If you're in the middle of taking a Test when your computer or Web browser crashes:
All questions that were saved should be there. Typically you can simply continue where you left off, though your instructor controls the Test settings which specify whether you will be able to continue or not.
If your instructor has set your test to "Force Completion" you must contact your instructor immediately to notify him/her of the issues you had, and for them to reset or reopen the test.
Tests are not visible in WTClass until the time they become "available" to take. Your instructor will need to tell you when that is.
Also note, your instructor may post your Test to any course content area within your course. Look through each folder and menu item to be sure it has not been posted. Then contact your instructor for further directions.