add some tests for Calendar.coffee
add some tests for Calendar.coffee

closes CNVS-32495

test plan:
- none, specs

Change-Id: Ic8d204bd6d2c6a4361fed5d4fcddfc824618c4f9
Reviewed-on: https://gerrit.instructure.com/92209
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
Product-Review: Jon Willesen <0321efbc0acf6204eb6035acb1d418838b450d08@instructure.com>
QA-Review: Jon Willesen <0321efbc0acf6204eb6035acb1d418838b450d08@instructure.com>

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