2 important setups of Auto Fixture to generate Fake Object.

      1)    Setup formatted data in time of object creation.

Let’s assume one scenario where we need to setup formatted data in time of using Auto Fixture. For example, we have Age property of integer type in class and we want to specify some range value to be generated in time of object creation using Auto Fixture.

The good news is, Auto Fixture supports attribute to generate automated value. We can decorate our POCO class like following.

public class Person

   {

       [Range(18,100)]

       public int Age { get; set; }

       [StringLength(10)]

       public string Name { get; set; }

       public DateTime RegDate { get; set; }

   }

Here is the code to create object using Auto Fixture.

[TestMethod]

        public void Test_Function()

        {

            var fixture = new Fixture();

            var person = fixture.Create<Person>();

        }

And we are seeing that the value has created based on attribute specified in POCO class.

      2) Ignore any property from being populated

This is another important setup you might need in time of object creation. Let’s assume one scenario where you want not to populate any property in time of object creation or you want to set some default value to some property.

Let’s have a look in below example. We are using same POCO class

public class Person

   {

       [Range(18,100)]

       public int Age { get; set; }

       [StringLength(10)]

       public string Name { get; set; }

       public DateTime RegDate { get; set; }

   }

Now, we don’t want to set “Age” property in time of object creation and the RegDate should to today’s date. To implement same we can setup fixture like this.

        [TestMethod]

        public void Test_Function()

        {

            var fixture = new Fixture();

            var person = fixture.Build<Person>().

                          Without(f=>f.Age).

                          Do(f=>f.RegDate = DateTime.Now).CreateAnonymous();

        }