C#: Add test for file scoped namespace.

Author: michaelnebel

csharp/ql/test/library-tests/csharp10/FileScopedNamespace.cs

@@ -0,0 +1,8 @@
+namespace MyFileScopedNamespace;
+public class MyFileScopedNamespaceClass
+{
+    private readonly object myField = new object();
+    public object MyProp { get; set; }
+    public void MyMethod() { }
+
+}

csharp/ql/test/library-tests/csharp10/fileScopedNamespace.expected

@@ -0,0 +1,4 @@
+| FileScopedNamespace.cs:1:11:1:31 | MyFileScopedNamespace | FileScopedNamespace.cs:2:14:2:39 | MyFileScopedNamespaceClass |
+| FileScopedNamespace.cs:1:11:1:31 | MyFileScopedNamespace | FileScopedNamespace.cs:4:29:4:35 | myField |
+| FileScopedNamespace.cs:1:11:1:31 | MyFileScopedNamespace | FileScopedNamespace.cs:5:19:5:24 | MyProp |
+| FileScopedNamespace.cs:1:11:1:31 | MyFileScopedNamespace | FileScopedNamespace.cs:6:17:6:24 | MyMethod |

csharp/ql/test/library-tests/csharp10/fileScopedNamespace.ql

@@ -0,0 +1,10 @@
+import csharp
+
+query predicate fileScopedNamespace(Namespace n, Member m) {
+  n.hasQualifiedName("MyFileScopedNamespace") and
+  exists(Class c |
+    c.getNamespace() = n and
+    c.hasMember(m) and
+    m.getLocation().toString().matches("%FileScopedNamespace.cs%")
+  )
+}