Throw error on wrong number of arguments

1 files changed, 9 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 ee4f700..5ebb948 100644
--- a/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
@@ -6,6 +6,7 @@ import org.zwobble.couscous.ast.TernaryConditionalNode;
 import org.zwobble.couscous.interpreter.ConditionMustBeBoolean;
 import org.zwobble.couscous.interpreter.Environment;
 import org.zwobble.couscous.interpreter.NoSuchMethod;
+import org.zwobble.couscous.interpreter.WrongNumberOfArguments;
 import org.zwobble.couscous.values.IntegerValue;
 import org.zwobble.couscous.values.StringValue;
 
@@ -73,6 +74,14 @@ public class EvaluatorTests {
         assertEquals(new NoSuchMethod("size"), exception);
     }
     
+    @Test
+    public void errorIfWrongNumberOfArgumentsArePassed() {
+        val exception = assertThrows(WrongNumberOfArguments.class,
+            () -> eval(emptyEnvironment(),
+                methodCall(literal("hello"), "substring", literal(1))));
+        assertEquals(new WrongNumberOfArguments(2, 1), exception);
+    }
+    
     private static Environment emptyEnvironment() {
         return new Environment(ImmutableMap.of());
     }