Reuse test constants

Author: sakno

src/DotNext.Tests/Buffers/BufferWriterTests.cs

@@ -343,7 +343,7 @@ public static void Rendering()
     [InlineData(124)]
     public static void WriteStringBuilder(int stringLength)
     {
-        var str = Random.Shared.NextString("abcdefghijklmnopqrstuvwxyz", stringLength);
+        var str = Random.Shared.NextString(Alphabet, stringLength);
 
         var builder = new StringBuilder();
         for (var i = 0; i < 3; i++)
@@ -364,7 +364,7 @@ public static void WriteStringBuilder(int stringLength)
     [InlineData(124)]
     public static void WriteStringBuilder2(int stringLength)
     {
-        var str = Random.Shared.NextString("abcdefghijklmnopqrstuvwxyz", stringLength);
+        var str = Random.Shared.NextString(Alphabet, stringLength);
 
         var builder = new StringBuilder();
         for (var i = 0; i < 3; i++)

src/DotNext.Tests/Buffers/ChunkSequenceTests.cs

@@ -102,7 +102,7 @@ public static void CopyFromSequence()
     [InlineData(124)]
     public static void StringBuilderToSequence(int stringLength)
     {
-        var str = Random.Shared.NextString("abcdefghijklmnopqrstuvwxyz", stringLength);
+        var str = Random.Shared.NextString(Alphabet, stringLength);
 
         var builder = new StringBuilder();
         for (var i = 0; i < 3; i++)

src/DotNext.Tests/Buffers/SpanReaderWriterTests.cs

@@ -403,7 +403,7 @@ public static void Rendering()
     [InlineData(124)]
     public static void WriteStringBuilder(int stringLength)
     {
-        var str = Random.Shared.NextString("abcdefghijklmnopqrstuvwxyz", stringLength);
+        var str = Random.Shared.NextString(Alphabet, stringLength);
 
         var builder = new StringBuilder();
         for (var i = 0; i < 3; i++)

src/DotNext.Tests/Net/Cluster/Consensus/Raft/TransportServices/TransportTestSuite.cs

@@ -64,9 +64,9 @@ internal LocalMember(bool smallAmountOfMetadata = false)
                 metadata.Add("a", "b");
             else
             {
-                const string AllowedChars = "abcdefghijklmnopqrstuvwxyz1234567890";
+                const string allowedChars = Alphabet + Numbers;
                 for (var i = 0; i < 20; i++)
-                    metadata.Add(string.Concat("key", i.ToString()), Random.Shared.NextString(AllowedChars, 20));
+                    metadata.Add(string.Concat("key", i.ToString()), Random.Shared.NextString(allowedChars, 20));
             }
             Metadata = metadata.ToImmutableDictionary();
         }

src/DotNext.Tests/Test.cs

@@ -8,6 +8,10 @@ namespace DotNext;
 [ExcludeFromCodeCoverage]
 public abstract class Test : Assert
 {
+    protected const string Alphabet = "abcdefghijklmnopqrstuvwxyz";
+    protected const string AlphabetUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXY";
+    protected const string Numbers = "0123456789";
+    
     private protected static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(20);
 
     private protected static byte[] RandomBytes(int size)