DI Example

DependencyInjectionExample/DependencyExample.MemoryFileManager/DependencyExample.MockFileManager.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DependencyExample.Core\DependencyExample.Core.csproj" />
+  </ItemGroup>
+
+</Project>

DependencyInjectionExample/DependencyExample.MemoryFileManager/MockFileManager.cs

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+using System;
+
+namespace DependencyExample
+{
+    public class MockFileManager : IFileManager
+    {
+        private string mData;
+
+        public bool FailOnPurpose { get; set; }
+
+        public string GetFileData(string path)
+        {
+            return mData;
+        }
+
+        public void WriteFileData(string path, string data)
+        {
+            DependencyProvider.Logger.LogMessage($"Mocking `{data}` to `{path}`, appending ` mock` to the end");
+
+            if (FailOnPurpose)
+                mData = $"{data} mock";
+            else
+                mData = data;
+        }
+    }
+}