Added Module.id property (getter+setter).

Updated test/asm.py to use unittest.

test/asm.py

@@ -3,15 +3,27 @@
 from llvm import *
 from llvm.core import *
 
-# create a module
-m = Module.new('module1')
-m.add_global_variable(Type.int(), 'i')
+import unittest
 
-# write it's assembly representation to a file
-asm = str(m)
-print(asm, file=file("/tmp/testasm.ll", "w"))
+class TestAsm(unittest.TestCase):
+    def test_asm(self):
+        # create a module
+        m = Module.new('module1')
+        m.add_global_variable(Type.int(), 'i')
 
-# read it back into a module
-m2 = Module.from_assembly(file("/tmp/testasm.ll"))
-print(m2)
+        # write it's assembly representation to a file
+        asm = str(m)
 
+        with open("/tmp/testasm.ll", "w") as fout:
+            fout.write(asm)
+
+        # read it back into a module
+        with open("/tmp/testasm.ll") as fin:
+            m2 = Module.from_assembly(fin)
+            # The default `m.id` is '<string>'.
+            m2.id = m.id # Copy the name from `m`
+
+        self.assertEqual(str(m2).strip(), asm.strip())
+
+if __name__ == '__main__':
+    unittest.main()