Better hash, Parse and ToString support, Tests

BeefLibs/corlib/src/Guid.bf

@@ -1,73 +1,724 @@
-namespace System
+namespace System;
+
+struct Guid : IHashable, IParseable<Guid>
 {
-	struct Guid : IHashable, IParseable<Guid>
+	public static readonly Guid Empty = Guid();
+
+	private uint32 mA;
+	private uint16 mB;
+	private uint16 mC;
+	private uint8 mD;
+	private uint8 mE;
+	private uint8 mF;
+	private uint8 mG;
+	private uint8 mH;
+	private uint8 mI;
+	private uint8 mJ;
+	private uint8 mK;
+
+	public this()
+	{
+		this = default;
+	}
+
+	public this(uint32 a, uint16 b, uint16 c, uint8 d, uint8 e, uint8 f, uint8 g, uint8 h, uint8 i, uint8 j, uint8 k)
+	{
+		mA = a;
+		mB = b;
+		mC = c;
+		mD = d;
+		mE = e;
+		mF = f;
+		mG = g;
+		mH = h;
+		mI = i;
+		mJ = j;
+		mK = k;
+	}
+
+	public int GetHashCode()
+	{
+		int hash1 = (int)mA;
+		int hash2 = ((int)mB << 16) | (int)mC;
+		int hash3 = ((int)mD << 24) | ((int)mE << 16) | ((int)mF << 8) | (int)mG;
+		int hash4 = ((int)mH << 24) | ((int)mI << 16) | ((int)mJ << 8) | (int)mK;
+
+		return hash1 ^ hash2 ^ hash3 ^ hash4;
+	}
+
+	[Commutable]
+	public static bool operator ==(Guid val1, Guid val2)
 	{
-		public static readonly Guid Empty = Guid();
-        
-        private uint32 mA;
-        private uint16 mB;
-        private uint16 mC;
-        private uint8 mD;
-        private uint8 mE;
-        private uint8 mF;
-        private uint8 mG;
-        private uint8 mH;
-        private uint8 mI;
-        private uint8 mJ;
-        private uint8 mK;
-
-		public this()
-		{
-			this = default;
-		}
-
-		public this(uint32 a, uint16 b, uint16 c, uint8 d, uint8 e, uint8 f, uint8 g, uint8 h, uint8 i, uint8 j, uint8 k)
-		{
-			mA = a;
-			mB = b;
-			mC = c;
-			mD = d;
-			mE = e;
-			mF = f;
-			mG = g;
-			mH = h;
-			mI = i;
-			mJ = j;
-			mK = k;
-		}
-
-		public int GetHashCode()
-		{
-			return (int)mA ^ (int)mK;
-		}
-
-		[Commutable]
-		public static bool operator==(Guid val1, Guid val2)
-		{
-			return 
-                (val1.mA == val2.mA) &&
-				(val1.mB == val2.mB) &&
-				(val1.mC == val2.mC) &&
-				(val1.mD == val2.mD) &&
-				(val1.mE == val2.mE) &&
-				(val1.mF == val2.mF) &&
-				(val1.mG == val2.mG) &&
-				(val1.mH == val2.mH) &&
-				(val1.mI == val2.mI) &&
-				(val1.mJ == val2.mJ) &&
-				(val1.mK == val2.mK);
-		}
-
-		public static Result<Guid> Parse(StringView val)
-		{
-			return .Err;
-		}
-
-		public static Guid Create()
-		{
-			Guid guid = ?;
-			Platform.BfpSystem_CreateGUID(&guid);
-			return guid;
-		}
+		return
+			(val1.mA == val2.mA) &&
+			(val1.mB == val2.mB) &&
+			(val1.mC == val2.mC) &&
+			(val1.mD == val2.mD) &&
+			(val1.mE == val2.mE) &&
+			(val1.mF == val2.mF) &&
+			(val1.mG == val2.mG) &&
+			(val1.mH == val2.mH) &&
+			(val1.mI == val2.mI) &&
+			(val1.mJ == val2.mJ) &&
+			(val1.mK == val2.mK);
 	}
+
+	public static Guid Create()
+	{
+		Guid guid = ?;
+		Platform.BfpSystem_CreateGUID(&guid);
+		return Guid(guid.[Friend]mA,
+			guid.[Friend]mB,
+			guid.[Friend]mC,
+			guid.[Friend]mD,
+			guid.[Friend]mE,
+			guid.[Friend]mF,
+			guid.[Friend]mG,
+			guid.[Friend]mH,
+			guid.[Friend]mI,
+			guid.[Friend]mJ,
+			guid.[Friend]mK);
+	}
+
+	public void ToString(String strBuffer, char8 format = 'D')
+	{
+	    switch(format)
+	    {
+	    case 'N', 'n':
