day27.py

"""
This problem is all about unit testing.

Your company needs a function that meets the following requirements:

For a given array of  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, the returned index should be the smallest one.
If an empty array is passed to the function, it should raise an Exception.
Note: The arrays are indexed from .

Another co-worker has prepared functions that will perform the testing and validate returned results with expectations. Your task is to implement  classes that will produce test data and the expected results for the testing functions. More specifically: function get_array() in TestDataEmptyArray class and functions get_array() and get_expected_result() in classes TestDataUniqueValues and TestDataExactlyTwoDifferentMinimums following the below specifications:

get_array() method in class TestDataEmptyArray has to return an empty array.
get_array() method in class TestDataUniqueValues has to return an array of size at least 2 with all unique elements, while method get_expected_result() of this class has to return the expected minimum value index for this array.
get_array() method in class TestDataExactlyTwoDifferentMinimums has to return an array where there are exactly two different minimum values, while method get_expected_result() of this class has to return the expected minimum value index for this array.
Take a look at the code template to see the exact implementation of functions that your colleagues already implemented.
"""
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(object):
    
    @staticmethod
    def get_array():
        # complete this function
        return []

class TestDataUniqueValues(object):

    @staticmethod
    def get_array():
        # complete this function
        return [2,1,3,4]

    @staticmethod
    def get_expected_result():
        # complete this function
        return 1

class TestDataExactlyTwoDifferentMinimums(object):

    @staticmethod
    def get_array():
        # complete this function
        return [2,1,3,1,5]

    @staticmethod
    def get_expected_result():
        # complete this function
        return 1


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")