JS: Add test

Author: asgerf

javascript/ql/test/library-tests/frameworks/data/test.ext.yml

@@ -10,6 +10,7 @@ extensions:
       - ['testlib', 'Member[MethodDecorator].DecoratedMember.Parameter[0]', 'test-source']
       - ['testlib', 'Member[ParamDecoratorSource].DecoratedParameter', 'test-source']
       - ['testlib', 'Member[getSource].ReturnValue', 'test-source']
+      - ['testlib', 'Member[getSourceArray].ReturnValue.ArrayElement', 'test-source']
       - ['(testlib)', 'Member[parenthesizedPackageName].ReturnValue', 'test-source']
       - ['danger-constant', 'Member[danger]', 'test-source']
 

javascript/ql/test/library-tests/frameworks/data/test.js

@@ -278,3 +278,8 @@ function dangerConstant() {
   sink("danger-constant".safe); // OK
   sink("danger-constant"); // OK
 }
+
+function arraySource() {
+  const source = testlib.getSourceArray();
+  sink(source[0]); // NOT OK [INCONSISTENCY]
+}