@@ -21,10 +21,11 @@
 #import "OFArray.h"
 #import "OFNumber.h"
 #import "OFAutoreleasePool.h"
 
 #import "OFEnumerationMutationException.h"
+#import "OFUndefinedKeyException.h"
 
 #import "TestsAppDelegate.h"
 
 static OFString *module = @"OFDictionary";
 static OFString *keys[] = {
@@ -57,10 +58,14 @@
 
 	TEST(@"-[valueForKey:]",
 	    [[dict valueForKey: keys[0]] isEqual: values[0]] &&
 	    [[dict valueForKey: @"@count"] isEqual:
 	    [OFNumber numberWithSize: 2]])
+
+	EXPECT_EXCEPTION(@"Catching -[setValue:forKey:] on immutable "
+	    @"dictionary", OFUndefinedKeyException, [dict setValue: @"x"
+							    forKey: @"x"])
 
 	TEST(@"-[containsObject:]",
 	    [dict containsObject: values[0]] &&
 	    ![dict containsObject: @"nonexistant"])