add test for bindings.removeMember()

Author: wirthi

graal-js/src/com.oracle.truffle.js.test/src/com/oracle/truffle/js/test/polyglot/JavaScriptLanguageTest.java

@@ -41,6 +41,7 @@
 package com.oracle.truffle.js.test.polyglot;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 import java.util.Collections;
@@ -160,4 +161,18 @@ public String toString() {
             return "string";
         }
     }
+
+    @Test
+    public void testRemoveBindings() {
+        try (Context context = JSTest.newContextBuilder().build()) {
+            Value bindings = context.getBindings("js");
+            assertTrue(bindings.removeMember("eval"));
+
+            assertFalse(bindings.hasMember("foo"));
+            context.eval(JavaScriptLanguage.ID, "foo=42;");
+            assertTrue(bindings.hasMember("foo"));
+            assertTrue(bindings.removeMember("foo"));
+            assertFalse(bindings.hasMember("foo"));
+        }
+    }
 }