CPP: Add a test of NameQualifiableElement and NameQualifyingElement.

Author: geoffw0

cpp/ql/test/library-tests/namespaces/namespaces/namequalifiable.expected

@@ -0,0 +1,11 @@
+| file://:0:0:0:0 | (global namespace) | NameQualifyingElement |
+| file://:0:0:0:0 | B | NameQualifyingElement |
+| namespaces.cpp:1:11:1:11 | A | NameQualifyingElement |
+| namespaces.cpp:9:11:9:11 | C | NameQualifyingElement |
+| namespaces.cpp:11:13:11:13 | C::D | NameQualifyingElement |
+| namespaces.cpp:13:30:13:30 | 0 | NameQualifiableElement |
+| namespaces.cpp:15:12:15:12 | E | NameQualifyingElement |
+| namespaces.cpp:32:11:32:13 | C:: | NameQualifiableElement |
+| namespaces.cpp:32:11:32:17 | call to f | NameQualifiableElement |
+| namespaces.cpp:32:14:32:16 | D:: | NameQualifiableElement |
+| namespaces.cpp:36:11:36:13 | std | NameQualifyingElement |

cpp/ql/test/library-tests/namespaces/namespaces/namequalifiable.ql

@@ -0,0 +1,15 @@
+import cpp
+
+string describe(Element e) {
+	(
+		e instanceof NameQualifiableElement and
+		result = "NameQualifiableElement"
+	) or (
+		e instanceof NameQualifyingElement and
+		result = "NameQualifyingElement"
+	)
+}
+
+from Element e
+where e.getFile().fromSource() or e instanceof Namespace
+select e, strictconcat(describe(e), ", ")