bugfix: remove dummy spaces from asm code

This prevents errors in later preprocessing.
Also add some tests.

Names the test file `test_optimizer_asm` to avoid name clash
with other `test_asm`.

Author: boriel

arch/zx48k/optimizer/asm.py

@@ -13,6 +13,8 @@ class Asm(object):
     """
     def __init__(self, asm):
         assert isinstance(asm, str)
+        asm = asm.strip()
+        assert asm, "Empty instruction '{}'".format(asm)
         self.inst = Asm.inst(asm)
         self.oper = Asm.opers(asm)
         self.asm = '{} {}'.format(self.inst, ' '.join(asm.split(' ', 1)[1:])).strip()

tests/arch/zx48k/optimizer/test_optimizer_asm.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+
+import unittest
+from arch.zx48k.optimizer import asm
+
+
+class TestASM(unittest.TestCase):
+    """ Tests optimizer Asm class
+    """
+    def test_spaces(self):
+        a = asm.Asm('   nop  \t\n')
+        self.assertEqual(a.asm, 'nop')
+
+    def test_raises_error_on_empty_instruction(self):
+        self.assertRaises(AssertionError, asm.Asm, '  \t \n')
+
+    def test_unknown_instruction(self):
+        a = asm.Asm(' unknown instr ')
+        self.assertEqual(a.bytes, ())