Force arrays to have a safety check

Improves BrainFuck

2 files changed, 21 insertions, 2 deletions

diff --git a/chapter15/src/test/java/com/seaofnodes/simple/BrainFuckTest.java b/chapter15/src/test/java/com/seaofnodes/simple/BrainFuckTest.java
index 894abbf6..03a22c55 100644
--- a/chapter15/src/test/java/com/seaofnodes/simple/BrainFuckTest.java
+++ b/chapter15/src/test/java/com/seaofnodes/simple/BrainFuckTest.java
@@ -26,7 +26,7 @@ public class BrainFuckTest {
                 encoded + """
 int pc = 0;
 int d = 0;
-u8[] data = new u8[10000];
+u8[] data = new u8[100];
 int i=0;
 while(i < data#) {
     data[i] = 0;
@@ -92,6 +92,6 @@ return result;
         for (byte b : "Hello Wo".getBytes(StandardCharsets.UTF_8)) {
             expected = (expected << 8) | b;
         }
-        assertEquals(expected, Evaluator.evaluate(stop, 0, 100000));
+        assertEquals(expected, Evaluator.evaluate(stop, 0, 10000));
     }
 }
diff --git a/chapter15/src/test/java/com/seaofnodes/simple/Chapter15Test.java b/chapter15/src/test/java/com/seaofnodes/simple/Chapter15Test.java
index 1aee2f0d..266d8a47 100644
--- a/chapter15/src/test/java/com/seaofnodes/simple/Chapter15Test.java
+++ b/chapter15/src/test/java/com/seaofnodes/simple/Chapter15Test.java
@@ -24,6 +24,25 @@ return 3.14;
     }
 
     @Test
+    public void testSafetyCheck() {
+        Parser parser = new Parser(
+"""
+u8[] old = new u8[0];
+u8[] output = new u8[1];
+int i = 0;
+while (i < old#) {
+    output[i] = old[i];
+    i = i + 1;
+}
+output[i] = 1;
+return output;
+""");
+        StopNode stop = parser.parse(false).iterate(true);
+        assertEquals("return u8[];", stop.toString());
+        assertEquals("Obj<u8[]> {\n  #=1\n  []=1\n}", Evaluator.evaluate(stop,  0).toString());
+    }
+
+    @Test
     public void testBasic1() {
         Parser parser = new Parser(
 """