+	        // 32 digits: 00000000000000000000000000000000
+	        strBuffer.AppendF("{0,8:x8}{1,4:x4}{2,4:x4}{3,2:x2}{4,2:x2}{5,2:x2}{6,2:x2}{7,2:x2}{8,2:x2}{9,2:x2}{10,2:x2}", 
+	            mA, mB, mC, mD, mE, mF, mG, mH, mI, mJ, mK);
+	        
+	    case 'D', 'd':
+	        // 32 digits separated by hyphens: 00000000-0000-0000-0000-000000000000
+	        strBuffer.AppendF("{0,8:x8}-{1,4:x4}-{2,4:x4}-{3,2:x2}{4,2:x2}-{5,2:x2}{6,2:x2}{7,2:x2}{8,2:x2}{9,2:x2}{10,2:x2}", 
+	            mA, mB, mC, mD, mE, mF, mG, mH, mI, mJ, mK);
+	        
+	    case 'B', 'b':
+	        // 32 digits separated by hyphens, enclosed in braces: {00000000-0000-0000-0000-000000000000}
+	        strBuffer.AppendF("{{{0,8:x8}-{1,4:x4}-{2,4:x4}-{3,2:x2}{4,2:x2}-{5,2:x2}{6,2:x2}{7,2:x2}{8,2:x2}{9,2:x2}{10,2:x2}}}", 
+	            mA, mB, mC, mD, mE, mF, mG, mH, mI, mJ, mK);
+	        
+	    case 'P', 'p':
+	        // 32 digits separated by hyphens, enclosed in parentheses: (00000000-0000-0000-0000-000000000000)
+	        strBuffer.AppendF("({0,8:x8}-{1,4:x4}-{2,4:x4}-{3,2:x2}{4,2:x2}-{5,2:x2}{6,2:x2}{7,2:x2}{8,2:x2}{9,2:x2}{10,2:x2})", 
+	            mA, mB, mC, mD, mE, mF, mG, mH, mI, mJ, mK);
+	        
+	    case 'X', 'x':
+	        // Four hexadecimal values enclosed in braces: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}
+	        strBuffer.AppendF("{{0x{0,8:x8},0x{1,4:x4},0x{2,4:x4},{{0x{3,2:x2},0x{4,2:x2},0x{5,2:x2},0x{6,2:x2},0x{7,2:x2},0x{8,2:x2},0x{9,2:x2},0x{10,2:x2}}}}}", 
+	            mA, mB, mC, mD, mE, mF, mG, mH, mI, mJ, mK);
+	        
+	    default:
+	        // Default to 'D' format
+	        strBuffer.AppendF("{0,8:x8}-{1,4:x4}-{2,4:x4}-{3,2:x2}{4,2:x2}-{5,2:x2}{6,2:x2}{7,2:x2}{8,2:x2}{9,2:x2}{10,2:x2}", 
+	            mA, mB, mC, mD, mE, mF, mG, mH, mI, mJ, mK);
+	    }
+	}
+
+	public override void ToString(String strBuffer)
+	{
+	    ToString(strBuffer, 'D');
+	}
+
+	public static Result<Guid> Parse(StringView val)
+	{
+		var val;
+	    if (val.IsEmpty)
+	        return .Err;
+
+		String str = scope .(val);
+		str.Trim();
+	    
+	    // Determine format based on string characteristics
+	    if (str.StartsWith("{0x") && str.EndsWith("}}"))
+	    {
+	        // X format: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}
+	        return ParseXFormat(str);
+	    }
+	    else if (str.StartsWith("{") && str.EndsWith("}"))
+	    {
+	        // B format: {00000000-0000-0000-0000-000000000000}
+	        return ParseDashFormat(str.Substring(1, str.Length - 2));
+	    }
+	    else if (str.StartsWith("(") && str.EndsWith(")"))
+	    {
+	        // P format: (00000000-0000-0000-0000-000000000000)
+	        return ParseDashFormat(str.Substring(1, str.Length - 2));
+	    }
+	    else if (str.Contains('-'))
+	    {
+	        // D format: 00000000-0000-0000-0000-000000000000
+	        return ParseDashFormat(str);
+	    }
+	    else if (str.Length == 32)
+	    {
+	        // N format: 00000000000000000000000000000000
+	        return ParseNFormat(str);
+	    }
+	    
+	    return .Err;
+	}
+
+	private static Result<Guid> ParseDashFormat(StringView val)
+	{
+	    // Expected format: 00000000-0000-0000-0000-000000000000
+	    StringView[5] parts = ?;
+	    int partCount = 0;
+	    
+	    for (var part in val.Split('-'))
+	    {
+	        if (partCount >= 5)
