diff --git a/build.sh b/build.sh
index 58b4f73..0de9ebf 100755
--- a/build.sh
+++ b/build.sh
@@ -68,9 +68,6 @@ ar rcs build/libnoja-runtime.a \
 	build/libnoja-compile.a \
 	build/libnoja-objects.a
 
-gcc tests/src/test-parse.c   -o build/test-parse   $FLAGS -Lbuild/ -lnoja-compile -lxjson
-gcc tests/src/test-objects.c -o build/test-objects $FLAGS -Lbuild/ -lnoja-objects
-
 gcc src/main.c \
     src/noja.c \
 	temp/o_builtins.o \
diff --git a/src/objects/o_int.c b/src/objects/o_int.c
index 883ebd3..9fcbd65 100644
--- a/src/objects/o_int.c
+++ b/src/objects/o_int.c
@@ -1,10 +1,12 @@
 #include <assert.h>
 #include <string.h>
 #include "objects.h"
+#include "../utils/hash.h"
 
 static long long int to_int(Object *obj, Error *err);
 static void print(Object *obj, FILE *fp);
 static _Bool op_eql(Object *self, Object *other);
+static int hash(Object *self);
 
 typedef struct {
 	Object base;
@@ -16,11 +18,22 @@ static TypeObject t_int = {
 	.name = "int",
 	.size = sizeof (IntObject),
 	.atomic = ATMTP_INT,
+	.hash = hash,
 	.to_int = to_int,
 	.print = print,
 	.op_eql = op_eql,
 };
 
+static int hash(Object *self)
+{
+	assert(self != NULL);
+	assert(self->type == &t_int);
+
+	IntObject *iobj = (IntObject*) self;
+
+	return hashbytes((unsigned char*) &iobj->val, sizeof(iobj->val));
+}
+
 static long long int to_int(Object *obj, Error *err)
 {
 	assert(obj != NULL);
diff --git a/tests/test.noja b/tests/test.noja
index a26c848..5d2d8ba 100644
--- a/tests/test.noja
+++ b/tests/test.noja
@@ -69,6 +69,23 @@
 	assert((false or false) == false);
 }
 
+# Test lists.
+{
+	[1]; [1.0]; ['x']; [1, 1]; [1.0, 1.0]; ['x', 'x'];
+}
+
+# Test maps.
+{
+	({}); 
+	({'': none});
+	({1: none});
+	({1.0: none});
+	({true: none});
+	({false: none});
+	({[]: none});
+	({{}: none});
+}
+
 # Test if-else statements.
 {
 	if true: r = true; else r = false;