[sql-hint addon] Add test for alias completion

Issue #3248

test/sql-hint-test.js

@@ -159,6 +159,15 @@
     to: Pos(0, 15)
   });
 
+  test("alias_complete", {
+    value: "SELECT t. FROM users t",
+    cursor: Pos(0, 9),
+    tables: simpleTables,
+    list: ["t.name", "t.score", "t.birthDate"],
+    from: Pos(0, 7),
+    to: Pos(0, 9)
+  });
+
   function deepCompare(a, b) {
     if (!a || typeof a != "object")
       return a === b;