Using unit tests for testing

.gitignore

@@ -1,3 +1,4 @@
 
 .dir-locals.el
 __pycache__
+.#*

test.py

@@ -1,53 +0,0 @@
-from register import Accumulator
-
-TESTS = []
-
-
-def test(func):
-    global TESTS
-    TESTS.append(func)
-    return func
-
-
-@test
-def test_set():
-    pass
-
-
-@test
-def test_get():
-    pass
-
-
-@test
-def test_get_signed():
-    pass
-
-
-@test
-def test_negate():
-    pass
-
-
-@test
-def test_shift_right():
-    pass
-
-
-@test
-def test_shift_left():
-    pass
-
-
-@test
-def test_add():
-    pass
-
-
-@test
-def test_subtract():
-    pass
-
-if __name__ == "__main__":
-    for test_func in TESTS:
-        test_func()

tests.py

@@ -0,0 +1,91 @@
+import random
+from unittest import TestCase
+
+from register import Accumulator, Register
+
+TESTS = []
+
+
+class RegisterTest(TestCase):
+    def setUp(self):
+        Register.registers = []
+        self.test_accumulator = Accumulator(8)
+        self.test_register = Register(8)
+
+
+class TestSetterGetter(RegisterTest):
+    def test_set(self):
+        test_val = random.randint(0, 255)
+        self.test_register.set(test_val)
+        self.assertEqual(test_register.value, test_val)
+
+    def test_set_overflow(self):
+        test_val = random.randint(256, 1024)
+        self.test_register.set(test_val)
+        self.assertEqual(test_val % 256, self.test_register.value)
+
+    def test_2s_complement(self):
+        test_val = -randint(0, 127)
+        self.test_register.set(test_val)
+        self.assertEqual(self.test_register.get_signed(), test_val)
+
+    def test_2s_complement_overflow(self):
+        test_val = -randint(128, 1024)
+        self.test_register.set(test_val)
+        self.assertEqual(self.test_register.value, test_val % -128)
+
+
+class TestNegation(RegisterTest):
+    def test_negate(self):
+        test_val = random.randint(0, 127)
+        self.test_register.set(test_val)
+        self.test_register.negate()
+        self.assertEqual(self.test_register.get_signed(), -test_val)
+
+    def test_negate_overflow(self):
+        test_val = random.randint(128, 1024)
+        self.test_register.set(test_val)
+        self.test_register.negate()
+        self.assertEqual(self.test_register.get_signed())
+
+    def test_negate_negative(self):
+
+        test_val = -random.randint(0, 127)
+        self.test_register.set(test_val)
+        self.test_register.negate()
+        self.assertEqual(self.test_register.get_signed(), -test_val)
+
+    def test_negate_negative_overflow(self):
+        test_val = -random.randint(128, 1024)
+        self.test_register.set(test_val)
+        self.test_register.negate()
+        self.assertEqual(self.test_register.get_signed())
+
+
+class TestAritmetic(RegisterTest):
+    pass
+
+
+@test
+def test_shift_right():
+    pass
+
+
+@test
+def test_shift_left():
+    pass
+
+
+@test
+def test_add():
+    pass
+
+
+@test
+def test_subtract():
+    pass
+
+
+if __name__ == "__main__":
+    for test_func in TESTS:
+        test_func()