HackerRank Day 27 Solution In Python: Testing

Today we will see the HackerRank Day 27 Solution in Python. The problem is named Testing which is part of 30 Days of code on HackerRank. Let’s get started!

Day 27: Testing Problem statement

The problem statement given is about unit testing. We need to write 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.

We have to finish the implementation of 3 classes to provide data and expected results for the tests.

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

You can solve the problem h ere.

HackerRank Day 27 Solution in Python

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 seq[i] < seq[min_idx]:
            min_idx = i
    return min_idx
class TestDataEmptyArray():
    
    #Function to return an empty array
    def get_array():
        return []
        
class TestDataUniqueValues():
    
    #Function to return an array of size at least 2 with all unique elements
    def get_array():
        uniq_array = [1,2,3,4]
        return uniq_array
    
    #Function to return the expected minimum value index for this array
    def get_expected_result():
        return 0

class TestDataExactlyTwoDifferentMinimums:
    #Function to return an array where the minimum value occurs at exactly 2 indices
    def get_array():
        rtn_list = [0,2,0,3]
        return rtn_list
    
    #Function to  return the expected index
    def get_expected_result():
        return 0

def TestWithEmptyArray():
    try:
        seq = TestDataEmptyArray.get_array()
        result = minimum_index(seq)
    except ValueError as e:
        pass
    else:
        assert False


def TestWithUniqueValues():
    seq = TestDataUniqueValues.get_array()
    assert len(seq) >= 2

    assert len(list(set(seq))) == len(seq)

    expected_result = TestDataUniqueValues.get_expected_result()
    result = minimum_index(seq)
    assert result == expected_result


def TestiWithExactyTwoDifferentMinimums():
    seq = TestDataExactlyTwoDifferentMinimums.get_array()
    assert len(seq) >= 2
    tmp = sorted(seq)
    assert tmp[0] == tmp[1] and (len(tmp) == 2 or tmp[1] < tmp[2])

    expected_result = TestDataExactlyTwoDifferentMinimums.get_expected_result()
    result = minimum_index(seq)
    assert result == expected_result

TestWithEmptyArray()
TestWithUniqueValues()
TestiWithExactyTwoDifferentMinimums()
print("OK")

Code Explanation

First, we created the class TestDataEmptyArray, in which the method get_array() returns an empty array
Then we created the class TestDataUniqueValues in which get_array() returns an array of size at least 2 with all unique elements. The get_expected_result() method returns the expected minimum value index for this array
Then we created the class, in which get_array() returns an array where the minimum value occurs at exactly 2 indices. The get_expected_result() method returns the expected index

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