Bug 1212624 - Tests for LinkedList, r=Waldo

mfbt/tests/TestLinkedList.cpp

@@ -0,0 +1,147 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Assertions.h"
+#include "mozilla/LinkedList.h"
+
+using mozilla::LinkedList;
+using mozilla::LinkedListElement;
+
+struct SomeClass : public LinkedListElement<SomeClass> {
+  unsigned int mValue;
+  explicit SomeClass(int aValue) : mValue(aValue) {}
+  void incr() { ++mValue; }
+};
+
+struct PrivateClass : private LinkedListElement<PrivateClass> {
+  friend class LinkedList<PrivateClass>;
+  friend class LinkedListElement<PrivateClass>;
+};
+
+template <size_t N>
+static void
+CheckListValues(LinkedList<SomeClass>& list, unsigned int (&values)[N])
+{
+  size_t count = 0;
+  for (SomeClass* x : list) {
+    MOZ_RELEASE_ASSERT(x->mValue == values[count]);
+    ++count;
+  }
+  MOZ_RELEASE_ASSERT(count == N);
+}
+
+static void
+TestList()
+{
+  LinkedList<SomeClass> list;
+
+  SomeClass one(1), two(2), three(3);
+  
+  MOZ_RELEASE_ASSERT(list.isEmpty());
+  MOZ_RELEASE_ASSERT(!list.getFirst());
+  MOZ_RELEASE_ASSERT(!list.getLast());
+  MOZ_RELEASE_ASSERT(!list.popFirst());
+  MOZ_RELEASE_ASSERT(!list.popLast());
+
+  for (SomeClass* x : list) {
+    MOZ_RELEASE_ASSERT(x);
+    MOZ_RELEASE_ASSERT(false);
+  }
+
+  list.insertFront(&one);
+  { unsigned int check[] { 1 }; CheckListValues(list, check); }
+
+  MOZ_RELEASE_ASSERT(one.isInList());
+  MOZ_RELEASE_ASSERT(!two.isInList());
+  MOZ_RELEASE_ASSERT(!three.isInList());
+  
+  MOZ_RELEASE_ASSERT(!list.isEmpty());
+  MOZ_RELEASE_ASSERT(list.getFirst()->mValue == 1);
+  MOZ_RELEASE_ASSERT(list.getLast()->mValue == 1);
+
+  list.insertFront(&two);
+  { unsigned int check[] { 2, 1 }; CheckListValues(list, check); }
+
+  MOZ_RELEASE_ASSERT(list.getFirst()->mValue == 2);
+  MOZ_RELEASE_ASSERT(list.getLast()->mValue == 1);
+
+  list.insertBack(&three);
+  { unsigned int check[] { 2, 1, 3 }; CheckListValues(list, check); }
+
+  MOZ_RELEASE_ASSERT(list.getFirst()->mValue == 2);
+  MOZ_RELEASE_ASSERT(list.getLast()->mValue == 3);
+
+  one.removeFrom(list);
+  { unsigned int check[] { 2, 3 }; CheckListValues(list, check); }
+
+  three.setPrevious(&one);
+  { unsigned int check[] { 2, 1, 3 }; CheckListValues(list, check); }
+
+  three.removeFrom(list);
+  { unsigned int check[] { 2, 1 }; CheckListValues(list, check); }
+
+  two.setPrevious(&three);
+  { unsigned int check[] { 3, 2, 1 }; CheckListValues(list, check); }
+
+  three.removeFrom(list);
+  { unsigned int check[] { 2, 1 }; CheckListValues(list, check); }
+
+  two.setNext(&three);
+  { unsigned int check[] { 2, 3, 1 }; CheckListValues(list, check); }
+
+  one.remove();
+  { unsigned int check[] { 2, 3 }; CheckListValues(list, check); }
+
+  two.remove();
+  { unsigned int check[] { 3 }; CheckListValues(list, check); }
+
+  three.setPrevious(&two);
+  { unsigned int check[] { 2, 3 }; CheckListValues(list, check); }
+
+  three.remove();
+  { unsigned int check[] { 2 }; CheckListValues(list, check); }
+
+  two.remove();
+
+  list.insertBack(&three);
+  { unsigned int check[] { 3 }; CheckListValues(list, check); }
+
+  list.insertFront(&two);
+  { unsigned int check[] { 2, 3 }; CheckListValues(list, check); }
+
+  for (SomeClass* x : list) {
+    x->incr();
+  }
+
+  MOZ_RELEASE_ASSERT(list.getFirst() == &two);
+  MOZ_RELEASE_ASSERT(list.getLast() == &three);
+  MOZ_RELEASE_ASSERT(list.getFirst()->mValue == 3);
+  MOZ_RELEASE_ASSERT(list.getLast()->mValue == 4);
+}
+
+static void
+TestPrivate()
+{
+  LinkedList<PrivateClass> list;
+  PrivateClass one, two;
+  list.insertBack(&one);
+  list.insertBack(&two);
+
+  size_t count = 0;
+  for (PrivateClass* p : list) {
+    MOZ_RELEASE_ASSERT(p, "cannot have null elements in list");
+    count++;
+  }
+  MOZ_RELEASE_ASSERT(count == 2);
+}
+
+int
+main()
+{
+  TestList();
+  TestPrivate();
+  return 0;
+}

mfbt/tests/moz.build

@@ -22,6 +22,7 @@ CppUnitTests([
     'TestIntegerPrintfMacros',
     'TestIntegerRange',
     'TestJSONWriter',
+    'TestLinkedList',
     'TestMacroArgs',
     'TestMacroForEach',
     'TestMathAlgorithms',