Add some CorePassSearchSpace tests

Src/FinderOuter/Services/SearchSpaces/CorePassSearchSpace.cs

@@ -50,7 +50,7 @@ public bool Process(string hex, int passLength, out string error)
             }
             if (result.Length < 70)
             {
-                error = $"Input hex was expected to be 70 bytes but it is {result.Length} bytes.";
+                error = $"Input hex is expected to be at least 70 bytes but it is {result.Length} bytes.";
                 return false;
             }
 
@@ -138,6 +138,13 @@ public bool Process(string hex, int passLength, out string error)
             AssertArray(salt, saltLen);
             AssertArray(encKey, 48);
 #endif
+
+            if (passLength < 1)
+            {
+                error = "Password length must be at least 1.";
+                return false;
+            }
+
             PasswordLength = passLength;
             Iteration = iteration;
             Salt = salt;

Src/Tests/Services/SearchSpaces/CorePassSearchSpaceTests.cs

@@ -0,0 +1,95 @@
+// The FinderOuter
+// Copyright (c) 2020 Coding Enthusiast
+// Distributed under the MIT software license, see the accompanying
+// file LICENCE or http://www.opensource.org/licenses/mit-license.php.
+
+using FinderOuter.Services.SearchSpaces;
+using System.Collections.Generic;
+
+namespace Tests.Services.SearchSpaces
+{
+    public class CorePassSearchSpaceTests
+    {
+        public static IEnumerable<object[]> GetProcessCases()
+        {
+            // Taken from: https://bitcointalk.org/index.php?topic=5511431.msg64607294#msg64607294
+            yield return new object[]
+            {
+                "43000130ac71182a748152bb788fb9deb11f2f5a55f5e848d66586747cc000826d4c0c350032153d50cbf924a2ac1dc5f6279436089ca0271b64c0e66f00000000c6fe040000",
+                2,
+                true, string.Empty,
+                Helper.HexToBytes("9ca0271b64c0e66f"),
+                Helper.HexToBytes("55f5e848d66586747cc000826d4c0c35"),
+                327366
+            };
+            yield return new object[]
+            {
+                "43000130ac71182a748152bb788fb9deb11f2f5a55f5e848d66586747cc000826d4c0c350032153d50cbf924a2ac1dc5f6279436089ca0271b64c0e66f00000000c6fe040000",
+                0,
+                false, "Password length must be at least 1.",
+                null, null, 0
+            };
+            yield return new object[]
+            {
+                "43000130ac71182a748152bb788fb9deb11f2f5a55f5e848d66586747cc000826d4c0c350032153d50cbf924a2ac1dc5f6279436089ca0271b64c0e66f00000000c6fe040000",
+                -1,
+                false, "Password length must be at least 1.",
+                null, null, 0
+            };
+            yield return new object[]
+            {
+                null,
+                2,
+                false, "Input hex can not be null or empty.",
+                null, null, 0
+            };
+            yield return new object[]
+            {
+                "abcx",
+                2,
+                false, "Invalid character \"x\" found at index=3.",
+                null, null, 0
+            };
+            yield return new object[]
+            {
+                "abc",
+                2,
+                false, "Invalid hex string.",
+                null, null, 0
+            };
+            yield return new object[]
+            {
+                "abcd",
+                2,
+                false, "Input hex is expected to be at least 70 bytes but it is 2 bytes.",
+                null, null, 0
+            };
+            yield return new object[]
+            {
+                Helper.GetBytesHex(70),
+                2,
+                false, "Could not find 0x43000130 in the given hex.",
+                null, null, 0
+            };
+        }
+
+        [Theory]
+        [MemberData(nameof(GetProcessCases))]
+        public void ProcessTest(string hex, int passLength, bool expected, string expError, byte[] expSalt, byte[] expXor, int expIter)
+        {
+            CorePassSearchSpace searchSpace = new();
+            bool actual = searchSpace.Process(hex, passLength, out string error);
+
+            Assert.Equal(expected, actual);
+            Assert.Equal(expError, error);
+
+            if (expected)
+            {
+                Assert.Equal(searchSpace.PasswordLength, passLength);
+                Assert.Equal(searchSpace.Salt, expSalt);
+                Assert.Equal(searchSpace.XOR, expXor);
+                Assert.Equal(searchSpace.Iteration, expIter);
+            }
+        }
+    }
+}