Add argument to matlab920 test & change default test

.gitlab-ci.yml

@@ -22,6 +22,7 @@ test-matlab920:
   - cd matlab
   variables:
     MATLABCMD: matlab920
+    TESTCASE: basic
 
 .test-matlab850-deployed:
   extends: .test-template-deployed

matlab/run_gdat_tests.m

@@ -3,8 +3,8 @@ function [passed,results] = run_gdat_tests(test_case)
 
 % F. Felici, EPFL federico.felici@epfl.ch
 
-if nargin==0
-  test_case = 'all'; % default
+if nargin==0 || isempty(test_case)
+  test_case = 'basic'; % default
 end
 
 %% populate suite