1 files changed, 7 insertions, 0 deletions
diff --git a/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java b/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
index 6aee7d5..442c6e9 100644
--- a/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
@@ -57,6 +57,13 @@ public class EvaluatorTests {
         assertEquals(new IntegerValue(5), result);
     }
     
+    @Test
+    public void canCallMethodWithArgumentsOnBuiltin() {
+        val result = eval(emptyEnvironment(),
+            methodCall(literal("hello"), "substring", literal(1), literal(4)));
+        assertEquals(new StringValue("ell"), result);
+    }
+    
     private static Environment emptyEnvironment() {
         return new Environment(ImmutableMap.of());
     }