Unresolved external symbol referenced in function error - c++

Question

I've looked at other people's solutions to this problem and none of them, unfortunately, have solved my issue. I was having this error in my dev project, so I started from scratch, followed this tutorial to the letter, including the file names and locations, and I am still getting
1>unittest1.obj : error LNK2019: unresolved external symbol "public:
static int __cdecl HelloWorld::getTwo(void)"
(?getTwo#HelloWorld##SAHXZ) referenced in function "public: void
__thiscall UnitTest1::UnitTest1::TestMethodGetTwo(void)" (?TestMethodGetTwo#UnitTest1#1#QAEXXZ)
1>unittest1.obj : error
LNK2019: unresolved external symbol "public: int __thiscall
HelloWorld::getN(void)const " (?getN#HelloWorld##QBEHXZ) referenced in
function "public: void __thiscall
UnitTest1::UnitTest1::TestMethodGetN(void)"
(?TestMethodGetN#UnitTest1#1#QAEXXZ)
The code is in the tutorial I linked but I will copy it below. I don't understand what I could be doing wrong at this point - my test project depends on my build project, my definitions for these functions are in the class.
HelloWorld.h
#pragma once
class HelloWorld
{
int n = 10;
public:
static int getTwo();
int getN() const;
};
HelloWorld.cpp
#include "stdafx.h"
#include "HelloWorld.h"
int main()
{
return 0;
}
int HelloWorld::getTwo()
{
return 2;
}
int HelloWorld::getN() const
{
return n;
}
unittest1.cpp (in test project)
#include "stdafx.h"
#include "CppUnitTest.h"
#include "../HelloWorld/HelloWorld.h"
using namespace Microsoft::VisualStudio::CppUnitTestFramework;
namespace UnitTest1
{
TEST_CLASS(UnitTest1)
{
public:
TEST_METHOD(TestMethodGetTwo)
{
Assert::AreEqual(2, HelloWorld::getTwo());
}
TEST_METHOD(TestMethodGetN)
{
HelloWorld hw = HelloWorld();
Assert::AreNotEqual(0, hw.getN());
}
};
}
For some reason the linker can't find my definitions, and I'm out of ideas about why that might be.