+	            return .Err;
+	        parts[partCount] = part;
+	        partCount++;
+	    }
+	    
+	    if (partCount != 5)
+	        return .Err;
+	    
+	    if (parts[0].Length != 8 || parts[1].Length != 4 || parts[2].Length != 4 || 
+	        parts[3].Length != 4 || parts[4].Length != 12)
+	        return .Err;
+	    
+	    // Parse each part
+	    if (uint32.Parse(parts[0], .HexNumber) case .Ok(let a) &&
+	        uint16.Parse(parts[1], .HexNumber) case .Ok(let b) &&
+	        uint16.Parse(parts[2], .HexNumber) case .Ok(let c))
+	    {
+	        // Parse the 8 bytes from parts[3] and parts[4]
+	        String part3and4 = scope String()..Append(parts[3])..Append(parts[4]);
+	        
+	        if (part3and4.Length != 16)
+	            return .Err;
+	        
+	        uint8[8] bytes = ?;
+	        for (int i = 0; i < 8; i++)
+	        {
+	            StringView byteStr = part3and4.Substring(i * 2, 2);
+	            if (uint8.Parse(byteStr, .HexNumber) case .Ok(let byteVal))
+	                bytes[i] = byteVal;
+	            else
+	                return .Err;
+	        }
+	        
+	        return .Ok(Guid(a, b, c, bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7]));
+	    }
+	    
+	    return .Err;
+	}
+
+	private static Result<Guid> ParseNFormat(StringView val)
+	{
+	    // Expected format: 00000000000000000000000000000000 (32 hex chars)
+	    if (val.Length != 32)
+	        return .Err;
+	    
+	    // Parse as: aaaaaaaa bbbb cccc ddee ffgghhiijjkk
+	    if (uint32.Parse(val.Substring(0, 8), .HexNumber) case .Ok(let a) &&
+	        uint16.Parse(val.Substring(8, 4), .HexNumber) case .Ok(let b) &&
+	        uint16.Parse(val.Substring(12, 4), .HexNumber) case .Ok(let c))
+	    {
+	        uint8[8] bytes = ?;
+	        for (int i = 0; i < 8; i++)
+	        {
+	            StringView byteStr = val.Substring(16 + i * 2, 2);
+	            if (uint8.Parse(byteStr, .HexNumber) case .Ok(let byteVal))
+	                bytes[i] = byteVal;
+	            else
+	                return .Err;
+	        }
+	        
+	        return .Ok(Guid(a, b, c, bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7]));
+	    }
+	    
+	    return .Err;
+	}
+
+	private static Result<Guid> ParseXFormat(StringView val)
+	{
+	    // Expected format: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}
+	    StringView inner = val.Substring(1, val.Length - 2); // Remove outer braces
+	    
+	    if (!inner.StartsWith("0x"))
+	        return .Err;
+	    
+	    // Find the inner brace section
+	    int innerBraceStart = inner.IndexOf('{');
+	    if (innerBraceStart == -1)
+	        return .Err;
+	    
+	    int innerBraceEnd = inner.LastIndexOf('}');
+	    if (innerBraceEnd == -1 || innerBraceEnd <= innerBraceStart)
+	        return .Err;
+	    
+	    // Parse the first three parts before the inner braces
+	    StringView firstPart = inner.Substring(0, innerBraceStart - 1); // Remove trailing comma
+	    StringView[3] mainParts = ?;
+	    int mainPartCount = 0;
+	    
+	    for (var part in firstPart.Split(','))
+	    {
+	        if (mainPartCount >= 3)
+	            return .Err;
+	        mainParts[mainPartCount] = part;
+	        mainPartCount++;
+	    }
+	    
+	    if (mainPartCount != 3)
+	        return .Err;
+	    
+	    // Parse main parts (remove 0x prefix)
