Go: Add test for AliasType extraction

go/ql/test/library-tests/semmle/go/Types/Aliases.expected

@@ -0,0 +1,37 @@
+| DirEntry | file://:0:0:0:0 | DirEntry |
+| FileInfo | file://:0:0:0:0 | FileInfo |
+| FileMode | file://:0:0:0:0 | FileMode |
+| GenericSignatureAlias | generic.go:84:6:84:21 | GenericSignature |
+| Kind | file://:0:0:0:0 | Kind |
+| Kind | file://:0:0:0:0 | basic interface type |
+| PathError | file://:0:0:0:0 | PathError |
+| TypeAlias | generic.go:36:6:36:17 | GenericArray |
+| _type | file://:0:0:0:0 | Type |
+| aNameOff | file://:0:0:0:0 | NameOff |
+| aTextOff | file://:0:0:0:0 | TextOff |
+| aTypeOff | file://:0:0:0:0 | TypeOff |
+| any | file://:0:0:0:0 | Kind |
+| any | file://:0:0:0:0 | basic interface type |
+| arrayType | file://:0:0:0:0 | ArrayType |
+| arraytype | file://:0:0:0:0 | ArrayType |
+| chanType | file://:0:0:0:0 | ChanType |
+| chantype | file://:0:0:0:0 | ChanType |
+| funcType | file://:0:0:0:0 | FuncType |
+| functype | file://:0:0:0:0 | FuncType |
+| interfaceType | file://:0:0:0:0 | InterfaceType |
+| interfacetype | file://:0:0:0:0 | InterfaceType |
+| maptype | file://:0:0:0:0 | MapType |
+| name | file://:0:0:0:0 | Name |
+| nameOff | file://:0:0:0:0 | NameOff |
+| ptrType | file://:0:0:0:0 | PtrType |
+| ptrtype | file://:0:0:0:0 | PtrType |
+| sliceType | file://:0:0:0:0 | SliceType |
+| slicetype | file://:0:0:0:0 | SliceType |
+| structField | file://:0:0:0:0 | StructField |
+| structType | file://:0:0:0:0 | StructType |
+| structtype | file://:0:0:0:0 | StructType |
+| syscallErrorType | file://:0:0:0:0 | Errno |
+| textOff | file://:0:0:0:0 | TextOff |
+| typeOff | file://:0:0:0:0 | TypeOff |
+| uncommonType | file://:0:0:0:0 | UncommonType |
+| uncommontype | file://:0:0:0:0 | UncommonType |

go/ql/test/library-tests/semmle/go/Types/Aliases.ql

@@ -0,0 +1,4 @@
+import go
+
+from AliasType at
+select at.getName(), at.getRhs()