simplify test case

Author: aeberhart

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

@@ -130,9 +130,8 @@ public void evalTest() {
 
   @Test
   public void regexTest() {
-    Assertions.assertEquals(Map.of("foo", 1), jsonata(
-        "($matcher := $eval('/^' & 'foo' & '/i'); $.$spread()[$.$keys() ~> $matcher])")
-        .evaluate(Map.of("foo", 1, "bar", 2)));
+    // check for IndexOutOfBoundsException
+    jsonata("/endsWithSlash-i/i");
   }
 
   @Disabled