JS: Add exception test case

javascript/ql/test/library-tests/TripleDot/exceptions.js

@@ -0,0 +1,65 @@
+import 'dummy';
+
+function e1() {
+    let array = [source('e1.1')];
+    try {
+        array.forEach(x => {
+            throw x;
+        });
+        array.forEach(x => {
+            throw source('e1.2');
+        });
+    } catch (err) {
+        sink(err); // $ hasValueFlow=e1.2 hasValueFlow=e1.1
+    }
+}
+
+function e2() {
+    let array = [source('e2.1')];
+    try {
+        array.unknown(x => {
+            throw x;
+        });
+        array.unknown(x => {
+            throw source('e2.2');
+        });
+    } catch (err) {
+        sink(err); // $ MISSING: hasValueFlow=e2.2
+    }
+}
+
+function e3() {
+    const events = getSomething();
+    try {
+        events.addEventListener('click', () =>{
+            throw source('e3.1');
+        });
+        events.addListener('click', () =>{
+            throw source('e3.2');
+        });
+        events.on('click', () =>{
+            throw source('e3.3');
+        });
+        events.unknownMethod('click', () =>{
+            throw source('e3.4');
+        });
+    } catch (err) {
+        sink(err); // $ MISSING: hasValueFlow=e3.4
+    }
+}
+
+function e4() {
+    function thrower(array) {
+        array.forEach(x => { throw x });
+    }
+    try {
+        thrower([source("e4.1")]);
+    } catch (e) {
+        sink(e); // $ hasValueFlow=e4.1
+    }
+    try {
+        thrower(["safe"]);
+    } catch (e) {
+        sink(e); // $ SPURIOUS: hasValueFlow=e4.1
+    }
+}