How to create an automation test for a workflow

I am working on a workflow project that has 19 scenarios for testing the whole system and 34 steps.

So, my question is, how can I create an automation test for it?

My current approach is: Create an integrated test per each scenario, and then create the main system test to run all integrated tests.

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

namespace Project1
{
     // Unit tests
    public class UnitTest_step1
    {
        public void RunTest() { }
    }

    public class UnitTest_step2
    {
        public void RunTest() { }
    }

    public class UnitTest_step3
    {
        public void RunTest() { }
    }

    public class UnitTest_step4
    {
        public void RunTest() { }
    }
     // End of unit tests

    public class IntegrationTests
    {

        public void IntegrationTest1()
        {
            UnitTest_step1.RunTest();
            UnitTest_step2.RunTest();
            UnitTest_step4.RunTest();
        }

        public void IntegrationTest2()
        {
            UnitTest_step1.RunTest();
            UnitTest_step2.RunTest();
            UnitTest_step3.RunTest();
            UnitTest_step4.RunTest();
        }

        public void IntegrationTest3()
        {
            UnitTest_step1.RunTest();
            UnitTest_step4.RunTest();
        }

    }



    [TestClass]
    public class SystemTests
    {
        [TestMethod]
        public void Scenario1()
        {
            IntegrationTests.IntegrationTest1()
        }

        [TestMethod]
        public void Scenario2()
        {
            IntegrationTests.IntegrationTest2();
        }

        [TestMethod]
        public void Scenario3()
        {
            IntegrationTests.IntegrationTest3();
        }

        [TestMethod]
        public void ScenarioN()
        {
            IntegrationTests.IntegrationTestN();
        }
    }
}

Best Regards.