JS: add regression test for ODASA-7506

Author: Esben Sparre Andreasen

javascript/ql/test/query-tests/React/UnusedOrUndefinedStateProperty/UnusedOrUndefinedStateProperty.expected

@@ -1,3 +1,4 @@
+| issue7506.js:12:1:12:34 | class C ... e\\n  }\\n} | Component state property 'p1' is $@, but it is never read. | issue7506.js:15:5:15:10 | p1: '' | written |
 | undefined.js:1:1:1:34 | class C ...     }\\n} | Component state property 'notWritten' is $@, but it is never written. | undefined.js:8:9:8:29 | this.st ... Written | read |
 | undefined.js:1:1:1:34 | class C ...     }\\n} | Component state property 'notWrittenButReadInChain' is $@, but it is never written. | undefined.js:9:9:9:43 | this.st ... InChain | read |
 | undefined.js:32:1:32:34 | class C ...     }\\n} | Component state property 'notWrittenThrougExternalPropertyAccess' is $@, but it is never written. | undefined.js:35:9:35:57 | this.st ... yAccess | read |

javascript/ql/test/query-tests/React/UnusedOrUndefinedStateProperty/issue7506.js

@@ -0,0 +1,23 @@
+class C1 extends React.Component {
+
+  state = {
+    p1: ''
+  }
+
+  static getDerivedStateFromProps(props, state) {
+    const { p1: p2 } = state
+  }
+}
+
+class C2 extends React.Component {
+
+  state = {
+    p1: ''
+  }
+
+  static getDerivedStateFromProps_unmodeled(props, state) {
+    const { p1: p2 } = state
+  }
+}
+
+// semmle-extractor-options: --experimental