start on some REAL tests

coro/asn1/test/t_real.py

+# -*- Mode: Python -*-
+
+# test asn.1 real encoding
+
+# Note: you'll need version pyasn1-0.1.4+
+from pyasn1.codec.ber import decoder
+from coro.asn1.ber import *
+
+def go (f):
+    d = encode_double (f)
+    r = decoder.decode (d)[0]
+    f0 = float (r)
+    return f, f0, r, d
+
+print go (1.0e9)
+print go (3.14159265358979323846)
+print go (1e1000)
+print go (-1e1000)
+print go (1e300)
+print go (-1e300)
+print go (1e-5)
+print go (-1e-5)
+