141   q_node* next;  member
159   for (q_node* q = &zero; q != nullptr; q = q->next) {  in TEST()
175   ASSERT_EQ(2, head->next->i);  in TEST()
176   ASSERT_EQ(nullptr, head->next->next);  in TEST()
180   ASSERT_EQ(nullptr, head->next);  in TEST()
186   zero.next = &zero;  in TEST()
193   ASSERT_EQ(1, head->next->i);  in TEST()
194   ASSERT_EQ(2, head->next->next->i);  in TEST()
195   ASSERT_EQ(0, head->next->next->next->i);  in TEST()
196   ASSERT_EQ(1, head->next->next->next->next->i);  in TEST()
197   ASSERT_EQ(2, head->next->next->next->next->next->i);  in TEST()
201   ASSERT_EQ(2, head->next->i);  in TEST()
202   ASSERT_EQ(0, head->next->next->i);  in TEST()
203   ASSERT_EQ(2, head->next->next->next->i);  in TEST()
207   ASSERT_EQ(0, head->next->i);  in TEST()