func (stringSetSuite) TestUninitialized(c *C) {
var uninitialized set.Strings
c.Assert(uninitialized.Size(), Equals, 0)
c.Assert(uninitialized.IsEmpty(), Equals, true)
// You can get values and sorted values from an unitialized set.
AssertValues(c, uninitialized)
// All contains checks are false
c.Assert(uninitialized.Contains("foo"), Equals, false)
// Remove works on an uninitialized Strings
uninitialized.Remove("foo")
var other set.Strings
// Union returns a new set that is empty but initialized.
c.Assert(uninitialized.Union(other), DeepEquals, set.NewStrings())
c.Assert(uninitialized.Intersection(other), DeepEquals, set.NewStrings())
c.Assert(uninitialized.Difference(other), DeepEquals, set.NewStrings())
other = set.NewStrings("foo", "bar")
c.Assert(uninitialized.Union(other), DeepEquals, other)
c.Assert(uninitialized.Intersection(other), DeepEquals, set.NewStrings())
c.Assert(uninitialized.Difference(other), DeepEquals, set.NewStrings())
c.Assert(other.Union(uninitialized), DeepEquals, other)
c.Assert(other.Intersection(uninitialized), DeepEquals, set.NewStrings())
c.Assert(other.Difference(uninitialized), DeepEquals, other)
// Once something is added, the set becomes initialized.
uninitialized.Add("foo")
AssertValues(c, uninitialized, "foo")
}
// Helper methods for the tests.
func AssertValues(c *C, s set.Strings, expected ...string) {
values := s.Values()
// Expect an empty slice, not a nil slice for values.
if expected == nil {
expected = []string{}
}
sort.Strings(expected)
sort.Strings(values)
c.Assert(values, DeepEquals, expected)
c.Assert(s.Size(), Equals, len(expected))
// Check the sorted values too.
sorted := s.SortedValues()
c.Assert(sorted, DeepEquals, expected)
}