test: add a test checking that when packing a library we include the …

…source files and project file

tests/Main.fs

@@ -221,3 +221,22 @@ let ``should support multiple fable targets`` () =
             Is.EqualTo("fable-rust;fable-javascript;fable-python;fable;fable-library")
         )
     }
+
+[<Test>]
+let ``should include the source file and the project file under 'fable' folder`` () =
+    task {
+        let! stdout, _ =
+            Command.ReadAsync(
+                "dotnet",
+                $"msbuild %s{Workspace.fixtures.valid.``library-with-files``.``MyLibrary.fsproj``} --getItem:Content"
+            )
+
+        Assert.That(
+            stdout.Trim(),
+            Contains.Substring("tests/fixtures/valid/library-with-files/Entry.fs")
+        )
+        Assert.That(
+            stdout.Trim(),
+            Contains.Substring("tests/fixtures/valid/library-with-files/MyLibrary.fsproj")
+        )
+    }

tests/fixtures/valid/library-with-files/Entry.fs

@@ -0,0 +1,3 @@
+module MyLibrary
+
+let answer = 42

tests/fixtures/valid/library-with-files/MyLibrary.fsproj

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFramework>netstandard2.0</TargetFramework>
+        <FablePackageType>library</FablePackageType>
+    </PropertyGroup>
+    <ItemGroup>
+        <Compile Include="Entry.fs" />
+    </ItemGroup>
+    <Import Project="./../../Fable.Package.SDK.Imports.props" />
+</Project>