build(ariadne): vendor serde crates

third_party/crates/zmij-1.0.23/tests/ryu_comparison.rs

@@ -0,0 +1,36 @@
+use rand::rngs::{SmallRng, SysRng};
+use rand::{Rng as _, SeedableRng as _};
+
+const N: usize = if cfg!(miri) {
+    500
+} else if let b"0" = opt_level::OPT_LEVEL.as_bytes() {
+    1_000_000
+} else {
+    100_000_000
+};
+
+#[test]
+fn ryu_comparison() {
+    let mut ryu_buffer = ryu::Buffer::new();
+    let mut zmij_buffer = zmij::Buffer::new();
+    let mut rng = SmallRng::try_from_rng(&mut SysRng).unwrap();
+    let mut fail = 0;
+
+    for _ in 0..N {
+        let bits = rng.next_u64();
+        let float = f64::from_bits(bits);
+        let ryu = ryu_buffer.format(float);
+        let zmij = zmij_buffer.format(float);
+        let matches = if ryu.contains('e') && !ryu.contains("e-") {
+            ryu.split_once('e') == zmij.split_once("e+")
+        } else {
+            ryu == zmij
+        };
+        if !matches {
+            eprintln!("RYU={ryu} ZMIJ={zmij}");
+            fail += 1;
+        }
+    }
+
+    assert!(fail == 0, "{fail} mismatches");
+}