+	    if (uint32.Parse(mainParts[0].Substring(2), .HexNumber) case .Ok(let a) &&
+	        uint16.Parse(mainParts[1].Substring(2), .HexNumber) case .Ok(let b) &&
+	        uint16.Parse(mainParts[2].Substring(2), .HexNumber) case .Ok(let c))
+	    {
+	        // Parse the 8 bytes in the inner braces
+	        StringView innerBytes = inner.Substring(innerBraceStart + 1, innerBraceEnd - innerBraceStart - 1);
+	        StringView[8] byteParts = ?;
+	        int bytePartCount = 0;
+	        
+	        for (var part in innerBytes.Split(','))
+	        {
+	            if (bytePartCount >= 8)
+	                return .Err;
+	            byteParts[bytePartCount] = scope :: String(part)..Trim();
+	            bytePartCount++;
+	        }
+	        
+	        if (bytePartCount != 8)
+	            return .Err;
+	        
+	        uint8[8] bytes = ?;
+	        for (int i = 0; i < 8; i++)
+	        {
+	            StringView bytePart = byteParts[i];
+	            if (!bytePart.StartsWith("0x"))
+	                return .Err;
+	                
+	            if (uint8.Parse(bytePart.Substring(2), .HexNumber) case .Ok(let byteVal))
+	                bytes[i] = byteVal;
+	            else
+	                return .Err;
+	        }
+	        
+	        return .Ok(Guid(a, b, c, bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7]));
+	    }
+	    
+	    return .Err;
+	}
+}
+
+#if TEST
+class GUIDTests
+{
+    // Test GUID for consistent testing
+    private static Guid GetTestGUID()
+    {
+        return Guid(0x550e8400, 0xe29b, 0x41d4, 0xa7, 0x16, 0x44, 0x66, 0x55, 0x44, 0x00, 0x00);
+    }
+
+    [Test]
+    public static void Constructor()
+    {
+        var guid = Guid(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0);
+        
+        // Test that we can access the values (indirectly through ToString)
+        String str = scope String();
+        guid.ToString(str, 'N');
+        Test.Assert(str == "1234567812345678123456789abcdef0");
+    }
+
+    [Test]
+    public static void EmptyGUID()
+    {
+        var empty = Guid.Empty;
+        String str = scope String();
+        empty.ToString(str, 'D');
+        Test.Assert(str == "00000000-0000-0000-0000-000000000000");
+    }
+
+    [Test]
+    public static void Equality()
+    {
+        var guid1 = GetTestGUID();
+        var guid2 = GetTestGUID();
+        var guid3 = Guid(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0);
+
+        Test.Assert(guid1 == guid2);
+        Test.Assert(!(guid1 == guid3));
+        Test.Assert(!(guid2 == guid3));
+    }
+
+    [Test]
+    public static void HashCode()
+    {
+        var guid1 = GetTestGUID();
+        var guid2 = GetTestGUID();
+        var guid3 = Guid(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0);
+
+        // Same GUIDs should have same hash code
+        Test.Assert(guid1.GetHashCode() == guid2.GetHashCode());
+        
+        // Different GUIDs should likely have different hash codes (not guaranteed, but very likely)
+        Test.Assert(guid1.GetHashCode() != guid3.GetHashCode());
+    }
+
+    [Test]
+    public static void ToString_NFormat()
+    {
+        var guid = GetTestGUID();
+        String str = scope String();
+        
+        guid.ToString(str, 'N');
+        Test.Assert(str == "550e8400e29b41d4a716446655440000");
