Fix incorrect declarations of private fields in unit tests

These fields were incorrectly set as `shared`. They must be instance members.

Author: jozefizso

src/Kavod.Vba.Compression.Tests/CompressionExamples.cs

@@ -14,9 +14,9 @@ public class NoCompression
         private const string ExpectedDecompressedOutput =
             "61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 2E";
 
-        private static byte[] _expectedCompressedBytes;
-        private static byte[] _expectedDecompressedBytes;
-        private static byte[] _compressionInputBytes;
+        private readonly byte[] _expectedCompressedBytes;
+        private readonly byte[] _expectedDecompressedBytes;
+        private readonly byte[] _compressionInputBytes;
 
         public NoCompression()
         {
@@ -62,9 +62,9 @@ public class NormalCompression
             "23 61 61 61 62 63 64 65 66 61 61 61 61 67 68 69 6a 61 61 61 61 61 6B 6C 61 61 61 6D 6E 6F 70 71" +
             "61 61 61 61 61 61 61 61 61 61 61 61 72 73 74 75 76 77 78 79 7A 61 61 61";
 
-        private static byte[] _expectedCompressedBytes;
-        private static byte[] _expectedDecompressedBytes;
-        private static byte[] _compressionInputBytes;
+        private readonly byte[] _expectedCompressedBytes;
+        private readonly byte[] _expectedDecompressedBytes;
+        private readonly byte[] _compressionInputBytes;
 
         public NormalCompression()
         {
@@ -106,9 +106,9 @@ public class MaximumCompression
             "61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61" +
             "61 61 61 61 61 61 61 61 61";
 
-        private static byte[] _expectedCompressedBytes;
-        private static byte[] _expectedDecompressedBytes;
-        private static byte[] _compressionInputBytes;
+        private readonly byte[] _expectedCompressedBytes;
+        private readonly byte[] _expectedDecompressedBytes;
+        private readonly byte[] _compressionInputBytes;
 
         public MaximumCompression()
         {

src/Kavod.Vba.Compression.Tests/TestCompressedContainer.cs

@@ -6,8 +6,8 @@ namespace Kavod.Vba.Compression.Tests
 {
     public class TestCompressedContainer
     {
-        static byte[] _validCompressedDirStream;
-        static byte[] _validDecompressedDirStream;
+        private readonly byte[] _validCompressedDirStream;
+        private readonly byte[] _validDecompressedDirStream;
 
         public TestCompressedContainer()
         {