Adding a regression test for corefx#42576

diff --git a/src/libraries/Common/tests/System/RealFormatterTestsBase.netcoreapp.cs b/src/libraries/Common/tests/System/RealFormatterTestsBase.netcoreapp.cs
index 69fa4db..34317f5 100644 (file)
--- a/src/libraries/Common/tests/System/RealFormatterTestsBase.netcoreapp.cs
+++ b/src/libraries/Common/tests/System/RealFormatterTestsBase.netcoreapp.cs
@@ -15,6 +15,10 @@ namespace System.Tests
         protected abstract string InvariantToStringSingle(float f, string format);
 
         [Theory]
+        [InlineData(1.23E+22, "1.23E+22")] // corefx#42576
+        public void TestFormatterDouble_Shortest(double value, string expectedResult) => TestFormatterDouble_Standard(value, "R", expectedResult);
+
+        [Theory]
         [InlineData(double.Epsilon, "\u00A40.00")]
         [InlineData(double.MaxValue, "\u00A4179,769,313,486,231,570,814,527,423,731,704,356,798,070,567,525,844,996,598,917,476,803,157,260,780,028,538,760,589,558,632,766,878,171,540,458,953,514,382,464,234,321,326,889,464,182,768,467,546,703,537,516,986,049,910,576,551,282,076,245,490,090,389,328,944,075,868,508,455,133,942,304,583,236,903,222,948,165,808,559,332,123,348,274,797,826,204,144,723,168,738,177,180,919,299,881,250,404,026,184,124,858,368.00")]
         [InlineData(Math.E, "\u00A42.72")]