快速排序设计三组测试用例，用尽可能少的测试用例分别实现语句覆盖、分支覆盖、条件覆盖当中的一到两种。测试用例使用gtest或junit单元测试框架实现。

好的，我知道了。以下是三组测试用例的设计：

1. 语句覆盖

TEST(QuickSort, StatementCoverage) {
  int arr[] = {3, 1, 4, 2, 5};
  quickSort(arr, 0, 4);
  EXPECT_EQ(arr[0], 1);
  EXPECT_EQ(arr[1], 2);
  EXPECT_EQ(arr[2], 3);
  EXPECT_EQ(arr[3], 4);
  EXPECT_EQ(arr[4], 5);
}

2. 分支覆盖

TEST(QuickSort, BranchCoverage) {
  int arr[] = {3, 1, 4, 2, 5};
  quickSort(arr, 0, 4);
  if (arr[0] < arr[1]) {
    EXPECT_EQ(arr[0], 1);
    EXPECT_EQ(arr[1], 2);
  } else {
    EXPECT_EQ(arr[0], 2);
    EXPECT_EQ(arr[1], 1);
  }
  if (arr[2] < arr[3]) {
    EXPECT_EQ(arr[2], 3);
    EXPECT_EQ(arr[3], 4);
  } else {
    EXPECT_EQ(arr[2], 4);
    EXPECT_EQ(arr[3], 3);
  }
  EXPECT_EQ(arr[4], 5);
}

3. 条件覆盖

TEST(QuickSort, ConditionCoverage) {
  int arr[] = {3, 1, 4, 2, 5};
  quickSort(arr, 0, 4);
  if (arr[0] < arr[1]) {
    EXPECT_EQ(arr[0], 1);
    EXPECT_EQ(arr[1], 2);
  } else if (arr[0] > arr[1]) {
    EXPECT_EQ(arr[0], 2);
    EXPECT_EQ(arr[1], 1);
  } else {
    EXPECT_EQ(arr[0], 1);
    EXPECT_EQ(arr[1], 2);
  }
  if (arr[2] < arr[3]) {
    EXPECT_EQ(arr[2], 3);
    EXPECT_EQ(arr[3], 4);
  } else if (arr[2] > arr[3]) {
    EXPECT_EQ(arr[2], 4);
    EXPECT_EQ(arr[3], 3);
  } else {
    EXPECT_EQ(arr[2], 3);
    EXPECT_EQ(arr[3], 4);
  }
  EXPECT_EQ(arr[4], 5);
}

以上三组测试用例分别实现了语句覆盖、分支覆盖、条件覆盖中的一种或多种。测试用例使用了gtest单元测试框架。