bunch of simple tests.

diff --git a/src/sicp/metacircular2-test.rkt b/src/sicp/metacircular2-test.rkt
index 7138ec2d56914dc57faa0dad535202168e38f703..563b0ec846fb4ac8bd1a3cc75238da83191f00f6 100644 (file)
--- a/src/sicp/metacircular2-test.rkt
+++ b/src/sicp/metacircular2-test.rkt
@@ -1,4 +1,40 @@
 #lang racket
 
 (require "metacircular2.rkt"
-         rackunit)
\ No newline at end of file
+         rackunit)
+
+(require rackunit/text-ui)
+
+(define metacircular2-tests
+  (test-suite "test suite for meta circular evaluator"
+   (let ([env1 (make-environment)])
+     (check-equal? (eval '(+ 1 1) env1) 2 "simple addition")
+     (check-equal? (eval '(- 2 1) env1) 1 "simple subtraction")
+     (check-equal? (eval '(quote x) env1) 'x "quote")
+     (eval '(define x 20) env1)
+     (check-equal? (eval 'x env1) 20 "definition of identifiers with simple values")
+     (eval '(set! x 42) env1) 
+     (check-equal? (eval 'x env1) 42 "set!")
+     (eval '(define (square x) (* x x)) env1)
+     (check-equal? (eval '(square 10) env1) 100 "simple function definition")
+     (eval '(define (square x) (let ([s (* x x)]) s)) env1)
+     (check-equal? (eval '(square 20) env1) 400 "different way to define square")
+     (eval '(define (absolute x)
+              (cond ((> x 0) x)
+                    ((= x 0) (display 'zero) 0)
+                    (else (- x))))
+           env1)
+     (check-equal? (eval '(absolute -2) env1) 2 "conditionals")
+     (check-equal? (eval '(absolute 2) env1) 2 "conditionals")
+     (eval '(define (foo) (let ((x 42) (y 100)) (list x y))) env1)
+     (check-equal? (eval '(foo) env1) '(42 100) "simple let")
+     (check-equal? (eval '(let* ((x 3)
+                                 (y (+ x 2))
+                                 (z (+ x y 5)))
+                            (* x z))
+                         env1)
+                   39
+                   "let* test"))))
+
+
+(run-tests metacircular2-tests)
\ No newline at end of file