Add a test for redefining variables in chapter 3

1 files changed, 10 insertions, 0 deletions

diff --git a/chapter03/src/test/java/com/seaofnodes/simple/Chapter03Test.java b/chapter03/src/test/java/com/seaofnodes/simple/Chapter03Test.java
index bdb1d9ea..3b8b3449 100644
--- a/chapter03/src/test/java/com/seaofnodes/simple/Chapter03Test.java
+++ b/chapter03/src/test/java/com/seaofnodes/simple/Chapter03Test.java
@@ -55,6 +55,16 @@ public class Chapter03Test {
     }
 
     @Test
+    public void testRedeclareVar() {
+        try {
+            new Parser("int a=1; int b=2; int c=0; int b=3; c=a+b;").parse();
+            fail();
+        } catch( RuntimeException e ) {
+            assertEquals("Redefining name 'b'",e.getMessage());
+        }
+    }
+
+    @Test
     public void testBad1() {
         try {
             new Parser("int a=1; int b=2; int c=0; { int b=3; c=a+b;").parse();