Put interface behind database provider for testing. Use state object to get data from database, then map to model.

Website.Tests/Data/MySQLDatabaseProviderTests.cs

@@ -0,0 +1,32 @@
+using Website.Data;
+using Xunit;
+using FluentAssertions;
+using MySql.Data.MySqlClient;
+using NSubstitute;
+using Microsoft.Extensions.Configuration;
+
+namespace Website.Tests.Data
+{
+	public class MySQLDatabaseProviderTests
+	{
+		const string ConnectionString = "Server=host;User ID=username;Password=password;Database=database";
+
+		[Fact]
+		public void NewConnection_WithStringConstructor_ReturnsMySQLConnection() {
+			var provider = new MySQLDatabaseProvider(ConnectionString);
+			var connection = provider.NewConnection();
+			connection.Should().BeOfType<MySqlConnection>();
+			(connection as MySqlConnection).ConnectionString.Should().Be(ConnectionString);
+		}
+
+		[Fact]
+		public void NewConnection_WithConfigConstructor_ReturnsMySQLConnection() {
+			var config = Substitute.For<IConfiguration>();
+			config.GetConnectionString("database").Returns(ConnectionString);
+			var provider = new MySQLDatabaseProvider(ConnectionString);
+			var connection = provider.NewConnection();
+			connection.Should().BeOfType<MySqlConnection>();
+			(connection as MySqlConnection).ConnectionString.Should().Be(ConnectionString);
+		}
+	}
+}

Website.Tests/Website.Tests.csproj

@@ -12,7 +12,9 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="fluentassertions" Version="5.6.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
+    <PackageReference Include="mysqlconnector" Version="0.52.0" />
     <PackageReference Include="nsubstitute" Version="4.0.0" />
     <PackageReference Include="xunit" Version="2.4.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />

Website/Data/BlogRepository.cs

@@ -2,21 +2,22 @@ using System.Threading.Tasks;
 using System.Linq;
 using Dapper;
 using Website.Models;
+using Website.Data.States;
 
 namespace Website.Data
 {
 	public class BlogRepository
 	{
-		private readonly DatabaseProvider _dbProvider;
+		private readonly IDatabaseProvider _dbProvider;
 
-		public BlogRepository(DatabaseProvider dbProvider) => _dbProvider = dbProvider;
+		public BlogRepository(IDatabaseProvider dbProvider) => _dbProvider = dbProvider;
 
 		public async Task<BlogPost> GetPostAsync(int id) {
-			const string query = "SELECT * FROM blog_posts WHERE post_id=@id";
+			const string query = "SELECT * FROM blog_posts WHERE post_id=@id AND post_deleted=0";
 			using (var connection = _dbProvider.NewConnection()) {
 				connection.Open();
-				var result = await connection.QueryAsync<BlogPost>(query, new{id});
+				var result = await connection.QueryAsync<BlogPostState>(query, new{id});
-				return result.FirstOrDefault();
+				return new BlogPost(result.First());
 			}
 		}
 	}

Website/Data/DatabaseProvider.cs

@@ -1,17 +0,0 @@
-using System.Data;
-using Microsoft.Extensions.Configuration;
-using MySql.Data.MySqlClient;
-
-namespace Website.Data
-{
-	public class DatabaseProvider
-	{
-		private readonly string _connectionString;
-
-		public DatabaseProvider(IConfiguration config) => _connectionString = config.GetConnectionString("database");
-
-		public DatabaseProvider(string connectionString) => _connectionString = connectionString;
-
-		public IDbConnection NewConnection() => new MySqlConnection(_connectionString);
-	}
-}

Website/Data/IDatabaseProvider.cs

@@ -0,0 +1,9 @@
+using System.Data;
+
+namespace Website.Data
+{
+	public interface IDatabaseProvider
+	{
+		IDbConnection NewConnection();
+	}
+}

Website/Data/MySQLDatabaseProvider.cs

@@ -0,0 +1,17 @@
+using System.Data;
+using Microsoft.Extensions.Configuration;
+using MySql.Data.MySqlClient;
+
+namespace Website.Data
+{
+	public class MySQLDatabaseProvider:IDatabaseProvider
+	{
+		private readonly string _connectionString;
+
+		public MySQLDatabaseProvider(IConfiguration config) => _connectionString = config.GetConnectionString("database");
+
+		public MySQLDatabaseProvider(string connectionString) => _connectionString = connectionString;
+
+		public IDbConnection NewConnection() => new MySqlConnection(_connectionString);
+	}
+}

Website/Data/States/BlogPostState.cs

@@ -0,0 +1,19 @@
+using System;
+using Dapper.Contrib.Extensions;
+
+namespace Website.Data.States
+{
+	[Table("blog_posts")]
+	public class BlogPostState
+	{
+		[Key]
+		public int Post_Id { get; set; }
+		public string Post_Title { get; set; }
+		public string Post_Content { get; set; }
+		public DateTime Post_Timestamp { get; set; }
+		public string Post_Draft { get; set; }
+		public string Post_Url { get; set; }
+		public bool Post_Deleted{ get; set; }
+		public int User_Id { get; set; }
+	}
+}

Website/Models/BlogPost.cs

@@ -1,9 +1,27 @@
+using System;
+using Website.Data.States;
+
 namespace Website.Models
 {
 	public class BlogPost
 	{
-		public int PostId { get; set; }
+		public BlogPost(BlogPostState state)
-		public string PostTitle { get; set; }
+		{
-		public string Post_Title { get; set; }
+			Id = state.Post_Id;
+			Title = state.Post_Title;
+			Content = state.Post_Content;
+			Timestamp = state.Post_Timestamp;
+			Draft = state.Post_Draft;
+			Url = state.Post_Url;
+			UserId = state.User_Id;
+		}
+
+		public int Id { get; set; }
+		public string Title { get; set; }
+		public string Content { get; set; }
+		public DateTime Timestamp { get; set; }
+		public string Draft { get; set; }
+		public string Url { get; set; }
+		public int UserId { get; set; }
 	}
 }

Website/Startup.cs

@@ -39,7 +39,7 @@ namespace Website
 		}
 
 		private void RegisterRepositories(IServiceCollection services) =>
-			services.AddSingleton<DatabaseProvider, DatabaseProvider>()
+			services.AddSingleton<IDatabaseProvider, MySQLDatabaseProvider>()
 			.AddSingleton<BlogRepository, BlogRepository>();
 
 		// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

Website/Views/Blog/View.cshtml

@@ -5,4 +5,4 @@
 	ViewData["Title"] = "Blog";
 }
 
-@Model.PostTitle
+@Model.Title

Website/appsettings.Development.json

@@ -5,5 +5,8 @@
 			"System": "Information",
 			"Microsoft": "Information"
 		}
+	},
+	"ConnectionStrings": {
+		"database": "Server=localhost;User ID=user;Password=pass;Database=db"
 	}
 }