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-rw-r--r--xpcom/tests/gtest/TestPriorityQueue.cpp73
1 files changed, 73 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestPriorityQueue.cpp b/xpcom/tests/gtest/TestPriorityQueue.cpp
new file mode 100644
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+++ b/xpcom/tests/gtest/TestPriorityQueue.cpp
@@ -0,0 +1,73 @@
+/* -*- 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 "nsTPriorityQueue.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include "gtest/gtest.h"
+
+template <class T, class Compare>
+void CheckPopSequence(const nsTPriorityQueue<T, Compare>& aQueue,
+ const T* aExpectedSequence,
+ const uint32_t aSequenceLength) {
+ nsTPriorityQueue<T, Compare> copy = aQueue.Clone();
+
+ for (uint32_t i = 0; i < aSequenceLength; i++) {
+ EXPECT_FALSE(copy.IsEmpty());
+
+ T pop = copy.Pop();
+ EXPECT_EQ(pop, aExpectedSequence[i]);
+ }
+
+ EXPECT_TRUE(copy.IsEmpty());
+}
+
+template <class A>
+class MaxCompare {
+ public:
+ bool LessThan(const A& a, const A& b) { return a > b; }
+};
+
+TEST(PriorityQueue, Main)
+{
+ nsTPriorityQueue<int> queue;
+
+ EXPECT_TRUE(queue.IsEmpty());
+
+ queue.Push(8);
+ queue.Push(6);
+ queue.Push(4);
+ queue.Push(2);
+ queue.Push(10);
+ queue.Push(6);
+ EXPECT_EQ(queue.Top(), 2);
+ EXPECT_EQ(queue.Length(), 6u);
+ EXPECT_FALSE(queue.IsEmpty());
+ int expected[] = {2, 4, 6, 6, 8, 10};
+ CheckPopSequence(queue, expected, sizeof(expected) / sizeof(expected[0]));
+
+ // copy ctor is tested by using CheckPopSequence, but check default assignment
+ // operator
+ nsTPriorityQueue<int> queue2;
+ queue2 = queue.Clone();
+ CheckPopSequence(queue2, expected, sizeof(expected) / sizeof(expected[0]));
+
+ queue.Clear();
+ EXPECT_TRUE(queue.IsEmpty());
+
+ // try same sequence with a max heap
+ nsTPriorityQueue<int, MaxCompare<int> > max_queue;
+ max_queue.Push(8);
+ max_queue.Push(6);
+ max_queue.Push(4);
+ max_queue.Push(2);
+ max_queue.Push(10);
+ max_queue.Push(6);
+ EXPECT_EQ(max_queue.Top(), 10);
+ int expected_max[] = {10, 8, 6, 6, 4, 2};
+ CheckPopSequence(max_queue, expected_max,
+ sizeof(expected_max) / sizeof(expected_max[0]));
+}