C++: Add tests for using aliases

Author: Matthew Gretton-Dann

cpp/ql/test/library-tests/using-aliases/using-alias.cpp

@@ -0,0 +1,10 @@
+
+typedef int type1;
+using using1 = float;
+
+typedef using1 type2;
+using using2 = type1;
+
+template<typename T> struct S { using X = T*; };
+
+using Y = S<int>::X;

cpp/ql/test/library-tests/using-aliases/using-alias.expected

@@ -0,0 +1,9 @@
+| file://:0:0:0:0 | X | NestedTypedefType | file://:0:0:0:0 | int * |
+| file://:0:0:0:0 | X | UsingAliasTypedefType | file://:0:0:0:0 | int * |
+| using-alias.cpp:2:13:2:17 | type1 | CTypedefType | file://:0:0:0:0 | int |
+| using-alias.cpp:3:7:3:12 | using1 | UsingAliasTypedefType | file://:0:0:0:0 | float |
+| using-alias.cpp:5:16:5:20 | type2 | CTypedefType | file://:0:0:0:0 | float |
+| using-alias.cpp:6:7:6:12 | using2 | UsingAliasTypedefType | file://:0:0:0:0 | int |
+| using-alias.cpp:8:39:8:39 | X | NestedTypedefType | file://:0:0:0:0 | T * |
+| using-alias.cpp:8:39:8:39 | X | UsingAliasTypedefType | file://:0:0:0:0 | T * |
+| using-alias.cpp:10:7:10:7 | Y | UsingAliasTypedefType | file://:0:0:0:0 | int * |

cpp/ql/test/library-tests/using-aliases/using-alias.ql

@@ -0,0 +1,4 @@
+import cpp
+
+from TypedefType t
+select t, t.getCanonicalQLClass(), t.getUnderlyingType()