C#: Add an integration test for setting the dependency directory in BMN.

Author: michaelnebel

csharp/ql/integration-tests/all-platforms/standalone_dependency_dir/Assemblies.expected

@@ -0,0 +1 @@
+| dependencies/packages/newtonsoft.json/13.0.1/lib/netstandard2.0/Newtonsoft.Json.dll:0:0:0:0 | Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed |

csharp/ql/integration-tests/all-platforms/standalone_dependency_dir/Assemblies.ql

@@ -0,0 +1,7 @@
+import csharp
+
+from Assembly a
+where
+  not a.getCompilation().getOutputAssembly() = a and
+  a.getName().matches("%Newtonsoft%")
+select a

csharp/ql/integration-tests/all-platforms/standalone_dependency_dir/proj/Program.cs

@@ -0,0 +1,6 @@
+class Program
+{
+    static void Main(string[] args)
+    {
+    }
+}

csharp/ql/integration-tests/all-platforms/standalone_dependency_dir/proj/global.json

@@ -0,0 +1,5 @@
+{
+  "sdk": {
+    "version": "9.0.304"
+  }
+}

csharp/ql/integration-tests/all-platforms/standalone_dependency_dir/proj/standalone.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net9.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <Target Name="DeleteBinObjFolders" BeforeTargets="Clean">
+    <RemoveDir Directories=".\bin" />
+    <RemoveDir Directories=".\obj" />
+  </Target>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+</Project>

csharp/ql/integration-tests/all-platforms/standalone_dependency_dir/test.py

@@ -0,0 +1,8 @@
+import os
+
+def test(codeql, csharp, cwd):
+    path = os.path.join(cwd, "dependencies")
+    os.environ["CODEQL_EXTRACTOR_CSHARP_OPTION_BUILDLESS_DEPENDENCY_DIR"] = path
+    # The Assemblies.ql query shows that the Newtonsoft assembly is found in the
+    # dependency directory set above.
+    codeql.database.create(source_root="proj", build_mode="none")