+        
+        str.Clear();
+        guid.ToString(str, 'n');
+        Test.Assert(str == "550e8400e29b41d4a716446655440000");
+    }
+
+    [Test]
+    public static void ToString_DFormat()
+    {
+        var guid = GetTestGUID();
+        String str = scope String();
+        
+        guid.ToString(str, 'D');
+        Test.Assert(str == "550e8400-e29b-41d4-a716-446655440000");
+        
+        str.Clear();
+        guid.ToString(str, 'd');
+        Test.Assert(str == "550e8400-e29b-41d4-a716-446655440000");
+        
+        // Test default format
+        str.Clear();
+        guid.ToString(str);
+        Test.Assert(str == "550e8400-e29b-41d4-a716-446655440000");
+    }
+
+    [Test]
+    public static void ToString_BFormat()
+    {
+        var guid = GetTestGUID();
+        String str = scope String();
+        
+        guid.ToString(str, 'B');
+        Test.Assert(str == "{550e8400-e29b-41d4-a716-446655440000}");
+        
+        str.Clear();
+        guid.ToString(str, 'b');
+        Test.Assert(str == "{550e8400-e29b-41d4-a716-446655440000}");
+    }
+
+    [Test]
+    public static void ToString_PFormat()
+    {
+        var guid = GetTestGUID();
+        String str = scope String();
+        
+        guid.ToString(str, 'P');
+        Test.Assert(str == "(550e8400-e29b-41d4-a716-446655440000)");
+        
+        str.Clear();
+        guid.ToString(str, 'p');
+        Test.Assert(str == "(550e8400-e29b-41d4-a716-446655440000)");
+    }
+
+    [Test]
+    public static void ToString_XFormat()
+    {
+        var guid = GetTestGUID();
+        String str = scope String();
+        
+        guid.ToString(str, 'X');
+        Test.Assert(str == "{0x550e8400,0xe29b,0x41d4,{0xa7,0x16,0x44,0x66,0x55,0x44,0x00,0x00}}");
+        
+        str.Clear();
+        guid.ToString(str, 'x');
+        Test.Assert(str == "{0x550e8400,0xe29b,0x41d4,{0xa7,0x16,0x44,0x66,0x55,0x44,0x00,0x00}}");
+    }
+
+    [Test]
+    public static void ToString_InvalidFormat()
+    {
+        var guid = GetTestGUID();
+        String str = scope String();
+        
+        // Invalid format should default to 'D' format
+        guid.ToString(str, 'Z');
+        Test.Assert(str == "550e8400-e29b-41d4-a716-446655440000");
+    }
+
+    [Test]
+    public static void Parse_DFormat()
+    {
+        String testStr = "550e8400-e29b-41d4-a716-446655440000";
+        
+        if (Guid.Parse(testStr) case .Ok(let parsed))
+        {
+            var expected = GetTestGUID();
+            Test.Assert(parsed == expected);
+        }
+        else
+        {
+            Test.Assert(false); // Parse should have succeeded
+        }
+    }
+
+    [Test]
+    public static void Parse_NFormat()
+    {
+        String testStr = "550e8400e29b41d4a716446655440000";
+        
+        if (Guid.Parse(testStr) case .Ok(let parsed))
+        {
+            var expected = GetTestGUID();
+            Test.Assert(parsed == expected);
+        }
+        else
+        {
+            Test.Assert(false); // Parse should have succeeded
+        }
+    }
+
+    [Test]
+    public static void Parse_BFormat()
+    {
+        String testStr = "{550e8400-e29b-41d4-a716-446655440000}";
+        
+        if (Guid.Parse(testStr) case .Ok(let parsed))
+        {
