Fix wrong test

Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Niklas Hambuechen <niklash@google.com>

Cherry-picked from bf1893c828669f3a58e206d7b4cbedea1b640ebf

Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>
Add developer target py-tests

Add a target to manually run the python tests, and no other
tests. In the same way as the hs-tests target simplifies testing
Haskell changes while developing Haskell code, this target
simplifies developing python code.

Signed-off-by: Klaus Aehlig <aehlig@google.com>
Signed-off-by: Niklas Hambuechen <niklash@google.com>
Reviewed-by: Niklas Hambuechen <niklash@google.com>

Cherry-picked from 5b8754f4f

Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>