add IsPrefix test cases for Platforms differences (#41017)

Author: adamsitnik

src/System.Globalization/tests/CompareInfo/CompareInfoTests.IsPrefix.cs

@@ -12,6 +12,7 @@ public class CompareInfoIsPrefixTests
  private static CompareInfo s_invariantCompare = CultureInfo.InvariantCulture.CompareInfo;
  private static CompareInfo s_hungarianCompare = new CultureInfo("hu-HU").CompareInfo;
  private static CompareInfo s_turkishCompare = new CultureInfo("tr-TR").CompareInfo;
+ private static CompareInfo s_frenchCompare = new CultureInfo("fr-FR").CompareInfo;
 
  public static IEnumerable<object[]> IsPrefix_TestData()
  {
@@ -55,6 +56,8 @@ public static IEnumerable<object[]> IsPrefix_TestData()
 
  // Platform differences
  yield return new object[] { s_hungarianCompare, "dzsdzsfoobar", "ddzsf", CompareOptions.None, PlatformDetection.IsWindows ? true : false };
+ yield return new object[] { s_invariantCompare, "''Tests", "Tests", CompareOptions.IgnoreSymbols, PlatformDetection.IsWindows ? true : false };
+ yield return new object[] { s_frenchCompare, "\u0153", "oe", CompareOptions.None, PlatformDetection.IsWindows ? true : false };
  }
 
  [Theory]