+            var expected = GetTestGUID();
+            Test.Assert(parsed == expected);
+        }
+        else
+        {
+            Test.Assert(false); // Parse should have succeeded
+        }
+    }
+
+    [Test]
+    public static void Parse_PFormat()
+    {
+        String testStr = "(550e8400-e29b-41d4-a716-446655440000)";
+        
+        if (Guid.Parse(testStr) case .Ok(let parsed))
+        {
+            var expected = GetTestGUID();
+            Test.Assert(parsed == expected);
+        }
+        else
+        {
+            Test.Assert(false); // Parse should have succeeded
+        }
+    }
+
+    [Test]
+    public static void Parse_XFormat()
+    {
+		//return GUID(0x550e8400, 0xe29b, 0x41d4, 0xa7, 0x16, 0x44, 0x66, 0x55, 0x44, 0x00, 0x00);
+        String testStr = "{0x550e8400,0xe29b,0x41d4,{0xa7,0x16,0x44,0x66,0x55,0x44,0x00,0x00}}";
+        
+        if (Guid.Parse(testStr) case .Ok(let parsed))
+        {
+            var expected = GetTestGUID();
+            Test.Assert(parsed == expected);
+        }
+        else
+        {
+            Test.Assert(false); // Parse should have succeeded
+        }
+    }
+
+    [Test]
+    public static void Parse_EmptyString()
+    {
+        if (Guid.Parse("") case .Ok(let parsed))
+        {
+            Test.Assert(false); // Should have failed
+        }
+        else
+        {
+            // Expected to fail
+            Test.Assert(true);
+        }
+    }
+
+    [Test]
+    public static void Parse_InvalidFormat()
+    {
+        String[] invalidStrings = scope .(
+            "invalid",
+            "123",
+            "550e8400-e29b-41d4-a716", // Too short
+            "550e8400-e29b-41d4-a716-446655440000-extra", // Too long
+            "{550e8400-e29b-41d4-a716-446655440000", // Missing closing brace
+            "550e8400-e29b-41d4-a716-446655440000}", // Missing opening brace
+            "(550e8400-e29b-41d4-a716-446655440000", // Missing closing paren
+            "550e8400-e29b-41d4-a716-446655440000)", // Missing opening paren
+            "gggggggg-gggg-gggg-gggg-gggggggggggg", // Invalid hex characters
+            "550e8400e29b41d4a716446655440000extra", // N format too long
+            "550e8400e29b41d4a71644665544000", // N format too short
+        );
+
+        for (var invalidStr in invalidStrings)
+        {
+            if (Guid.Parse(invalidStr) case .Ok(let parsed))
+            {
+                Test.Assert(false); // Should have failed
+            }
+        }
+    }
+
+    [Test]
+    public static void Parse_WithWhitespace()
+    {
+        String testStr = "  550e8400-e29b-41d4-a716-446655440000  ";
+        
+        if (Guid.Parse(testStr) case .Ok(let parsed))
+        {
+            var expected = GetTestGUID();
+            Test.Assert(parsed == expected);
+        }
+        else
+        {
+            Test.Assert(false); // Parse should have succeeded
+        }
+    }
+
+    [Test]
+    public static void RoundTripTest_AllFormats()
+    {
+        var original = GetTestGUID();
+        String str = scope String();
+        
+        // Test each format can round-trip
+        char8[] formats = scope .('N', 'D', 'B', 'P', 'X');
+        
+        for (var format in formats)
+        {
+            str.Clear();
+            original.ToString(str, format);
