$eval() "forgets" registered functions when called within

parenthesis #58

Author: aeberhart

src/test/java/com/dashjoin/jsonata/CustomFunctionTest.java

@@ -17,6 +17,21 @@ public void testSupplier() {
     Assertions.assertEquals("Hello world", expression.evaluate(null));
   }
 
+  @Test
+  public void testEval() {
+    var expression = Jsonata.jsonata("$eval('$greet()')");
+    expression.registerFunction("greet", () -> "Hello world");
+    Assertions.assertEquals("Hello world", expression.evaluate(null));
+  }
+
+  @Disabled
+  @Test
+  public void testEvalWithParams() {
+    var expression = Jsonata.jsonata("($eval('$greet()'))");
+    expression.registerFunction("greet", () -> "Hello world");
+    Assertions.assertEquals("Hello world", expression.evaluate(null));
+  }
+
   @Test
   public void testUnary() {
     var expression = Jsonata.jsonata("$echo(123)");