Incorrect result for transform expression #96

Author: aeberhart

src/main/java/com/dashjoin/jsonata/Jsonata.java

@@ -464,7 +464,7 @@ Frame createFrameFromTuple(Frame environment, Map<String, Object> tuple) {
                     if((res instanceof JList) && ((JList)res).tupleStream) {
                         tuple.putAll((Map)res.get(bb));
                     } else {
-                        if (expr.focus!=null) {
+                        if (expr.focus!=null && !expr.focus.equals("")) {
                             tuple.put(expr.focus, res.get(bb));
                             tuple.put("@", tupleBindings.get(ee).get("@"));
                         } else {

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

@@ -1,13 +1,12 @@
 package com.dashjoin.jsonata;
 
+import java.util.Map;
 import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import com.dashjoin.jsonata.json.Json;
 
 public class VariableTest {
 
-  @Disabled
   @Test
   public void testContextVariable() {
     var input = Json.parseJson("{\n"
@@ -25,4 +24,9 @@ public void testContextVariable() {
         + "                  })");
     Assertions.assertEquals("{documentIdentityNumber=ABC123456, documentIdentityType=ID_CARD}", e.evaluate(input) + "");
   }
+  
+  @Test void testContextVariableSimple() {
+    var e = Jsonata.jsonata("model@$");
+    Assertions.assertEquals(123, e.evaluate(Map.of("model", 123)));
+  }
 }