Test existance and value of MOCHA_REPORTER_JUNIT during test runs (#1912)

Resolves issue #1911

Author: d3r3kk

src/test/constants.ts

@@ -10,9 +10,15 @@ export const IS_VSTS = process.env.TF_BUILD !== undefined;
 export const IS_CI_SERVER = IS_TRAVIS || IS_APPVEYOR || IS_VSTS;
 
 // allow the CI server to specify JUnit output...
-export const MOCHA_REPORTER_JUNIT: boolean = IS_CI_SERVER && process.env.MOCHA_REPORTER_JUNIT !== undefined;
-export const MOCHA_CI_REPORTFILE: string = MOCHA_REPORTER_JUNIT && process.env.MOCHA_CI_REPORTFILE !== undefined ? process.env.MOCHA_CI_REPORTFILE.toString() : './junit-out.xml';
-export const MOCHA_CI_PROPERTIES: string = MOCHA_REPORTER_JUNIT && process.env.MOCHA_CI_PROPERTIES !== undefined ? process.env.MOCHA_CI_PROPERTIES.toString() : '';
+let reportJunit: boolean = false;
+if (IS_CI_SERVER && process.env.MOCHA_REPORTER_JUNIT !== undefined) {
+    reportJunit = process.env.MOCHA_REPORTER_JUNIT.toLowerCase() === 'true';
+}
+export const MOCHA_REPORTER_JUNIT: boolean = reportJunit;
+export const MOCHA_CI_REPORTFILE: string = MOCHA_REPORTER_JUNIT && process.env.MOCHA_CI_REPORTFILE !== undefined ?
+                                            process.env.MOCHA_CI_REPORTFILE : './junit-out.xml';
+export const MOCHA_CI_PROPERTIES: string = MOCHA_REPORTER_JUNIT && process.env.MOCHA_CI_PROPERTIES !== undefined ?
+                                            process.env.MOCHA_CI_PROPERTIES : '';
 
 export const TEST_TIMEOUT = 25000;
 export const IS_MULTI_ROOT_TEST = isMultitrootTest();