Add tests for NSValueTransformer.

Tests/base/NSValueTransformer/basic.m

@@ -0,0 +1,99 @@
+#import "ObjectTesting.h"
+#import <Foundation/NSAutoreleasePool.h>
+#import <Foundation/NSValueTransformer.h>
+#import <Foundation/NSValue.h>
+
+@interface YesTransformer : NSValueTransformer
+@end
+
+@implementation YesTransformer
+
++ (BOOL) allowsReverseTransformation
+{
+  return NO;
+}
+
++ (Class) transformedValueClass
+{
+  return [NSNumber class];
+}
+
+- (id) transformedValue: (id)value
+{
+  return [NSNumber numberWithBool: YES];
+}
+
+@end
+
+@interface NestedTransformer : NSValueTransformer
+{
+  NSValueTransformer *_backingTransformer;
+}
+@end
+
+@implementation NestedTransformer
+
+- (id) init
+{
+  if (self = [super init]) {
+    _backingTransformer = RETAIN([NSValueTransformer valueTransformerForName:
+      NSStringFromClass([YesTransformer class])]);
+  }
+
+  return self;
+}
+
+- (void) dealloc
+{
+  RELEASE(_backingTransformer);
+  DEALLOC
+}
+
++ (BOOL) allowsReverseTransformation
+{
+  return NO;
+}
+
++ (Class) transformedValueClass
+{
+  return [YesTransformer transformedValueClass];
+}
+
+- (id) transformedValue: (id)value
+{
+  return [_backingTransformer transformedValue: value];
+}
+
+@end
+
+int main()
+{
+  NSAutoreleasePool   *arp = [NSAutoreleasePool new];
+  NSValueTransformer  *transformer;
+  
+  transformer = [NSValueTransformer valueTransformerForName:NSNegateBooleanTransformerName];
+  PASS([[transformer transformedValue:[NSNumber numberWithBool:NO]] boolValue] == YES
+    && [[transformer transformedValue:[NSNumber numberWithBool:YES]] boolValue] == NO,
+    "NSNegateBooleanTransformer transforms correctly");
+  PASS([[transformer reverseTransformedValue:[NSNumber numberWithBool:NO]] boolValue] == YES
+    && [[transformer reverseTransformedValue:[NSNumber numberWithBool:YES]] boolValue] == NO,
+    "NSNegateBooleanTransformer reverse transforms correctly");
+  
+  transformer = [NSValueTransformer valueTransformerForName:NSIsNilTransformerName];
+  PASS([[transformer transformedValue:nil] boolValue] == YES
+    && [[transformer transformedValue:@""] boolValue] == NO,
+    "NSIsNilTransformer transforms correctly");
+  
+  transformer = [NSValueTransformer valueTransformerForName:NSIsNotNilTransformerName];
+  PASS([[transformer transformedValue:@""] boolValue] == YES
+    && [[transformer transformedValue:nil] boolValue] == NO,
+    "NSIsNotNilTransformer transforms correctly");
+  
+  transformer = [NSValueTransformer valueTransformerForName:NSStringFromClass([NestedTransformer class])];
+  PASS([[transformer transformedValue:nil] boolValue] == YES
+    && [[transformer transformedValue:@""] boolValue] == YES,
+    "Custom transformer transforms correctly");
+
+  [arp release]; arp = nil;
+  return 0;
+}