Reference Verify test helper

Author: nulltoken

test/.gitignore

@@ -0,0 +1 @@
+*.received.*

test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFrameworks>net462;net50</TargetFrameworks>
+        <TargetFrameworks>net48;net50</TargetFrameworks>
         <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
         <Authors></Authors>
         <Company>Microsoft</Company>

test/Microsoft.OpenApi.SmokeTests/Microsoft.OpenApi.SmokeTests.csproj

@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net462</TargetFrameworks>
+    <TargetFrameworks>net48</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <DefineConstants>TRACE;DEBUG;net462</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;NET48</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>

test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net462;net50</TargetFrameworks>
+    <TargetFrameworks>net48;net50</TargetFrameworks>
     <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
     <Authors></Authors>
     <Company>Microsoft</Company>
@@ -19,6 +19,8 @@
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="SharpYaml" Version="1.8.0" />
+    <PackageReference Include="Verify" Version="13.3.1" />
+    <PackageReference Include="Verify.Xunit" Version="13.3.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <PrivateAssets>all</PrivateAssets>