Problem with conditional #include

Using Arduino Programming Questions
27

test.ino:

#define __TESTING
#include <test.h>

void setup() {

    Serial.begin(9600);

    test();

#ifdef __TESTING 
test1();
#else
test2();
#endif
}

void loop() {}

test.h:

#ifndef test_h
#define test_h
#include "Arduino.h"

void test();


#ifdef __TESTING
#warning __TESTING defined in test.h
void test1();
#else
#warning __TESTING UNdefined in test.h
void test2();
#endif
#endif

test.cpp:

#include "Arduino.h"
#include "test.h"

#ifdef __TESTING
#warning __TESTING defined in test.cpp
#else
#warning __TESTING UNdefined in test.cpp
#endif

#ifdef __TESTING
void test(){
    Serial.println("test 1");
}

void test1(){
    Serial.println("test 1::test1()");
}
#else
void test(){
    Serial.println("test 2");
}

void test2(){
    Serial.println("test 2::test2()");
}
#endif

When __TESTING is defined
#define __TESTING

I see the following verbose output:

warning: #warning __TESTING defined in test.h
warning: #warning __TESTING UNdefined in test.h
warning: #warning __TESTING UNdefined in test.cpp

If __TESTING is undefined,
//#define __TESTING

I see the following verbose output:

warning: #warning __TESTING UNdefined in test.h