How to use ThrowTheSwitch's Unity C unit testing library?

How to use ThrowTheSwitch's Unity C unit testing library?

I'm trying to use ThrowTheSwitch's Unity library to create my unit test in C, but I got some strange errors, but I'm newbie, so this is maybe something basic.

Here is My code:this is mytest.c

int testValue = 45;int testThisPass(int idx){    if idx == 42        return 1;    return 0;}int testThisNotPass(int idx){    return 42;} 

this is mytest.h

int testThisPass(int idx);int testThisNotPass(int idx);

this is mytestMain.c

#include "unity.h"#include "unity_internals.h"#include "mytest.h"#include <stdio.h>void setUp(void) {    //testValue = 40;}void tearDown(void) {    // clean stuff up here}void test_function_should_doBlahAndBlah(void) {    TEST_ASSERT_EQUAL(1,testThisPass(42));}void test_function_should_doAlsoDoBlah(void) {    TEST_ASSERT_EQUAL(42, testThisNotPass(5));}// not needed when using generate_test_runner.rbint main(void) {    UNITY_BEGIN();    RUN_TEST(test_function_should_doBlahAndBlah);    RUN_TEST(test_function_should_doAlsoDoBlah);    return UNITY_END();}

And this is the error what I got when I tried to compile mytestMain.c:

/usr/bin/ld: /tmp/ccOOjz1w.o: in function `test_function_should_doBlahAndBlah':mytestMain.c:(.text+0x24): undefined reference to `testThisPass'/usr/bin/ld: mytestMain.c:(.text+0x43): undefined reference to `UnityAssertEqualNumber'/usr/bin/ld: /tmp/ccOOjz1w.o: in function `test_function_should_doAlsoDoBlah':mytestMain.c:(.text+0x58): undefined reference to `testThisNotPass'/usr/bin/ld: mytestMain.c:(.text+0x77): undefined reference to `UnityAssertEqualNumber'/usr/bin/ld: /tmp/ccOOjz1w.o: in function `main':mytestMain.c:(.text+0x8e): undefined reference to `UnityBegin'/usr/bin/ld: mytestMain.c:(.text+0xa6): undefined reference to `UnityDefaultTestRun'/usr/bin/ld: mytestMain.c:(.text+0xbe): undefined reference to `UnityDefaultTestRun'/usr/bin/ld: mytestMain.c:(.text+0xc3): undefined reference to `UnityEnd'collect2: error: ld returned 1 exit status

What Should I do to work? What did I missed here?