unittest jsut runs 1 out of 4 test cases

Question

We have this assigment where i should run these four test cases with the help of unittest but when I run it with the command python test.py (name of the file) it just says it ran 1 test what am I doing wrong?

import sympy as sp
import numpy as np
from scipy import linalg
def numpy_determinant(arr):
    if len(sp.Matrix(arr).rref()[1]) < max(np.shape(arr)):
        return 0
    else:
        return np.linalg.det(arr)

def scipy_determinant(arr):
    return linalg.det(arr)

class ArrValue:
    value = np.array([[2, 1],
                      [2, 2]])

class TestMethods(unittest.TestCase):
    def test_positive(self):
        # test case 1
        arr1 = ArrValue()
        arr_det_np = numpy_determinant(arr1.value)
        arr2 = ArrValue()
        arr_det_sc = scipy_determinant(arr2.value)

        # Test case 2
        arr1 = ArrValue()
        arr_det_np = numpy_determinant(arr1.value)
        arr2 = np.array([[2, 1, 0],
                         [2, 2, 0]])
        arr_det_sc = scipy_determinant(arr2)

        # test case 3
        arr1 = ArrValue()
        arr_det_np = numpy_determinant(arr1.value)
        arr2 = np.linalg.inv(arr1)
        arr_det_sc = scipy_determinant(arr2.value)

        # test case 4
        arr1 = ArrValue()
        arr_det_np = numpy_determinant(arr1.value)
        arr2 = np.linalg.transpose(arr1)
        arr_det_sc = scipy_determinant(arr2.value)

        #test case 5
        arr1 = ([[1,0,0],
                 [0,0,0],
                 [0,0,1]])
        arr_det_np = numpy_determinant(arr1)
        arr2 = ArrValue()
        arr_det_sc = scipy_determinant(arr2.value)