Environment variables for e2e tests

[gus-costa]

No description provided.

[gus-costa]

Hi @sah2ed , thanks for your help. The changes you requested are done.
Let me know if you need something else.

[sah2ed]

Prior to the start of the tests, there should be a check like:

if (testUser == null || testPassword == null) {
// print out warning explaining that tests will fail unless TEST_USER and TEST_PASSWORD environment variables are set.
}

[sah2ed]

@GSTVAC

I ran the build now without setting the env variables and it wasn't easily apparent why the tests failed on CircleCI.

It was clearly stated in Requirement 2.2.1 that "If either variable is unset, the tests should fail hinting that they must be set for the tests to run."

Please see my review remark above on how to remedy the issue: https://github.com/topcoder-platform/admin-app/pull/65/files#diff-f1b7e32bde00048fe7a9882a0fbaa700R6

[gus-costa]

@sah2ed
I agree with you. The message gets lost in the middle of the stack traces.
I decided to throw an exception to make the message more clear. Is it good like this or do you prefer to show just a warning?

[gus-costa]

I submitted another PR with these changes. #66