mono - How to read Environment variable set by Travis CI in C# -

i've created unit test project requires key not public, locally can read app.config travis ci doesn't have key.

so i've added environment variable in travis ci this:

when travis ci build starts displays variable in log:

setting environment variables repository settings
$ export testkey=testvalue

but according log simple test reads key fails error message key not set environment variable:

[test] public void testtravisenvvariable() {     string testkey= environment.getenvironmentvariable("testkey");      assert.isnotnullorempty(testkey, "key not set environment variable"); } 

the environment.getenvironmentvariable method reads variable of current process., apparently key can't read in case.

so how can read key?

update: not clear me why didn't work in first place sample above works second time ran build.

i tried on travis ci , environment.getenvironmentvariable("testkey"); works fine me in simple console app (specifyingenvironmentvariabletarget.user or .machine in overloads doesn't though).