Fixes in methods and tests in Linear Algebra (TheAlgorithms#1432)

* Fixes in methods and tests

* Renamed tests.py to test_linear_algebra.py

* removed force_test()

* Delete test_linear_algebra.py

* Format code with psf/black

* Rename tests.py to test_linear_algebra.py

Author: codecalec

linear_algebra/src/lib.py

@@ -119,7 +119,7 @@ def __sub__(self, other):
         size = len(self)
         if size == len(other):
             result = [self.__components[i] - other.component(i) for i in range(size)]
-            return result
+            return Vector(result)
         else:  # error case
             raise Exception("must have the same size")
 
@@ -130,7 +130,7 @@ def __mul__(self, other):
         """
         if isinstance(other, float) or isinstance(other, int):
             ans = [c * other for c in self.__components]
-            return ans
+            return Vector(ans)
         elif isinstance(other, Vector) and (len(self) == len(other)):
             size = len(self)
             summe = 0

linear_algebra/src/tests.py renamed to linear_algebra/src/test_linear_algebra.py

@@ -45,7 +45,7 @@ def test_euclidLength(self):
             test for the eulidean length
         """
         x = Vector([1, 2])
-        self.assertAlmostEqual(x.eulidLength(), 2.236, 3)
+        self.assertAlmostEqual(x.euclidLength(), 2.236, 3)
 
     def test_add(self):
         """
@@ -156,13 +156,6 @@ def test_squareZeroMatrix(self):
             str(squareZeroMatrix(5)),
         )
 
-def force_test() -> None:
-    """
-    This will ensure that pytest runs the unit tests above.
-    To explore https://github.com/TheAlgorithms/Python/pull/1124 uncomment the line below.
-    >>> # unittest.main()
-    """
-    pass
-    
+
 if __name__ == "__main__":
     unittest.main()