#8543: EmptySet is Back ! TestSuite should allows for empty sets.
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Reporter: hivert | Owner: hivert
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.4
Component: categories | Keywords: empty set, Testsuite,
EmptySetError
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by hivert):
* keywords: empty set, Testsuite => empty set, Testsuite, EmptySetError
* status: new => needs_review
Old description:
> There is currently no way to have an empty set which pass the category
> tests. Indeed the current specification says: for any set {{{S}}} there
> must be a method {{{S.an_element()}}} which returns an actual element
> {{{x}}} such that {{{x in S}}}:
> {{{
> an_element = self.an_element()
> tester.assert_(an_element in self, "self.an_element() is not in self")
> }}}
> This tests should allows {{{S}}} to be empty.
New description:
There is currently no way to have an empty set which pass the category
tests. Indeed the current specification says: for any set {{{S}}} there
must be a method {{{S.an_element()}}} which returns an actual element
{{{x}}} such that {{{x in S}}}:
{{{
an_element = self.an_element()
tester.assert_(an_element in self, "self.an_element() is not in self")
}}}
This tests should allows {{{S}}} to be empty.
To solve this issue I added a new exception called {{{EmptySetError}}}
which should be raised in such cases. I fixed the tests suite of the
category {{{Sets()}}} accordingly and expanded the test in some places
where this could be done before.
Depends on #8519
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8543#comment:1>
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