added basic tests

test/test_helpers.py

@@ -0,0 +1,30 @@
+from unittest import TestCase
+
+from riscemu.helpers import *
+
+
+class Test(TestCase):
+    def test_int_to_bytes(self):
+        self.assertEqual(int_to_bytes(-1), bytearray([0xff] * 4), "-1")
+        self.assertEqual(int_to_bytes(1), bytearray([0, 0, 0, 1]), "1")
+        self.assertEqual(int_to_bytes(1231132), bytearray(b'\x00\x12\xc9\x1c'), "random number")
+        self.assertEqual(int_to_bytes(-1231132), bytearray(b'\xff\xed6\xe4'), "random negative number")
+
+    def test_int_from_bytes(self):
+        self.assertEqual(bytearray([0xff] * 4), int_to_bytes(-1), "-1")
+        self.assertEqual(bytearray([0, 0, 0, 1]), int_to_bytes(1), "1")
+        self.assertEqual(bytearray(b'\x00\x12\xc9\x1c'), int_to_bytes(1231132), "random number")
+        self.assertEqual(bytearray(b'\xff\xed6\xe4'), int_to_bytes(-1231132), "random negative number")
+
+    def test_to_unsigned(self):
+        self.assertEqual(to_unsigned(-1), 0xFFFFFFFF)
+        self.assertEqual(to_unsigned(-100), 0xffffff9c)
+        self.assertEqual(to_unsigned(1), 1)
+        self.assertEqual(to_unsigned(0xffffffff), 0xffffffff)
+        self.assertEqual(to_unsigned(0xffed36e4), 0xffed36e4)
+
+    def test_to_signed(self):
+        self.assertEqual(to_signed(0xFFFFFFFF), -1)
+        self.assertEqual(to_signed(0xffed36e4), -1231132)
+        self.assertEqual(to_signed(0x0FFFFFFF), 0x0FFFFFFF)
+