JavaScript: Consolidate tutorial tests.

javascript/ql/test/tutorials/Introducing the JavaScript libraries/query7.qll

@@ -0,0 +1,18 @@
+import javascript
+
+query predicate test_query7(
+  DeclStmt ds, string res0, VariableDeclarator d1, string res1, VariableDeclarator d2, string res2
+) {
+  exists(Variable v, int i, int j |
+    d1 = ds.getDecl(i) and
+    d2 = ds.getDecl(j) and
+    i < j and
+    v = d1.getBindingPattern().getAVariable() and
+    v = d2.getBindingPattern().getAVariable() and
+    not ds.getTopLevel().isMinified()
+  |
+    res0 = "Variable " + v.getName() + " is declared both $@ and $@." and
+    res1 = "here" and
+    res2 = "here"
+  )
+}