public void Malformed_Weird() { var empty = new EmptyEnumerable <int>(); var emptyOrdered = new EmptyOrderedEnumerable <int>(); var groupByDefault = new GroupByDefaultEnumerable <int, int, int, EmptyEnumerable <int>, EmptyEnumerator <int> >(); var groupBySpecific = new GroupBySpecificEnumerable <int, int, int, EmptyEnumerable <int>, EmptyEnumerator <int> >(); var lookupDefault = new LookupDefaultEnumerable <int, int>(); var lookupSpecific = new LookupSpecificEnumerable <int, int>(); var range = new RangeEnumerable(); var repeat = new RepeatEnumerable <int>(); var reverseRange = new ReverseRangeEnumerable(); var oneItemDefault = new OneItemDefaultEnumerable <int>(); var oneItemSpecific = new OneItemSpecificEnumerable <int>(); var oneItemDefaultOrdered = new OneItemDefaultOrderedEnumerable <int>(); var oneItemSpecificOrdered = new OneItemSpecificOrderedEnumerable <int>(); // empty { try { empty.Single(); Assert.Fail(); }catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { empty.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { empty.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { empty.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // emptyOrdered { try { emptyOrdered.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { emptyOrdered.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { emptyOrdered.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { emptyOrdered.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // groupByDefault { try { groupByDefault.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { groupByDefault.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { groupByDefault.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { groupByDefault.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // groupBySpecific { try { groupBySpecific.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { groupBySpecific.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { groupBySpecific.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { groupBySpecific.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // lookupDefault { try { lookupDefault.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { lookupDefault.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { lookupDefault.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { lookupDefault.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // lookupSpecific { try { lookupSpecific.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { lookupSpecific.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { lookupSpecific.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { lookupSpecific.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // range { try { range.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { range.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { range.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { range.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // repeat { try { repeat.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { repeat.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { repeat.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { repeat.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // reverseRange { try { reverseRange.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { reverseRange.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { reverseRange.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { reverseRange.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // oneItemDefault { try { oneItemDefault.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemDefault.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemDefault.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemDefault.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // oneItemSpecific { try { oneItemSpecific.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemSpecific.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemSpecific.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemSpecific.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // oneItemDefaultOrdered { try { oneItemDefaultOrdered.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemDefaultOrdered.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemDefaultOrdered.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemDefaultOrdered.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } // oneItemSpecificOrdered { try { oneItemSpecificOrdered.Single(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemSpecificOrdered.Single(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemSpecificOrdered.SingleOrDefault(); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } try { oneItemSpecificOrdered.SingleOrDefault(x => true); Assert.Fail(); } catch (ArgumentException exc) { Assert.AreEqual("source", exc.ParamName); } } }