Test.cs

using UnityEngine;
using UnityEditor;
using NUnit.Framework;

public class JsonUtilTest {

    [System.Serializable]
    public class user_self{
        public user data;
    }

    [System.Serializable]
    public class user{
        public string id;
        public string username;
        public string full_name;
        public string profile_picture;
        public string bio;
        public string website;

        public count counts;

    }

    [System.Serializable]
    public class count{
        public int media;
        public int follows;
        public int followed_by;
    }

    [Test]
    public void HogeTest(){

        var json2 = @"{
            ""data"": {
                ""id"": ""1574083"",
                ""username"": ""snoopdogg"",
                ""full_name"": ""Snoop Dogg"",
                ""profile_picture"": ""http://distillery.s3.amazonaws.com/profiles/profile_1574083_75sq_1295469061.jpg"",
                ""bio"": ""This is my bio"",
                ""website"": ""http://snoopdogg.com""               
            }
        }";

        var result2 = JsonUtility.FromJson<user_self>(json2);
        Assert.AreEqual(result2.data.counts.followed_by, 0);
        Assert.AreEqual(result2.data.counts.follows, 0);
        Assert.AreEqual(result2.data.counts.media, 0);

    }

    [Test]
    public void EditorTest()
    {
        // https://api.instagram.com/v1/users/self/?access_token=ACCESS-TOKEN
        var json = @"
        {
            ""data"": {
                ""id"": ""1574083"",
                ""username"": ""snoopdogg"",
                ""full_name"": ""Snoop Dogg"",
                ""profile_picture"": ""http://distillery.s3.amazonaws.com/profiles/profile_1574083_75sq_1295469061.jpg"",
                ""bio"": ""This is my bio"",
                ""website"": ""http://snoopdogg.com"",
                ""counts"": {
                    ""media"": 1320,
                    ""follows"": 420,
                    ""followed_by"": 3410
                }
            }
        }";

        var result = JsonUtility.FromJson<user_self>(json);
        Assert.That(Is.Equals(result.data.counts.media, 1320));

    }
}