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https://github.com/tesseract-ocr/tesseract.git
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120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
// (C) Copyright 2017, Google Inc.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "kdpair.h"
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#include "include_gunit.h"
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namespace tesseract {
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int test_data[] = {8, 1, 2, -4, 7, 9, 65536, 4, 9, 0, -32767, 6, 7};
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// The fixture for testing GenericHeap and DoublePtr.
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class NthItemTest : public testing::Test {
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protected:
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void SetUp() override {
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std::locale::global(std::locale(""));
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}
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public:
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~NthItemTest() override;
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// Pushes the test data onto the KDVector.
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void PushTestData(KDVector *v) {
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for (size_t i = 0; i < countof(test_data); ++i) {
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IntKDPair pair(test_data[i], i);
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v->push_back(pair);
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}
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}
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};
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// Destructor.
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// It is defined here, so the compiler can create a single vtable
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// instead of a weak vtable (fixes compiler warning).
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NthItemTest::~NthItemTest() = default;
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// Tests basic results.
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TEST_F(NthItemTest, GeneralTest) {
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KDVector v;
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// Push the test data onto the KDVector.
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PushTestData(&v);
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// Get the min item.
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size_t index = 0;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is -32767.
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EXPECT_EQ(-32767, v[index].key());
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// Get the max item.
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index = v.size() - 1;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 65536.
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EXPECT_EQ(65536, v[index].key());
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}
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// Tests results on boring data with lots of duplication.
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TEST_F(NthItemTest, BoringTest) {
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KDVector v;
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// Push the test data onto the KDVector.
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int test_data[] = {8, 8, 8, 8, 8, 7, 7, 7, 7};
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for (size_t i = 0; i < countof(test_data); ++i) {
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IntKDPair pair(test_data[i], i);
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v.push_back(pair);
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}
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// The 3rd item is 7 but the 4th is 8..
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size_t index = 3;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 7.
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EXPECT_EQ(7, v[index].key());
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index = 4;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 8.
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EXPECT_EQ(8, v[index].key());
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// Get the min item.
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index = 0;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 7.
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EXPECT_EQ(7, v[index].key());
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// Get the max item.
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index = v.size() - 1;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 8.
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EXPECT_EQ(8, v[index].key());
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}
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// Tests that a unique median in an odd-size array is found correctly.
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TEST_F(NthItemTest, UniqueTest) {
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KDVector v;
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// Push the test data onto the KDVector.
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PushTestData(&v);
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// Get the median item.
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size_t index = v.size() / 2;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 6, it started out at index 11.
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EXPECT_EQ(6, v[index].key());
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EXPECT_EQ(11, v[index].data());
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}
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// Tests that an equal median is found correctly.
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TEST_F(NthItemTest, EqualTest) {
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KDVector v;
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// Push the test data onto the KDVector.
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PushTestData(&v);
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// Add an extra 8. This makes the median 7.
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IntKDPair pair(8, 13);
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v.push_back(pair);
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// Get the median item.
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size_t index = v.size() / 2;
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std::nth_element(v.begin(), v.begin() + index, v.end());
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// The result is 7, it started out at index 4 or 12.
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EXPECT_EQ(7, v[index].key());
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EXPECT_TRUE(v[index].data() == 4 || v[index].data() == 12);
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}
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} // namespace tesseract
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