chore: checkpoint before Python removal

vendor/itoa/tests/test.rs

@@ -0,0 +1,45 @@
+#![allow(non_snake_case)]
+
+macro_rules! test {
+    ($($name:ident($value:expr, $expected:expr))*) => {
+        $(
+            #[test]
+            fn $name() {
+                let mut buffer = itoa::Buffer::new();
+                let s = buffer.format($value);
+                assert_eq!(s, $expected);
+            }
+        )*
+    }
+}
+
+test! {
+    test_u64_0(0u64, "0")
+    test_u64_half(u64::from(u32::MAX), "4294967295")
+    test_u64_max(u64::MAX, "18446744073709551615")
+    test_i64_min(i64::MIN, "-9223372036854775808")
+
+    test_i16_0(0i16, "0")
+    test_i16_min(i16::MIN, "-32768")
+
+    test_u128_0(0u128, "0")
+    test_u128_max(u128::MAX, "340282366920938463463374607431768211455")
+    test_i128_min(i128::MIN, "-170141183460469231731687303715884105728")
+    test_i128_max(i128::MAX, "170141183460469231731687303715884105727")
+}
+
+#[test]
+fn test_max_str_len() {
+    use itoa::Integer as _;
+
+    assert_eq!(i8::MAX_STR_LEN, 4);
+    assert_eq!(u8::MAX_STR_LEN, 3);
+    assert_eq!(i16::MAX_STR_LEN, 6);
+    assert_eq!(u16::MAX_STR_LEN, 5);
+    assert_eq!(i32::MAX_STR_LEN, 11);
+    assert_eq!(u32::MAX_STR_LEN, 10);
+    assert_eq!(i64::MAX_STR_LEN, 20);
+    assert_eq!(u64::MAX_STR_LEN, 20);
+    assert_eq!(i128::MAX_STR_LEN, 40);
+    assert_eq!(u128::MAX_STR_LEN, 39);
+}