Add constant string test.

Test/CMakeLists.txt

@@ -12,6 +12,7 @@ set(TESTS
 	AssociatedObject2.m
 	BlockImpTest.m
 	BlockTest_arc.m
+	ConstantString.m
 	BoxedForeignException.m
 	ExceptionTest.m
 	ForeignException.m

Test/ConstantString.m

@@ -0,0 +1,30 @@
+#import "Test.h"
+#include <string.h>
+
+@interface NSConstantString : Test
+{
+	const char * const str;
+	const unsigned int len;
+}
+- (unsigned int)length;
+- (const char*)cString;
+@end
+
+@implementation NSConstantString
+- (unsigned int)length
+{
+	return len;
+}
+- (const char*)cString
+{
+	return str;
+}
+@end
+
+
+int main(void)
+{
+	assert([@"1234567890" length] == 10);
+	assert(strcmp([@"123456789" cString], "123456789") == 0);
+	return 0;
+}