Resolve "Setup test proxy certificates and basic VOMS module testing"

First solution to issue #1 (closed) using the Openresty test-suite. Proposals for the simplest test cases.

t/README.md

-# ngx_http_voms_module testing 
+# ngx\_http\_voms\_module Testing 
 
 ## Description
 
+Setup and files to test the *ngx\_http\_voms\_module* are contained in the **t** folder. The [Openresty data-driven testsuite](https://openresty.gitbooks.io/programming-openresty/content/testing/) has been adopted for testing.
 
+### Voms proxy certificates 
+
+Proxy certificates are in the **certs** folder:
+
+ * 0.pem: long-lived proxy, no AC;
+ * 1.pem: long-lived proxy, expired AC;
+ * 2.pem: expired proxy certificate.
+
+Proxy certificates are generated using [VOMS client 3.3.0](http://italiangrid.github.io/voms/documentation/voms-clients-guide/3.0.3/). 
+
+The following options are evoked:
+
+	VOMS_CLIENTS_JAVA_OPTIONS="-Dvoms.fake.vo=test.vo -Dvoms.fake=true -Dvoms.fake.aaCert=<path_to_cert>/voms_example.cert.pem -Dvoms.fake.aaKey=<path_to_key>/voms_example.key.pem" voms-proxy-init3 -voms test.vo -cert <path_to_test0>/test0.p12 --valid <validity>
+
+*voms\_example.cert.pem* and *voms\_example.ket.pem* can be found in the **certs** folder. 
+
+To perform correctly the VOMS server connection, an *.lsc or *.pem file is needed in **/etc/grid-security/vomsdir**, see [VOMS client 3.3.0 User Guide](http://italiangrid.github.io/voms/documentation/voms-clients-guide/3.0.3/) for further details. An example of *voms.example.lsc* can be found in **vomsdir/test.vo**.
+
+The *vomses* configuration is not actually needed for *voms-proxy-fake* evocations.
+
+### Test Description
+
+  * *empty\_voms\_proxy.t*: 
+    
+    **Input ->** 0.pem certificate and key. 
+    
+    **Expected output ->** 200-error-code, empty voms variables. 
+    
+    **Error log ->** "VOMS extension not found".
+   
+  * *expired\_ac\_proxy.t*: 
+
+    **Input ->** 1.pem certificate and key. 
+
+    **Expected output ->** 200-error-code, empty voms variables. 
+
+    **Error log ->** "AC not valid anymore".
+
+  * *expired\_proxy.t*: 
+   
+    **Input ->** 2.pem certificate and key. 
+   
+    **Expected output ->** 400-error-code, empty nginx variables.
+
+    ** Error log ->** "certificate has expired".
+ 
+Trust-anchors (igi-test-ca.pem) are contained in the **trust-anchors** folder. Nginx server certificate and key (nginx\_voms\_example.cert.pem and nginx\_voms\_example\_key.pem) are in the **certs** folder.
+
+### Running Tests
+
+To run the tests made available in the **t** folder just type
+
+	prove -v t
+
+
+Using the docker image provided to exploit Openresty in the Storm2 project:
+
+	docker run --rm -it -v /path/to/ngx_http_voms_module:/home/build/ngx_http_voms_module storm2/ngx-voms-build
+	cd openresty-1.x.y
+	./configure ${resty_config_options} --add-module=../ngx_http_voms_module
+	make && make install
+	cd ..
+	sudo chown build.build -R t
+	prove -v t