Day 27 Testing Hackerrank Solution In C++

Day 27 Testing Hackerrank Solution In C++, This problem is about unit testing. Your company needs a function that meets the following requirements. For a given array of n integers, the function returns the index of the element with the minimum value in the array. If there is more than one element with the minimum value, it returns the smallest one.

If an empty array is passed to the function, it raises an exception. A colleague has written this method. The implementation in Python is listed below. Implementations in other languages can be found in the code template.

def minimum_index(seq):
    if len(seq) == 0:
        raise ValueError("Cannot get the minimum value index from an empty sequence")
    min_idx = 0
    for i in range(1, len(seq)):
        if a[i] < a[min_idx]:
            min_idx = i
    return min_idx

A coworker has prepared functions that will perform the tests and validate return values. Finish the implementation of 3 classes to provide data and expected results for the tests.

Complete the following methods.

In the class TestDataEmptyArray:

get_array() returns an empty array

In the class TestDataUniqueValues:

get_array() returns an array of size at least 2 with all unique elements

get_expected_result() returns the expected minimum value index for this array

In the class TestDataExactlyTwoDifferentMinimums:

get_array() returns an array where the minimum value occurs at exactly 2 indices

get_expected_result() returns the expected index

Take a look at the code template to see the exact implementation of functions that your colleague already implemented.

Note: The arrays are indexed from 0.

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Day 27 Testing Hackerrank Solution In C++

#include <algorithm>
#include <iostream>
#include <stdexcept>
#include <vector>
#include <cassert>
#include <set>

using namespace std;

int minimum_index(vector<int> seq) {
    if (seq.empty()) {
        throw invalid_argument("Cannot get the minimum value index from an empty sequence");
    }
    int min_idx = 0;
    for (int i = 1; i < seq.size(); ++i) {
        if (seq[i] < seq[min_idx]) {
            min_idx = i;
        }
    }
    return min_idx;
}

/* Code Start from here Day 27 Testing Hackerrank Solution In C++ */
class TestDataEmptyArray{
public:
    static vector<int> get_array() { 
    //static is used to make the function independent of the object
    //get_array() can now be called without creating any object
        vector<int> arr{};
        return arr;
    }
};

class TestDataUniqueValues{
public:
    static vector<int> get_array() {
        vector<int> arr{3,2,4,1};
        return arr;
    }
    
    static int get_expected_result() {
        return 3;
        //3rd index contains the min value.
    }
};

class TestDataExactlyTwoDifferentMinimums{
public:
    static vector<int> get_array() { 
        vector<int> arr {2,2,1,1,3}; 
        // array with two more than 1 elements as min. 
        // First occurence of min element at 2nd index.
        return arr;
    }
    
    static int get_expected_result() {
        return 2; 
        // 2nd index i.e 3rd element of above array is the minimum.
    }
};

/* Code End from here Day 27 Testing Hackerrank Solution In C++ */

void TestWithEmptyArray() {
    try {
        auto seq = TestDataEmptyArray::get_array();
        auto result = minimum_index(seq);
    } catch (invalid_argument& e) {
        return;
    }
    assert(false);
}

void TestWithUniqueValues() {
    auto seq = TestDataUniqueValues::get_array();
    assert(seq.size() >= 2);

    assert(set<int>(seq.begin(), seq.end()).size() == seq.size());

    auto expected_result = TestDataUniqueValues::get_expected_result();
    auto result = minimum_index(seq);
    assert(result == expected_result);
}

void TestWithExactlyTwoDifferentMinimums() {
    auto seq = TestDataExactlyTwoDifferentMinimums::get_array();
    assert(seq.size() >= 2);

    auto tmp = seq;
    sort(tmp.begin(), tmp.end());
    assert(tmp[0] == tmp[1] and (tmp.size() == 2 or tmp[1] < tmp[2]));

    auto expected_result = TestDataExactlyTwoDifferentMinimums::get_expected_result();
    auto result = minimum_index(seq);
    assert(result == expected_result);
}

int main() {
    TestWithEmptyArray();
    TestWithUniqueValues();
    TestWithExactlyTwoDifferentMinimums();
    cout << "OK" << endl;
    return 0;
}