[WIP] Test table coverage

I've added a few tests just so you guys can see my progress. I hope to have it fully tested today or tomorrow.
Looking at the code I think that you should remove the dtype property but
not the schema property

On Tue, Sep 23, 2014 at 10:42 AM, Brittain Hard <notifications@github.com>
wrote:

> In blaze/expr/tests/test_table.py:
>
> > @@ -30,10 +30,13 @@
> >  def test_dshape():
> >      t = TableSymbol('t', '{name: string, amount: int}')
> >      assert t.dshape == dshape('var * {name: string, amount: int}')
> > +    with pytest.raises(TypeError):
> > +        t.dtype
>
> Do i also need to remove the same properties from TableExpr?
>
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> <https://github.com/ContinuumIO/blaze/pull/642/files#r17912664>.
>