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public class TestDataGenerator : IEnumerable<object[]>
{
    private readonly List<object[]> _data = new List<object[]>
    {
        new object[] {5, 1, 3, 9},
        new object[] {7, 1, 5, 3}
    };

    public IEnumerator<object[]> GetEnumerator() => _data.GetEnumerator();

    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
}

public class ParameterizedTests
{
    public bool IsOddNumber(int number)
    {
        return number % 2 != 0;
    }

    [Theory]
    [ClassData(typeof(TestDataGenerator))]
    public void AllNumbers_AreOdd_WithClassData(int a, int b, int c, int d)
    {
        Assert.True(IsOddNumber(a));
        Assert.True(IsOddNumber(b));
        Assert.True(IsOddNumber(c));
        Assert.True(IsOddNumber(d));
    }
}

public class ParameterizedTests
{
   public bool IsOddNumber(int number)
   {
       return number % 2 != 0;
   }

  [Theory]
  [InlineData(5, 1, 3, 9)]
  [InlineData(7, 1, 5, 3)]
  public void AllNumbers_AreOdd_WithInlineData(int a, int b, int c, int d)
  {
      Assert.True(IsOddNumber(a));
      Assert.True(IsOddNumber(b));
      Assert.True(IsOddNumber(c));
      Assert.True(IsOddNumber(d));
  }
}

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class TestDataGenerator : IEnumerable<object[]>
{
    public static IEnumerable<object[]> GetNumbersFromDataGenerator()
    {
        yield return new object[] { 5, 1, 3, 9 };
        yield return new object[] { 7, 1, 5, 3 };
    }

    public static IEnumerable<object[]> GetPersonFromDataGenerator()
    {
        yield return new object[]
        {
            new Person {Name = "Tribbiani", Age = 56},
            new Person {Name = "Gotti", Age = 16},
            new Person {Name = "Sopranos", Age = 15},
            new Person {Name = "Corleone", Age = 27}
        };

        yield return new object[]
        {
            new Person {Name = "Mancini", Age = 79},
            new Person {Name = "Vivaldi", Age = 16},
            new Person {Name = "Serpico", Age = 19},
            new Person {Name = "Salieri", Age = 20}
        };
    }
}

public class ParameterizedTests
{
    public bool IsOddNumber(int number)
    {
        return number % 2 != 0;
    }

    public bool IsAboveFourteen(Person person)
    {
        return person.Age > 14;
    }

    public static IEnumerable<object[]> GetNumbers()
    {
        yield return new object[] { 5, 1, 3, 9 };
        yield return new object[] { 7, 1, 5, 3 };
    }

    [Theory]
    [MemberData(nameof(GetNumbers))]
    public void AllNumbers_AreOdd_WithMemberData(int a, int b, int c, int d)
    {
        Assert.True(IsOddNumber(a));
        Assert.True(IsOddNumber(b));
        Assert.True(IsOddNumber(c));
        Assert.True(IsOddNumber(d));
    }

    [Theory]
    [MemberData(nameof(TestDataGenerator.GetNumbersFromDataGenerator), MemberType = typeof(TestDataGenerator))]
    public void AllNumbers_AreOdd_WithMemberData_FromDataGenerator(int a, int b, int c, int d)
    {
        Assert.True(IsOddNumber(a));
        Assert.True(IsOddNumber(b));
        Assert.True(IsOddNumber(c));
        Assert.True(IsOddNumber(d));
    }

    [Theory]
    [MemberData(nameof(TestDataGenerator.GetPersonFromDataGenerator), MemberType = typeof(TestDataGenerator))]
    public void AllPersons_AreAbove14_WithMemberData_FromDataGenerator(Person a, Person b, Person c, Person d)
    {
        Assert.True(IsAboveFourteen(a));
        Assert.True(IsAboveFourteen(b));
        Assert.True(IsAboveFourteen(c));
        Assert.True(IsAboveFourteen(d));
    }
}