adding example to run tests

Author: fangohr

install/docker/Readme.md

@@ -18,6 +18,31 @@ To use it, you can try this:
 
 `docker run -ti fangohr/fidimag`
 
+This command should show a bash prompt inside the docker container:
+
+<pre>
+bin:docker fangohr$ docker run -ti fangohr/fidimag
+fidimag@38fdd2a0feb4:~$
+</pre>
+
+One way to test the installation is to run the unit tests:
+
+<pre>
+cd fidimag/tests/
+fidimag@38fdd2a0feb4:~/fidimag/tests$ py.test -v 
+========== test session starts =======================
+platform linux2 -- Python 2.7.6 -- pytest-2.5.1 -- /usr/bin/python
+collected 63 items 
+
+field_test.py:7: test_initialise_scalar PASSED
+field_test.py:13: test_initialise_vector PASSED
+test_2dpbc_cube.py:10: test_compute_field PASSED
+test_anis.py:7: test_anis PASSED
+.
+.
+.
+</pre>
+
 ## Creating the docker container
 
 ## Shortcomings