Проект модульного тестирования не находит методы расширения ⇐ C#

[Anonymous]

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;

namespace PdbLib
{
public static class AssertExtensions
{
public static void AssertVec3Equal(this Assert assert, Vec3 expected, Vec3 actual, double tolerance, string message = "")
{
Assert.IsTrue(expected.DistanceTo(actual) tolerance, message);
}

public static void AssertVec3Equal2(this Assert assert, Vec3 expected, Vec3 actual, double tolerance, string message = "")
{
if (Math.Abs(expected.X - actual.X) >= tolerance)
{
throw new AssertFailedException($"{message} X-component is incorrect. Expected: {expected.X}, Actual: {actual.X}");
}

if (Math.Abs(expected.Y - actual.Y) >= tolerance)
{
throw new AssertFailedException($"{message} Y-component is incorrect. Expected: {expected.Y}, Actual: {actual.Y}");
}

if (Math.Abs(expected.Z - actual.Z) >= tolerance)
{
throw new AssertFailedException($"{message} Z-component is incorrect. Expected: {expected.Z}, Actual: {actual.Z}");
}
}
}
}

Я сохранил этот класс в проекте модульного тестирования и назвал его unit_test_library.
Затем я добавил unit_test_library как ссылку на реальные проекты модульного тестирования.
Однако эти проекты не находят эти функции как члены класса Assert.
В чем проблема?
Я использую:

• Visual Studio 2017
• .NET Framework 4.7.2

Пример использования:
using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using PdbLib;

namespace PdbLibTests
{
[TestClass]
public class HingeMoversTests
{
[TestMethod]
public void MakePredefinedMove()
{
MakePredefinedMoveN(1);
//MakePredefinedHingeMoveN(7);
//MakePredefinedHingeMoveN(8);
}

private void MakePredefinedMoveN(int hingeMoveSize)
{
int residue_count = 3;

// Setup random generator
Random random = new Random(42);
PdbLib.System model = PdbLib.System.MakeRandom(new int[] { residue_count }, 100.0, random);

// Initialize internal coordinates
double[] r = new double[residue_count];
double[] planar = new double[residue_count];
double[] dihedral = new double[residue_count];
Vec3[] coords = new Vec3[residue_count];

for (int i = 0; i < residue_count; i++)
{
r = 1.0;
planar = (90.0).ToRadian();
dihedral = (180.0).ToRadian();
coords = new Vec3();
}

NeRF.RestoreLinearChain(r, planar, dihedral, ref coords);//(0,0,0), (1,0,0), (1,1,0)

for (int i = 0; i < residue_count; i++)
{
model.Vec3ToCa(i, coords);//(0,0,0), (42949672, 0, 0), (42949672, 42949672, 0)
}

AtomMover mover = new AtomMover(hingeMoveSize, Math.PI / 2.0, Math.PI / 2.0);
MoveProposal mp = new MoveProposal(hingeMoveSize);//(0,0,0)

Vec3 v0Before = model.CaToVec3(0);//0,0,0
Vec3 v1Before = model.CaToVec3(1);//1,0,0
Vec3 lastBefore = model.CaToVec3(hingeMoveSize + 1);//1,1,0

mover.ComputeMove(model, 1, Math.PI / 2, ref mp);//mp = (42949672, 0, -30370005)
mp.Apply(ref model);//model = (0,0,0), (42949672, 0, -30370005), (42949672,42949672,0)

Vec3 v0After = model.CaToVec3(0);//0,0,0
Vec3 v1After = model.CaToVec3(1);//1,0,0
Vec3 lastAfter = model.CaToVec3(hingeMoveSize + 1);//1,1,0

Assert.AssertVec3Equal(v0Before, v0After, 1e-5, "First CA should remain unchanged.");
Assert.AssertVec3Equal(lastBefore, lastAfter, 1e-5, "Last CA should remain unchanged.");

double dihedralMovedDegrees = Vec3Helper.DihedralAngle4(v1Before, v0Before, lastBefore, v1After).ToDegrees();

Assert.AreEqual(90.0, Math.Abs(dihedralMovedDegrees), 0.01, "Dihedral angle should change by 90 degrees.");
}
}
}


Подробнее здесь: https://stackoverflow.com/questions/791 ... on-methods