Add matrix mult challenge

recursion_dynamic/matrix_mult/test_find_min_cost.py

@@ -0,0 +1,25 @@
+from nose.tools import assert_equal, assert_raises
+
+
+class TestMatrixMultiplicationCost(object):
+
+    def test_find_min_cost(self):
+        matrix_mult_cost = MatrixMultiplicationCost()
+        assert_raises(TypeError, matrix_mult_cost.find_min_cost, None)
+        assert_equal(matrix_mult_cost.find_min_cost([]), 0)
+        matrices = [Matrix(2, 3),
+                    Matrix(3, 6),
+                    Matrix(6, 4),
+                    Matrix(4, 5)]
+        expected_cost = 124
+        assert_equal(matrix_mult_cost.find_min_cost(matrices), expected_cost)
+        print('Success: test_find_min_cost')
+
+
+def main():
+    test = TestMatrixMultiplicationCost()
+    test.test_find_min_cost()
+
+
+if __name__ == '__main__':
+    main()