JS: add test case

Author: asger-semmle

javascript/ql/test/query-tests/Declarations/DeadStoreOfProperty/DeadStoreOfProperty.expected

@@ -1,3 +1,4 @@
+| accessors.js:2:3:2:21 | static get foo() {} | This write to property 'foo' is useless, since $@ always overrides it. | accessors.js:3:3:3:22 | static set foo(v) {} | another property write |
 | fieldInit.ts:10:3:10:8 | f = 4; | This write to property 'f' is useless, since $@ always overrides it. | fieldInit.ts:13:5:13:14 | this.f = 5 | another property write |
 | real-world-examples.js:5:4:5:11 | o.p = 42 | This write to property 'p' is useless, since $@ always overrides it. | real-world-examples.js:10:2:10:9 | o.p = 42 | another property write |
 | real-world-examples.js:15:9:15:18 | o.p1 += 42 | This write to property 'p1' is useless, since $@ always overrides it. | real-world-examples.js:15:2:15:18 | o.p1 = o.p1 += 42 | another property write |

javascript/ql/test/query-tests/Declarations/DeadStoreOfProperty/accessors.js

@@ -0,0 +1,7 @@
+class C {
+  static get foo() {} // OK
+  static set foo(v) {} // OK
+  
+  get bar() {} // OK
+  set bar(v) {} // OK
+}