Travis.ci environment variables not readable in phpunit

Can someone help me understand why my environment variables are not being read inside my phpunit test from travis.ci?

So I'm trying to write automated testing with travis for a php / javascript application I'm working on. However, when I wrote a test to check the environment variables reading in phpunit from travis, they fail. This means (as far as I can tell) that either the environment variables cannot be read by phpunit, or they do not pass properly into the travis test.

.travis.yml

language: php
php:
  - '7.0'
  - '7.1'

before_install:
  - echo "extension=ldap.so" >>php --ini | grep "Loaded Configuration" | sed -e "s|.:\s||"``

install:
  - cd test
  - npm install
  - cd ..

script:
  - echo $API_BASE_URL
  - phpunit test/build_tests.php

notifications:
    on_success: never
    on_failure: never

      

        
        
        
      

    

Phpunit file

<?php

use PHPUnit\Framework\TestCase;

class build_tests extends TestCase
{
    public function testForEnv()
    {
        $this->assertEquals(isset($_ENV['API_BASE_URL']), true);
        $this->assertEquals(isset($_ENV['DRINK_SERVER_URL']), true);
        $this->assertEquals(isset($_ENV['LOCAL_DRINK_SERVER_URL']), true);
        $this->assertEquals(isset($_ENV['RATE_LIMIT_DROPS_DROP']), true);
        $this->assertEquals(isset($_ENV['DEBUG']), true);
        $this->assertEquals(isset($_ENV['DEBUG_USER_UID']), true);
        $this->assertEquals(isset($_ENV['DEBUG_USER_CN']), true);
        $this->assertEquals(isset($_ENV['USE_LOCAL_DRINK_SERVER']), true);
    }
}

?>

      

        
        
        
      

    

travis Export environment variables

$ Setting environment variables from repository settings
$ export DRINK_SERVER_URL=https://drink.csh.rit.edu:8080
$ export LOCAL_DRINK_SERVER_URL=http://localhost:3000
$ export RATE_LIMIT_DROPS_DROP=3
$ export DEBUG=true
$ export DEBUG_USER_UID=[secure]
$ export DEBUG_USER_CN=[secure]
$ export USE_LOCAL_DRINK_SERVER=true
$ export API_BASE_URL='api/index.php?request='

      

        
        
        
      

    

phpunit Result

PHPUnit 6.1.1 by Sebastian Bergmann and contributors. 

F                                                                   1 / 1 (100%)

Time: 260 ms, Memory: 6.00MB 

There was 1 failure:

1) build_tests::testForEnv

Failed asserting that true matches expected false. 

/home/travis/build/devinmatte/WebDrink-2.0/test/build_tests.php:9

FAILURES!

Tests: 1, Assertions: 1, Failures: 1.

      

        
        
        
      

    

Can someone help me understand why my environment variables are not being read inside my phpunit test? I would be very grateful.