add test for starting a python context without any allowed access

Author: timfel

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/interop/JavaInteropTest.java

@@ -46,12 +46,13 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.UnsupportedEncodingException;
 import java.util.Arrays;
 import java.util.List;
-import java.io.UnsupportedEncodingException;
 
 import org.graalvm.polyglot.Context;
 import org.graalvm.polyglot.Context.Builder;
+import org.graalvm.polyglot.Engine;
 import org.graalvm.polyglot.Source;
 import org.graalvm.polyglot.Value;
 import org.junit.After;
@@ -434,4 +435,19 @@ public void accessJavaObjectGetters() throws IOException {
                         "True <class 'bool'>\n" +
                         "c <class 'str'>\n", out.toString("UTF-8"));
     }
+
+    @Test
+    public void testSharedEngineNoAccess() {
+        try (Engine engine = Engine.create()) {
+            Source source = Source.create("python", "21 + 21");
+            try (Context ctxt = Context.newBuilder().engine(engine).allowAllAccess(false).build()) {
+                int v = ctxt.eval(source).asInt();
+                assert v == 42;
+            }
+            try (Context ctxt = Context.newBuilder().engine(engine).allowAllAccess(false).build()) {
+                int v = ctxt.eval(source).asInt();
+                assert v == 42;
+            }
+        }
+    }
 }