Index: tests/Makefile
==================================================================
--- tests/Makefile
+++ tests/Makefile
@@ -40,10 +40,11 @@
        OFLHAArchiveTests.m			\
        OFListTests.m				\
        OFLocaleTests.m				\
        OFMatrix4x4Tests.m			\
        OFMemoryStreamTests.m			\
+       OFMessagePackTests.m			\
        OFMethodSignatureTests.m			\
        OFMutableArrayTests.m			\
        OFMutableDataTests.m			\
        OFMutableDictionaryTests.m		\
        OFMutableSetTests.m			\

ADDED   tests/OFMessagePackTests.m
Index: tests/OFMessagePackTests.m
==================================================================
--- /dev/null
+++ tests/OFMessagePackTests.m
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
+ *
+ * All rights reserved.
+ *
+ * This file is part of ObjFW. It may be distributed under the terms of the
+ * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
+ * the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
+ * file.
+ */
+
+#include "config.h"
+
+#import "ObjFW.h"
+#import "ObjFWTest.h"
+
+@interface OFMessagePackTests: OTTestCase
+@end
+
+@implementation OFMessagePackTests
+- (void)testMessagePackRepresentationForNumber
+{
+	OTAssertEqualObjects([[OFNumber numberWithChar: -30]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xE2" count: 1]);
+
+	OTAssertEqualObjects([[OFNumber numberWithChar: -33]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xD0\xDF" count: 2]);
+
+	OTAssertEqualObjects([[OFNumber numberWithUnsignedChar: 127]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\x7F" count: 1]);
+
+	OTAssertEqualObjects([[OFNumber numberWithUnsignedChar: 128]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xCC\x80" count: 2]);
+
+	OTAssertEqualObjects([[OFNumber numberWithShort: -129]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xD1\xFF\x7F" count: 3]);
+
+	OTAssertEqualObjects([[OFNumber numberWithUnsignedShort: 256]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xCD\x01\x00" count: 3]);
+
+	OTAssertEqualObjects([[OFNumber numberWithLong: -32769]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xD2\xFF\xFF\x7F\xFF" count: 5]);
+
+	OTAssertEqualObjects([[OFNumber numberWithUnsignedLong: 65536]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xCE\x00\x01\x00\x00" count: 5]);
+
+	OTAssertEqualObjects([[OFNumber numberWithLongLong: -2147483649]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xD3\xFF\xFF\xFF\xFF\x7F\xFF\xFF\xFF"
+			    count: 9]);
+
+	OTAssertEqualObjects([[OFNumber numberWithUnsignedLongLong: 4294967296]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xCF\x00\x00\x00\x01\x00\x00\x00\x00"
+			    count: 9]);
+
+	OTAssertEqualObjects([[OFNumber numberWithFloat: 1.25f]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xCA\x3F\xA0\x00\x00" count: 5]);
+
+	OTAssertEqualObjects([[OFNumber numberWithDouble: 1.25]
+	    messagePackRepresentation],
+	    [OFData dataWithItems: "\xCB\x3F\xF4\x00\x00\x00\x00\x00\x00"
+			    count: 9]);
+}
+
+- (void)testObjectByParsingMessagePackForNumber
+{
+	OTAssertEqualObjects([[OFData dataWithItems: "\xE2" count: 1]
+	    objectByParsingMessagePack],
+	    [OFNumber numberWithChar: -30]);
+
+	OTAssertEqualObjects([[OFData dataWithItems: "\xD0\xDF" count: 2]
+	    objectByParsingMessagePack],
+	    [OFNumber numberWithChar: -33]);
+
+	OTAssertEqualObjects([[OFData dataWithItems: "\x7F" count: 1]
+	    objectByParsingMessagePack],
+	    [OFNumber numberWithUnsignedChar: 127]);
+
+	OTAssertEqualObjects([[OFData dataWithItems: "\xCC\x80" count: 2]
+	    objectByParsingMessagePack],
+	    [OFNumber numberWithUnsignedChar: 128]);
+
+	OTAssertEqualObjects([[OFData dataWithItems: "\xD1\xFF\x7F" count: 3]
+	    objectByParsingMessagePack],
+	    [OFNumber numberWithShort: -129]);
+
+	OTAssertEqualObjects([[OFData dataWithItems: "\xCD\x01\x00" count: 3]
+	    objectByParsingMessagePack],
+	    [OFNumber numberWithUnsignedShort: 256]);
+
+	OTAssertEqualObjects(
+	    [[OFData dataWithItems: "\xD2\xFF\xFF\x7F\xFF"
+			     count: 5] objectByParsingMessagePack],
+	    [OFNumber numberWithLong: -32769]);
+
+	OTAssertEqualObjects(
+	    [[OFData dataWithItems: "\xCE\x00\x01\x00\x00"
+			     count: 5] objectByParsingMessagePack],
+	    [OFNumber numberWithUnsignedLong: 65536]);
+
+	OTAssertEqualObjects(
+	    [[OFData dataWithItems: "\xD3\xFF\xFF\xFF\xFF\x7F\xFF\xFF\xFF"
+			     count: 9] objectByParsingMessagePack],
+	    [OFNumber numberWithLongLong: -2147483649]);
+
+	OTAssertEqualObjects(
+	    [[OFData dataWithItems: "\xCF\x00\x00\x00\x01\x00\x00\x00\x00"
+			     count: 9] objectByParsingMessagePack],
+	    [OFNumber numberWithUnsignedLongLong: 4294967296]);
+
+	OTAssertEqualObjects(
+	    [[OFData dataWithItems: "\xCA\x3F\xA0\x00\x00"
+			     count: 5] objectByParsingMessagePack],
+	    [OFNumber numberWithFloat: 1.25f]);
+
+	OTAssertEqualObjects(
+	    [[OFData dataWithItems: "\xCB\x3F\xF4\x00\x00\x00\x00\x00\x00"
+			     count: 9] objectByParsingMessagePack],
+	    [OFNumber numberWithDouble: 1.25]);
+}
+@end