Index: tests/OFDictionary/OFDictionary.m
==================================================================
--- tests/OFDictionary/OFDictionary.m
+++ tests/OFDictionary/OFDictionary.m
@@ -9,11 +9,12 @@
  * the packaging of this file.
  */
 
 #import "config.h"
 
-#import <stdio.h>
+#include <stdio.h>
+#include <string.h>
 
 #import "OFAutoreleasePool.h"
 #import "OFDictionary.h"
 #import "OFConstString.h"
 #import "OFString.h"
@@ -33,10 +34,18 @@
 	       to: value1];
 	[dict set: key2
 	       to: value2];
 	[pool release];
 
-	puts([[dict get: @"key1"] cString]);
-	puts([[dict get: key2] cString]);
+	if (strcmp([[dict get: @"key1"] cString], "value1")) {
+		puts("\033[K\033[1;31mTest 1/2 failed!\033[m");
+		return 1;
+	}
+
+	if (strcmp([[dict get: key2] cString], "value2")) {
+		puts("\033[K\033[1;31mTest 2/2 failed!\033[m");
+		return 1;
+	}
 
+	puts("\033[1;32mTests successful: 2/2\033[0m");
 	return 0;
 }

Index: tests/OFPlugin/OFPlugin.m
==================================================================
--- tests/OFPlugin/OFPlugin.m
+++ tests/OFPlugin/OFPlugin.m
@@ -8,10 +8,12 @@
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
 
 #import "config.h"
+
+#include <stdio.h>
 
 #import "OFPlugin.h"
 #import "TestPlugin/TestPlugin.h"
 
 int
@@ -18,9 +20,13 @@
 main()
 {
 	TestPlugin *plugin;
 
 	plugin = [OFPlugin pluginFromFile: "TestPlugin/TestPlugin"];
-	[plugin test];
+	if ([plugin test: 1234] != 2468) {
+		puts("\033[K\033[1;31mTest 1/1 failed!\033[m");
+		return 1;
+	}
 
+	puts("\033[1;32mTests successful: 1/1\033[0m");
 	return 0;
 }

Index: tests/OFPlugin/TestPlugin/TestPlugin.h
==================================================================
--- tests/OFPlugin/TestPlugin/TestPlugin.h
+++ tests/OFPlugin/TestPlugin/TestPlugin.h
@@ -10,7 +10,7 @@
  */
 
 #import "OFPlugin.h"
 
 @interface TestPlugin: OFPlugin
-- (void)test;
+- (int)test: (int)num;
 @end

Index: tests/OFPlugin/TestPlugin/TestPlugin.m
==================================================================
--- tests/OFPlugin/TestPlugin/TestPlugin.m
+++ tests/OFPlugin/TestPlugin/TestPlugin.m
@@ -7,21 +7,19 @@
  * This file is part of libobjfw. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
 
-#include <stdio.h>
-
 #import "TestPlugin.h"
 
 @implementation TestPlugin
-- (void)test
+- (int)test: (int)num
 {
-	puts("Test successfull!");
+	return num * 2;
 }
 @end
 
 id
 init_plugin()
 {
 	return [TestPlugin new];
 }