1 files changed, 109 insertions, 0 deletions
diff --git a/test.c b/test.c
new file mode 100644
index 0000000..0e462b9
--- /dev/null
+++ b/test.c
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "lisp.h"
+#include "lex.yy.h"
+#include "lisp.tab.h"
+
+static int tests_run = 0;
+static int tests_failed = 0;
+
+env *global_env = NULL;
+
+#define ASSERT(cond, msg) do {		\
+	tests_run++;			\
+	if (!(cond)) {			\
+		tests_failed++;		\
+		printf("FAIL: %s\n", msg);	\
+	} else {			\
+		printf("PASS: %s\n", msg);	\
+	}				\
+} while (0)
+
+void test_make_int() {
+	value *v = make_int(42);
+	ASSERT(v->type == VALTYPE_INT, "make_int sets type");
+	ASSERT(v->as.i == 42, "make_int sets value");
+}
+
+void test_cons_car_cdr() {
+	value *a = make_int(1);
+	value *b = make_int(2);
+	value *p = cons(a, b);
+
+	ASSERT(p->type == VALTYPE_PAIR, "cons creates pair");
+	ASSERT(car(p)->as.i == 1, "car works");
+	ASSERT(cdr(p)->as.i == 2, "cdr works");
+}
+
+
+void test_env_define_lookup() {
+	env *e = env_create(NULL);
+	value *v = make_int(10);
+
+	env_define(e, "x", v);
+	value *found = env_lookup(e, "x");
+
+	ASSERT(found != NULL, "env_lookup finds symbol");
+	ASSERT(found->as.i == 10, "env_lookup returns correct value");
+}
+
+void test_env_parent_lookup() {
+	env *parent = env_create(NULL);
+	env_define(parent, "x", make_int(5));
+
+	env *child = env_create(parent);
+	value *found = env_lookup(child, "x");
+
+	ASSERT(found != NULL, "lookup finds parent symbol");
+	ASSERT(found->as.i == 5, "parent symbol value correct");
+}
+
+void test_eval_literal() {
+	env *e = env_create(NULL);
+
+	value *v = make_int(7);
+	value *r = eval(e, v);
+
+	ASSERT(r->as.i == 7, "eval of int returns itself");
+}
+
+void test_eval_symbol() {
+	env *e = env_create(NULL);
+	env_define(e, "x", make_int(99));
+
+	value *sym = make_symbol("x");
+	value *r = eval(e, sym);
+
+	ASSERT(r->as.i == 99, "eval resolves symbol");
+}
+
+
+void test_define() {
+	env *e = env_create(NULL);
+
+	value *expr =cons(make_symbol("define"),
+			cons(make_symbol("x"),
+				cons(make_int(3), make_nil())));
+
+	eval(e, expr);
+	value *r = env_lookup(e, "x");
+
+	ASSERT(r != NULL, "define creates binding");
+	ASSERT(r->as.i == 3, "define sets correct value");
+}
+
+int main(void) {
+	test_make_int();
+	test_cons_car_cdr();
+	test_env_define_lookup();
+	test_env_parent_lookup();
+	test_eval_literal();
+	test_eval_symbol();
+	test_define();
+
+	printf("\nTests run: %d\n", tests_run);
+	printf("Tests failed: %d\n", tests_failed);
+
+	return tests_failed ? 1 : 0;
+}