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vm_test.go
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//
// Copyright (c) 2022-2023 Markku Rossi
//
// All rights reserved.
//
package scheme
import (
"fmt"
"strings"
"testing"
)
var vmTests = []struct {
i string
v Value
o string
}{
{
i: `(display "The length of \"Hello, world!\" is ")
(display (string-length "Hello, world!"))
(display ".")
(newline)`,
o: `The length of "Hello, world!" is 13.
`,
},
{
i: `(define (print msg) (display msg) (newline))
(print "Hello, lambda!")
(print "Hello, world!")`,
o: `Hello, lambda!
Hello, world!
`,
},
{
i: `(define (print msg) (display msg) (newline))
(define msg "Hello, msg!")
(set! msg "Hello, set!")
(print msg)
`,
o: `Hello, set!
`,
},
{
i: `
(define (say-maker header msg trailer)
(lambda (pre post)
(display header)
(display pre)
(display msg)
(display post)
(display trailer)
(newline)))
(define a (say-maker "<html>" "Hello, a!" "</html>"))
(define b (say-maker "<div>" "Hello, b!" "</div>"))
(a "(" ")")
(b "{" "}")
`,
o: `<html>(Hello, a!)</html>
<div>{Hello, b!}</div>
`,
},
{
i: `(begin 1 2 3 4)`,
v: NewNumber(4),
o: ``,
},
{
i: `(define v (cons 1 2)) (set-car! v 42) v`,
v: NewPair(NewNumber(42), NewNumber(2)),
},
{
i: `(define v (cons 1 2)) (set-cdr! v 42) v`,
v: NewPair(NewNumber(1), NewNumber(42)),
},
{
i: `((lambda x x) 3 4 5 6)`,
v: NewPair(NewNumber(3),
NewPair(NewNumber(4),
NewPair(NewNumber(5),
NewPair(NewNumber(6),
nil)))),
},
{
i: `((lambda (x y . z) z) 3 4 5 6)`,
v: NewPair(NewNumber(5),
NewPair(NewNumber(6),
nil)),
},
{
i: `'()`,
v: nil,
},
{
i: `'(1 2)`,
v: NewPair(NewNumber(1), NewPair(NewNumber(2), nil)),
},
{
i: `(quote ())`,
v: nil,
},
{
i: `(quote (1 2))`,
v: NewPair(NewNumber(1), NewPair(NewNumber(2), nil)),
},
{
i: `'#t`,
v: Boolean(true),
},
{
i: `
(let ((x 2)
(y 3))
(* x y))
`,
v: NewNumber(6),
},
{
i: `
(let ((x 2)
(y 3))
(let ((x 7)
(z (+ x y)))
(* z x)))
`,
v: NewNumber(35),
},
{
i: `
(let ((x 2)
(y 3))
(let* ((x 7)
(z (+ x y)))
(* z x)))
`,
v: NewNumber(70),
},
{
i: `
(letrec ((even?
(lambda (n)
(if (zero? n)
#t
(odd? (- n 1)))))
(odd?
(lambda (n)
(if (zero? n)
#f
(even? (- n 1))))))
(even? 88))
`,
v: Boolean(true),
},
}
func TestVM(t *testing.T) {
for idx, test := range vmTests {
scm, err := New()
if err != nil {
t.Fatalf("failed to create virtual machine: %v", err)
}
stdout := &strings.Builder{}
scm.Stdout = NewPort(stdout)
v, err := scm.Eval(fmt.Sprintf("test-%d", idx),
strings.NewReader(test.i))
if err != nil {
t.Fatalf("Test %d: Eval failed: %v", idx, err)
}
if !Equal(v, test.v) {
fmt.Printf("Test %d:\n%s\n", idx, vmTests[idx].i)
fmt.Printf(" - result mismatch: got %v, expected %v\n",
v, test.v)
t.Errorf("Test %d: Eval failed: got %v, expected %v",
idx, v, test.v)
}
output := stdout.String()
if output != test.o {
fmt.Printf("Test %d:\n%s\n", idx, vmTests[idx].i)
fmt.Printf(" - output mismatch: got '%v', expected '%v'\n",
output, test.o)
t.Errorf("unexpected output: got '%v', expected '%v'",
output, test.o)
}
}
}