion.
diff --git a/src/decoder.rs b/src/decoder.rs
@@ -63,7 +63,7 @@ impl Encoding {
             let byte = alphabet_bytes[index];
             compile_assert!(
                 byte < 0x80,
-                "Alphabet '", alphabet => clip(64, ""), "' contains non-ASCII character at ",
+                "Alphabet '", alphabet => clip(64, ""), "' contains non-ASCII character at position ",
                 index => fmt::<usize>()
             );
             let byte_idx = byte as usize;

diff --git a/src/tests.rs b/src/tests.rs
@@ -102,6 +102,24 @@ fn mixed_base64_alphabet_leads_to_panic() {
     Decoder::Base64.decode::<6>(b"Pj4-Pz8/");
 }
 
+#[test]
+#[should_panic(expected = "Invalid alphabet length 5; must be one of 2, 4, 8, 16, 32, or 64")]
+fn invalid_alphabet_length() {
+    Decoder::custom("what?");
+}
+
+#[test]
+#[should_panic(expected = "Alphabet 'teß' contains non-ASCII character at position 2")]
+fn non_ascii_char_in_alphabet() {
+    Decoder::custom("teß");
+}
+
+#[test]
+#[should_panic(expected = "Alphabet character 'a' is mentioned several times")]
+fn duplicate_char_in_alphabet() {
+    Decoder::custom("alphabet");
+}
+
 #[test]
 #[should_panic(expected = "input decodes to 6 bytes, while type inference implies 3.")]
 fn input_length_overflow() {