refactor: improve mocking tests in FileSystemTests

Author: vbreuss

Directory.Packages.props

@@ -22,13 +22,14 @@
     <PackageVersion Include="coverlet.collector" Version="8.0.1" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="3.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
-    <PackageVersion Include="Mockolate" Version="2.0.2" />
+    <PackageVersion Include="Mockolate" Version="2.4.0" />
     <PackageVersion Include="NUnit" Version="4.5.1" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.12.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.4"/>
     <PackageVersion Include="aweXpect" Version="2.31.0"/>
     <PackageVersion Include="aweXpect.Testably" Version="0.13.0"/>
+    <PackageVersion Include="aweXpect.Mockolate" Version="2.3.0"/>
   </ItemGroup>
   <ItemGroup>
     <PackageVersion Include="Nuke.Common" Version="10.1.0"/>

tests/Directory.Build.props

@@ -27,6 +27,7 @@
         <PackageReference Include="NUnit3TestAdapter" />
         <PackageReference Include="aweXpect"/>
         <PackageReference Include="aweXpect.Testably"/>
+        <PackageReference Include="aweXpect.Mockolate"/>
     </ItemGroup>
 
     <PropertyGroup>

tests/TestableIO.System.IO.Abstractions.Wrappers.Tests/FileSystemTests.cs

@@ -26,12 +26,14 @@ await That(memoryStream).HasLength().GreaterThan(0)
     [Test]
     public async Task Mock_File_Succeeds()
     {
-        var fileSystemMock = IFileSystem.CreateMock(fs =>
+        var fileSystem = IFileSystem.CreateMock(fs =>
             fs.File.InitializeWith(IFile.CreateMock()));
-
-        await That(() =>
-            fileSystemMock.File.Mock.Setup.ReadAllText(It.IsAny<string>()).Returns("")
-        ).DoesNotThrow();
+        fileSystem.File.Mock.Setup.ReadAllText(It.IsAny<string>()).Returns("foo");
+        
+        var result = fileSystem.File.ReadAllText("any path");
+        
+        await That(result).IsEqualTo("foo");
+        await That(fileSystem.File.Mock.Verify.ReadAllText(It.Is("any path"))).Once();
     }
 
     [Test]