+            
+            if (Guid.Parse(str) case .Ok(let parsed))
+            {
+                Test.Assert(parsed == original);
+            }
+            else
+            {
+                Test.Assert(false); // Round-trip should work
+            }
+        }
+    }
+
+    [Test]
+    public static void RoundTripTest_RandomGUIDs()
+    {
+        // Test with multiple different GUIDs
+        Guid[] testGuids = scope .(
+            Guid.Empty,
+            GetTestGUID(),
+            Guid(0xFFFFFFFF, 0xFFFF, 0xFFFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF),
+            Guid(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01),
+            Guid(0x12345678, 0x9ABC, 0xDEF0, 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0)
+        );
+
+        String str = scope String();
+        
+        for (var guid in testGuids)
+        {
+            str.Clear();
+            guid.ToString(str, 'D');
+            
+            if (Guid.Parse(str) case .Ok(let parsed))
+            {
+                Test.Assert(parsed == guid);
+            }
+            else
+            {
+                Test.Assert(false);
+            }
+        }
+    }
+
+    [Test]
+    public static void Create_GeneratesUniqueGUIDs()
+    {
+        // Generate several GUIDs and ensure they're different
+        Guid[] guids = scope Guid[10];
+        
+        for (int i = 0; i < 10; i++)
+        {
+            guids[i] = Guid.Create();
+        }
+        
+        // Check that all GUIDs are different from each other
+        for (int i = 0; i < 10; i++)
+        {
+            for (int j = i + 1; j < 10; j++)
+            {
+                Test.Assert(!(guids[i] == guids[j]));
+            }
+        }
+        
+        // Check that none are empty
+        for (int i = 0; i < 10; i++)
+        {
+            Test.Assert(!(guids[i] == Guid.Empty));
+        }
+    }
+
+    [Test]
+    public static void Parse_CaseInsensitive()
+    {
+        // Test that parsing is case insensitive for hex digits
+        String lowerCase = "550e8400-e29b-41d4-a716-446655440000";
+        String upperCase = "550E8400-E29B-41D4-A716-446655440000";
+        String mixedCase = "550e8400-E29B-41d4-A716-446655440000";
+        
+        var expected = GetTestGUID();
+        
+        if (Guid.Parse(lowerCase) case .Ok(let parsed1))
+        {
+            Test.Assert(parsed1 == expected);
+        }
+        else
+        {
+            Test.Assert(false);
+        }
+        
+        if (Guid.Parse(upperCase) case .Ok(let parsed2))
+        {
+            Test.Assert(parsed2 == expected);
+        }
+        else
+        {
+            Test.Assert(false);
+        }
+        
+        if (Guid.Parse(mixedCase) case .Ok(let parsed3))
+        {
+            Test.Assert(parsed3 == expected);
+        }
+        else
+        {
+            Test.Assert(false);
+        }
+    }
+
+    [Test]
+    public static void ToString_ConsistentOutput()
+    {
+        var guid = GetTestGUID();
+        String str1 = scope String();
+        String str2 = scope String();
+        
+        // Multiple calls should produce identical output
+        guid.ToString(str1, 'D');
+        guid.ToString(str2, 'D');
+        
+        Test.Assert(str1 == str2);
+    }
 }
+#endif