From 92a291b71de716657102224bb32d1c3e410e8d14 Mon Sep 17 00:00:00 2001
From: Nicolas Boichat <nicolas@boichat.ch>
Date: Fri, 7 Mar 2025 12:48:22 +0100
Subject: [PATCH] test: printf: Add nan, inf, negative zero

Add a few end-to-end tests for printf of unusual floats (nan,
infinity, negative zero).
---
 tests/by-util/test_printf.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tests/by-util/test_printf.rs b/tests/by-util/test_printf.rs
index 5d1d300dd..098218d6c 100644
--- a/tests/by-util/test_printf.rs
+++ b/tests/by-util/test_printf.rs
@@ -886,6 +886,30 @@ fn float_with_zero_precision_should_pad() {
         .stdout_only("-01");
 }
 
+#[test]
+fn float_non_finite() {
+    new_ucmd!()
+        .args(&[
+            "%f %f %F %f %f %F",
+            "nan",
+            "-nan",
+            "nan",
+            "inf",
+            "-inf",
+            "inf",
+        ])
+        .succeeds()
+        .stdout_only("nan -nan NAN inf -inf INF");
+}
+
+#[test]
+fn float_zero_neg_zero() {
+    new_ucmd!()
+        .args(&["%f %f", "0.0", "-0.0"])
+        .succeeds()
+        .stdout_only("0.000000 -0.000000");
+}
+
 #[test]
 fn precision_check() {
     new_ucmd!()