test_that("Empty schedule is, well, an empty schedule.", {
schedule <- Schedule$new()
expect_error((schedule$nr_activities = 20))
expect_error((schedule$nr_relations = 20))
expect_error((schedule$has_any_activity = TRUE))
expect_error((schedule$has_any_relation = TRUE))
expect_equal(schedule$nr_activities, 0)
expect_equal(schedule$nr_relations, 0)
expect_false(schedule$has_any_activity)
expect_false(schedule$has_any_relation)
})
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