Add builtin method calls with no arguments

2 files changed, 16 insertions, 8 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 dbf20f8..6aee7d5 100644
--- a/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/interpreter/EvaluatorTests.java
@@ -13,6 +13,7 @@ import com.google.common.collect.ImmutableMap;
 import static org.junit.Assert.assertEquals;
 import static org.zwobble.couscous.ast.Assignment.assign;
 import static org.zwobble.couscous.ast.LiteralNode.literal;
+import static org.zwobble.couscous.ast.MethodCallNode.methodCall;
 import static org.zwobble.couscous.interpreter.Evaluator.eval;
 import static org.zwobble.couscous.tests.util.ExtraAsserts.assertThrows;
 
@@ -49,6 +50,13 @@ public class EvaluatorTests {
         assertEquals(new ConditionMustBeBoolean(new IntegerValue(1)), exception);
     }
     
+    @Test
+    public void canCallMethodWithNoArgumentsOnBuiltin() {
+        val result = eval(emptyEnvironment(),
+            methodCall(literal("hello"), "length"));
+        assertEquals(new IntegerValue(5), result);
+    }
+    
     private static Environment emptyEnvironment() {
         return new Environment(ImmutableMap.of());
     }
diff --git a/src/test/java/org/zwobble/couscous/tests/interpreter/InterpreterTests.java b/src/test/java/org/zwobble/couscous/tests/interpreter/InterpreterTests.java
index 54abd8a..bfdadf8 100644
--- a/src/test/java/org/zwobble/couscous/tests/interpreter/InterpreterTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/interpreter/InterpreterTests.java
@@ -29,6 +29,14 @@ import lombok.val;
 
 public class InterpreterTests {
     @Test
+    public void methodWithNoStatementsReturnsUnit() {
+        val method = staticMethod("hello");
+        val result = runMethod(method);
+        
+        assertEquals(UNIT, result);
+    }
+    
+    @Test
     public void canReturnLiteralValue() {
         val method = staticMethod("hello")
             .statement(new ReturnNode(LiteralNode.literal("hello, world!")));
@@ -69,14 +77,6 @@ public class InterpreterTests {
         
         assertEquals(new StringValue("[updated value]"), result);
     }
-    
-    @Test
-    public void methodWithNoStatementsReturnsUnit() {
-        val method = staticMethod("hello");
-        val result = runMethod(method);
-        
-        assertEquals(UNIT, result);
-    }
 
     private InterpreterValue runMethod(MethodNode.MethodNodeBuilder methodBuilder, InterpreterValue... arguments) {
         val method = methodBuilder.build();