Enhance snapshot naming and improve formatting utilities

src/Snapshooter.MSTest/MSTestSnapshotFullNameReader.cs

@@ -130,9 +130,8 @@ private static string GetMethodSnapshotName(MethodBase method)
             DataRowAttribute currentRow =
                 dataRowAttributes.ElementAt(dataTestMethodRowIndex[method.Name]);
 
-            return $"{method.DeclaringType.Name}." +
-                method.Name +
-                $"_{string.Join("_", currentRow.Data.Select(d => d.ToString()))}";
+            return $"{method.DeclaringType.Name}.{method.Name}" +
+                SnapshotNameExtension.Create(currentRow.Data).ToParamsString();
         }
     }
 }

src/Snapshooter/Core/MatchOperators/AcceptMatchOperator.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Snapshooter.Exceptions;
@@ -137,7 +138,7 @@ private void VerifyFieldType(string path, object field)
             }
         }
 
-        private string CreateAcceptExceptionMessage(
+        private static string CreateAcceptExceptionMessage(
             string path, object field, string message)
         {
             return
@@ -147,9 +148,16 @@ private string CreateAcceptExceptionMessage(
                 $"{message}";
         }
 
-        private string GetAcceptFieldValueString(object field)
+        private static string GetAcceptFieldValueString(object field)
         {
-            return field is { } ? field.ToString() : "Null";
+            return field switch
+            {
+                null => "Null",
+                decimal decimalValue => decimalValue.ToString(CultureInfo.InvariantCulture),
+                double doubleValue => doubleValue.ToString(CultureInfo.InvariantCulture),
+                float floatValue => floatValue.ToString(CultureInfo.InvariantCulture),
+                _ => field.ToString()
+            };
         }
     }
 }

test/Snapshooter.Xunit.Tests/AcceptMatchOption/TestHelpers/AcceptAssert.cs

@@ -6,6 +6,7 @@
 using Snapshooter.Core;
 using Snapshooter.Exceptions;
 using Xunit;
+using System.Globalization;
 
 #nullable enable
 
@@ -62,9 +63,18 @@ public static void AssertAcceptWrongTypeExceptionCase<TAccept, TTestee>(
                 Assert.Equal(exception.Message,
                     $"Accept match option failed, " +
                     $"because the field value of '{nameof(testee.Value)}' " +
-                    $"is '{testeeValue ?? testee.Value!.ToString()}', " +
+                    $"is '{testeeValue ?? FormatInvariant(testee.Value)}', " +
                     $"and therefore not of type '{typeName}'.");
             }
         }
+
+        private static string FormatInvariant(object? value)
+        {
+            if (value == null) return "Null";
+            if (value is decimal d) return d.ToString(CultureInfo.InvariantCulture);
+            if (value is double db) return db.ToString(CultureInfo.InvariantCulture);
+            if (value is float f) return f.ToString(CultureInfo.InvariantCulture);
+            return value.ToString()!;
+        }
     }
 }

test/Snapshooter.Xunit3.Tests/AcceptMatchOption/TestHelpers/AcceptAssert.cs

@@ -6,6 +6,7 @@
 using Snapshooter.Core;
 using Snapshooter.Exceptions;
 using Xunit;
+using System.Globalization;
 
 #nullable enable
 
@@ -62,9 +63,18 @@ public static void AssertAcceptWrongTypeExceptionCase<TAccept, TTestee>(
                 Assert.Equal(exception.Message,
                     $"Accept match option failed, " +
                     $"because the field value of '{nameof(testee.Value)}' " +
-                    $"is '{testeeValue ?? testee.Value!.ToString()}', " +
+                    $"is '{testeeValue ?? FormatInvariant(testee.Value)}', " +
                     $"and therefore not of type '{typeName}'.");
             }
         }
+
+        private static string FormatInvariant(object? value)
+        {
+            if (value == null) return "Null";
+            if (value is decimal d) return d.ToString(CultureInfo.InvariantCulture);
+            if (value is double db) return db.ToString(CultureInfo.InvariantCulture);
+            if (value is float f) return f.ToString(CultureInfo.InvariantCulture);
+            return value.ToString()!;
+        }
     }
 }