added unit tests

SmallInjector.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33513.286
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SmallInjector", "src\SmallInjector\SmallInjector.csproj", "{32131173-49C5-4AB5-A949-36FA73D762BF}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SmallInjector.Tests", "src\SmallInjector.Tests\SmallInjector.Tests.csproj", "{8EBD2440-A610-4165-8582-CD79F431BFCB}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{32131173-49C5-4AB5-A949-36FA73D762BF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{32131173-49C5-4AB5-A949-36FA73D762BF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{32131173-49C5-4AB5-A949-36FA73D762BF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{32131173-49C5-4AB5-A949-36FA73D762BF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8EBD2440-A610-4165-8582-CD79F431BFCB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8EBD2440-A610-4165-8582-CD79F431BFCB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8EBD2440-A610-4165-8582-CD79F431BFCB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8EBD2440-A610-4165-8582-CD79F431BFCB}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {E9CBE7A5-3E64-491C-A930-B8845D7DF91E}
+	EndGlobalSection
+EndGlobal

playground/SmallInjectorDemo.sln

@@ -5,13 +5,13 @@ VisualStudioVersion = 17.4.33103.184
 MinimumVisualStudioVersion = 15.0.26124.0
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SmallInjectorDemo", "SmallInjectorDemo\SmallInjectorDemo.csproj", "{620CC001-7DF9-4233-AFC2-187FD9144835}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SmallInjector", "SmallInjector\SmallInjector.csproj", "{8D52C856-A71D-4C50-832B-8679CDD030B4}"
-EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{97F8F459-C4B4-4C40-A4CA-2443A9C245D9}"
 	ProjectSection(SolutionItems) = preProject
 		.csharpierrc = .csharpierrc
 	EndProjectSection
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SmallInjector", "..\src\SmallInjector\SmallInjector.csproj", "{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -34,18 +34,18 @@ Global
 		{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x64.Build.0 = Release|Any CPU
 		{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x86.ActiveCfg = Release|Any CPU
 		{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x86.Build.0 = Release|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Debug|x64.Build.0 = Debug|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Debug|x64.Build.0 = Debug|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Debug|x86.Build.0 = Debug|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Debug|x86.Build.0 = Debug|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Release|Any CPU.Build.0 = Release|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Release|x64.ActiveCfg = Release|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Release|x64.ActiveCfg = Release|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Release|x64.Build.0 = Release|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Release|x64.Build.0 = Release|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Release|x86.ActiveCfg = Release|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Release|x86.ActiveCfg = Release|Any CPU
-		{8D52C856-A71D-4C50-832B-8679CDD030B4}.Release|x86.Build.0 = Release|Any CPU
+		{41F6E1B4-C322-4743-9F9E-8A5C57EBA509}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

playground/SmallInjectorDemo/SmallInjectorDemo.csproj

@@ -8,6 +8,6 @@
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>
-    <ProjectReference Include="..\SmallInjector\SmallInjector.csproj" />
+    <ProjectReference Include="..\..\src\SmallInjector\SmallInjector.csproj" />
   </ItemGroup>
 </Project>

src/SmallInjector.Tests/SmallInjector.Tests.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.3.0" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+  </ItemGroup>
+
+</Project>

src/SmallInjector.Tests/UnitTest1.cs

@@ -0,0 +1,16 @@
+namespace SmallInjector.Tests
+{
+    public class Tests
+    {
+        [SetUp]
+        public void Setup()
+        {
+        }
+
+        [Test]
+        public void Test1()
+        {
+            Assert.Pass();
+        }
+    }
+}

src/SmallInjector.Tests/Usings.cs

@@ -0,0 +1 @@
+global using NUnit.Framework;