Add failing test case demonstrating sprintf negative zero bug dotnet#…

…15557
jwosty · Dec 13, 2024 · 21a6776 · 21a6776
1 parent 471fdc8
commit 21a6776
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core/Microsoft.FSharp.Core/PrintfTests.fs b/tests/FSharp.Core.UnitTests/FSharp.Core/Microsoft.FSharp.Core/PrintfTests.fs
@@ -75,6 +75,16 @@ type PrintfTests() =
         Assert.AreEqual("      7B", sprintf "%*X"  8 123  )
         Assert.AreEqual("7B      ", sprintf "%-*X" 8 123  ) 
 
+
+    [<Fact>]
+    member this.``positive and negative zero``() =
+        test "%f" +0.0 "0.000000"
+        test "%f" -0.0 "-0.000000"
+        test "%f" -0.0000001 "-0.000000"
+        test "%+f" +0.0 "+0.000000"
+        test "%+f" -0.0 "-0.000000"
+        test "%+f" -0.0000001 "-0.000000"
+
     [<Fact>]
     member _.``union case formatting`` () =
         Assert.AreEqual("CaseOne", sprintf "%A" CaseOne)