Updated the test system

test/isTravisCI.test.js

@@ -0,0 +1,14 @@
+const expect = require('expect');
+const {isTravisCI} = require('./_30s.js');
+
+test('isTravisCI is a Function', () => {
+  expect(isTravisCI).toBeInstanceOf(Function);
+});
+if (isTravisCI())
+  test('Running on Travis, correctly evaluates', () => {
+    expect(isTravisCI()).toBeTruthy();
+  });
+else
+  test('Not running on Travis, correctly evaluates', () => {
+    expect(isTravisCI()).toBeFalsy();
+  });