Parse comments and knot declarations

tests/ParserTest.hx

@@ -1,11 +1,28 @@
 package tests;
 
 import hank.Parser;
+import hank.Parser.HankAST;
 
 class ParserTest extends utest.Test {
+    var ast: HankAST;
+
+    function nextExpr() {
+        var next = ast[0];
+        ast.remove(next);
+        return next.expr;
+    }
+
+    function assertNextExpr(expr: ExprType) {
+        HankAssert.equals(expr, nextExpr());
+    }
+
+
     function testParseMain() {
         var parser = new Parser();
-        var ast = parser.parseFile('examples/main/main.hank');
-        trace (ast);
+        ast = parser.parseFile('examples/main/main.hank');
+        assertNextExpr(EComment(" comments in Hank start with a double-slash"));
+        assertNextExpr(EComment(" Or you can split comments\nacross more than one line "));
+        assertNextExpr(EComment(" Or you can use block comments inline "));
+
     }
 }